Chemistry - A European Journal

Cover image for Vol. 17 Issue 16

Special Issue: Women in Chemistry

April 11, 2011

Volume 17, Issue 16

Pages 4333–4660

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Inside Cover
    4. Editorial
    5. Graphical Abstract
    6. News
    7. Communications
    8. Full Papers
    9. Preview
    10. Back Cover
    1. Cover Picture: Highly Efficient Visible-Light Driven Photochromism: Developments towards a Solid-State Molecular Switch Operating through a Triplet-Sensitised Pathway (Chem. Eur. J. 16/2011) (page 4333)

      Dr. Simon K. Brayshaw, Stephanie Schiffers, Anna J. Stevenson, Dr. Simon J. Teat, Mark R. Warren, Robert D. Bennett, Dr. Igor V. Sazanovich, Dr. Alastair R. Buckley, Dr. Julia A. Weinstein and Prof. Dr. Paul R. Raithby

      Article first published online: 1 APR 2011 | DOI: 10.1002/chem.201190076

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      A visible-light driven highly efficient molecular photoswitch is presented, which operates through a triplet-sensitized pathway owing to the presence of two PtII centres decorating one diarylethene unit. A combination of X-ray crystallography, transient absorption, and resonance Raman spectroscopy have revealed the properties of the photoswitch in solution, thin film, powder, and in a single crystal. For more details see the Full Paper by J. A. Weinstein, P. R. Raithby et al. on page 4385 ff.

  2. Inside Cover

    1. Top of page
    2. Cover Picture
    3. Inside Cover
    4. Editorial
    5. Graphical Abstract
    6. News
    7. Communications
    8. Full Papers
    9. Preview
    10. Back Cover
    1. Inside Cover: The Synthesis and Properties of Free-Base [14]Triphyrin(2.1.1) Compounds and the Formation of Subporphyrinoid Metal Complexes (Chem. Eur. J. 16/2011) (page 4334)

      Dr. Zhao Li Xue, Dr. John Mack, Dr. Hua Lu, Lei Zhang, Prof. Xiao Zeng You, Daiki Kuzuhara, Prof. Martin Stillman, Prof. Hiroko Yamada, Prof. Seigo Yamauchi, Prof. Nagao Kobayashi and Prof. Zhen Shen

      Article first published online: 1 APR 2011 | DOI: 10.1002/chem.201190077

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      A series of free-base [14]triphyrin(2.1.1) compounds have been prepared in yields up to 35 % based on a modified Lindsey method. The use of BF3⋅OEt2 as a catalyst and its concentration relative to the pyrrole and aldehyde precursors are critical factors in [14]triphyrin(2.1.1) formation. Retro-Diels–Alder reactions were used to prepare [14]tribenzotriphyrin(2.1.1) and [14]trinaphthotriphyrin(2.1.1) compounds. For more details see the Full Paper by Z. Shen, H. Yamada, N. Kobayashi et al. on page 4396 ff.

  3. Editorial

    1. Top of page
    2. Cover Picture
    3. Inside Cover
    4. Editorial
    5. Graphical Abstract
    6. News
    7. Communications
    8. Full Papers
    9. Preview
    10. Back Cover
    1. Women in Chemistry

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      Women in Chemistry (pages 4336–4339)

      Deveson Anne

      Article first published online: 1 APR 2011 | DOI: 10.1002/chem.201100775

  4. Graphical Abstract

    1. Top of page
    2. Cover Picture
    3. Inside Cover
    4. Editorial
    5. Graphical Abstract
    6. News
    7. Communications
    8. Full Papers
    9. Preview
    10. Back Cover
  5. News

    1. Top of page
    2. Cover Picture
    3. Inside Cover
    4. Editorial
    5. Graphical Abstract
    6. News
    7. Communications
    8. Full Papers
    9. Preview
    10. Back Cover
  6. Communications

    1. Top of page
    2. Cover Picture
    3. Inside Cover
    4. Editorial
    5. Graphical Abstract
    6. News
    7. Communications
    8. Full Papers
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    10. Back Cover
    1. Catalyst Support

      Surface and Inner Defects in Au/CeO2 WGS Catalysts: Relation between Raman Properties, Reactivity and Morphology (pages 4356–4361)

      Dr. Floriana Vindigni, Dr. Maela Manzoli, Dr. Alessandro Damin, Prof. Dr. Tatyana Tabakova and Prof. Dr. Adriano Zecchina

      Article first published online: 17 JAN 2011 | DOI: 10.1002/chem.201003214

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      Defects (O vacancies) with different Raman properties (A–C, see graphic) and reactivity are present on Au/CeO2. A is Raman inactive, located in external layers, able to form O22− species with O2; B, formed by a Au-catalysed reduction in H2, is Raman active, located in non-stoichiometric surface layer, and reacts with O2 without forming O22− species; C is Raman active, located in inner positions, and gives negligible reactivity upon O2. Only A and B defects react with H2O.

    2. Single-Molecule Magnets

      A Non-sandwiched Macrocyclic Monolanthanide Single-Molecule Magnet: The Key Role of Axiality (pages 4362–4365)

      Humphrey L. C. Feltham, Dr. Yanhua Lan, Frederik Klöwer , Liviu Ungur, Prof. Liviu F. Chibotaru, Prof. Annie K. Powell and Prof. Sally Brooker

      Article first published online: 22 MAR 2011 | DOI: 10.1002/chem.201100438

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      Macrocyclic single-molecule magnet: The dynamic behavior of the tetranuclear zinc(II)–dysprosium(III) complex of the hexaimine [3+3] macrocycle (LPr)6− under an external DC field (1500 Oe) indicates that it is a single-molecule magnet (SMM). It is the first to contain a single lanthanide ion (in orange, see graphic) coordinated inside the cavity of a single macrocyclic ligand and thus represents a new class of SMM.

    3. Polynuclear Coordination Clusters

      Combined Use of Magnetic Susceptibility Measurements and 57Fe Mössbauer Spectroscopy To Determine the Magnetic Ground State of an FeIII16 Cluster (pages 4366–4370)

      Dr. Ayuk M. Ako, Dr. Valeriu Mereacre, Dr. Yanhua Lan, Dr. Christopher E. Anson and Prof. Dr. Annie K. Powell

      Article first published online: 17 FEB 2011 | DOI: 10.1002/chem.201003574

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      A novel core topology is displayed by a new FeIII16 cluster; the magnetic ground state (see picture) of which was determined by magnetic studies and Mössbauer spectroscopy.

    4. Organotin Sulfide Cages

      Controlling the Architecture of Discrete Organotin Sulfide Molecules by Optimization of the Intramolecular Spacer Length (pages 4371–4374)

      Dr. Mohammad Reza Halvagar, Dr. Zohreh Hassanzadeh Fard and Prof. Dr. Stefanie Dehnen

      Article first published online: 23 FEB 2011 | DOI: 10.1002/chem.201003426

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      Measured approach: Organotin sulfide complexes adopt different structures depending on the length of the intramolecular organic spacer R, as shown by the synthesis of [(RxSn2)2(μ-S)6] (e.g.; 1) or [Rx4Sn12S20] (2). For [(RxSn2)2(μ-S)6], three different arrangements of the organic “straps” attached to [Sn4S6] cages are realized for different length ranges of Rx, whereas the longest spacer provokes a complete rearrangement of the inorganic core to form 2. DFT investigations rationalized the experimental findings.

  7. Full Papers

    1. Top of page
    2. Cover Picture
    3. Inside Cover
    4. Editorial
    5. Graphical Abstract
    6. News
    7. Communications
    8. Full Papers
    9. Preview
    10. Back Cover
    1. Carbon Dioxide Fixation

      The Influence of SO2 and NO2 Impurities on CO2 Gas Hydrate Formation and Stability (pages 4376–4384)

      Dr. Bettina Beeskow-Strauch, Dr. Judith M. Schicks, Dr. Erik Spangenberg and Prof. Jörg Erzinger

      Article first published online: 23 MAR 2011 | DOI: 10.1002/chem.201003262

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      In a variety of CO2sequestration scenarios, contaminants of industrially produced CO2 might be challenging. Gas hydrate reservoirs exhibit possible CO2 sinks, but the influence of impurities on hydrate formation and stability is unknown. This study applies optical microscopy (see figure), laser Raman spectroscopy, X-ray diffraction and differential scanning calorimetry to show the impact of 1 % SO2 or NO2 impurities in CO2 on hydrate formation rates, stability and conversion rates of ice+gas to hydrate.

    2. Photocyclisation

      Highly Efficient Visible-Light Driven Photochromism: Developments towards a Solid-State Molecular Switch Operating through a Triplet-Sensitised Pathway (pages 4385–4395)

      Dr. Simon K. Brayshaw, Stephanie Schiffers, Anna J. Stevenson, Dr. Simon J. Teat, Mark R. Warren, Robert D. Bennett, Dr. Igor V. Sazanovich, Dr. Alastair R. Buckley, Dr. Julia A. Weinstein and Prof. Dr. Paul R. Raithby

      Article first published online: 23 MAR 2011 | DOI: 10.1002/chem.201003487

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      Come to light: The first example of a photochromic dithienylethene functionalised by two PtII chromophoric units has been synthesised and fully structurally and photophysically characterised. These species undergo a single-crystal to single-crystal photocyclisation transformation with unprecedented 80 % efficacy. The presence of the PtII chromophores enabled photocyclisation not only under UV, but also under visible light (see graphic)—this behaviour is observed in a single crystal, in powder, in thin films and in solutions.

    3. Porphyrinoids

      The Synthesis and Properties of Free-Base [14]Triphyrin(2.1.1) Compounds and the Formation of Subporphyrinoid Metal Complexes (pages 4396–4407)

      Dr. Zhao Li Xue, Dr. John Mack, Dr. Hua Lu, Lei Zhang, Prof. Xiao Zeng You, Daiki Kuzuhara, Prof. Martin Stillman, Prof. Hiroko Yamada, Prof. Seigo Yamauchi, Prof. Nagao Kobayashi and Prof. Zhen Shen

      Article first published online: 21 MAR 2011 | DOI: 10.1002/chem.201003100

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      A general synthetic approach for the synthesis of free-base [14]triphyrin(2.1.1) compounds and metal [14]tribenzotriphyrin(2.1.1) complexes (see graphic) is described based on a modified Lindsey-method reaction. The mechanism of [14]triphyrins (2.1.1) formation is described in detail and the effects of exocyclic ring annulation with benzo and naphtho rings are examined based on optical spectroscopy, theoretical calculations, and electrochemical measurements.

    4. Polyoxometalates

      Rates of Water Exchange for Two Cobalt(II) Heteropolyoxotungstate Compounds in Aqueous Solution (pages 4408–4417)

      Dr. C. André Ohlin, Dr. Stephen J. Harley, J. Gregory McAlpin, Dr. Rosalie K. Hocking, Brandon Q. Mercado, Rene L. Johnson, Dr. Eric M. Villa, Mary Kate Fidler, Prof. Marilyn M. Olmstead, Prof. Leone Spiccia, Prof. R. David Britt and Prof. William H. Casey

      Article first published online: 17 MAR 2011 | DOI: 10.1002/chem.201003550

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      A wide range of spectroscopic and potentiometric data indicate that these sandwich molecules are stable at slightly acidic or near-neutral pH and that the solutions are monospecific; CoII is present only in the sandwich complexes (shown here).

    5. Metal Chelating Agents

      A Series of Tripodal Cysteine Derivatives as Water-Soluble Chelators that are Highly Selective for Copper(I) (pages 4418–4428)

      Dr. Anaïs M. Pujol, Dr. Christelle Gateau, Colette Lebrun and Dr. Pascale Delangle

      Article first published online: 17 MAR 2011 | DOI: 10.1002/chem.201003613

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      Thiols can cope with copper: Tripodal pseudopeptide scaffolds extended by three converging cysteines afford several soft sulfur donors for the complexation of CuI in a unique CuS3 environment in water. These sulfur-based chelators (e.g., L1 and L2) exhibit high affinities for CuI and large selectivities with respect to ZnII, which makes them ideal candidates for Cu decorporation in vivo without altering the homeostasis of other essential ions (see graphic).

    6. Carboranes

      Uncommon Coordination Behaviour of P(S) and P(Se) Units when Bonded to Carboranyl Clusters: Experimental and Computational Studies on the Oxidation of Carboranyl Phosphine Ligands (pages 4429–4443)

      Adrian-Radu Popescu, Dr. Anna Laromaine, Prof. Dr. Francesc Teixidor, Prof. Dr. Reijo Sillanpää, Dr. Raikko Kivekäs, Joan Ignasi Llambias and Prof. Dr. Clara Viñas

      Article first published online: 8 MAR 2011 | DOI: 10.1002/chem.201003330

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      Unpredictable coordination behaviour of PS and PSe units: The potential of monochalcogenide carboranyl diphosphines (1-EPPh2-2-PPh2-1,2-closo-C2B10H10; E=S, Se) to behave as unsymmetric chelating bidentate ligands for metal coordination has been studied. Experimental studies showed that the P[DOUBLE BOND]E bond is labile and undergoes dechalcogenation and P[BOND]M bond formation. Computational studies revealed that coordination of the P[DOUBLE BOND]E group is sterically hindered due to CH⋅⋅⋅E H-bonding, while the strongly electron-withdrawing carborane cluster polarizes the P[DOUBLE BOND]E bond towards the P atom (see picture).

    7. Heme Proteins

      A Heme–Peptide Metalloenzyme Mimetic with Natural Peroxidase-Like Activity (pages 4444–4453)

      Prof. Dr. Flavia Nastri, Dr. Liliana Lista, Dr. Paola Ringhieri, Dr. Rosa Vitale, Dr. Marina Faiella, Dr. Concetta Andreozzi, Dr. Paola Travascio, Dr. Ornella Maglio, Prof. Dr. Angela Lombardi and Prof. Dr. Vincenzo Pavone

      Article first published online: 17 MAR 2011 | DOI: 10.1002/chem.201003485

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      Copycat catalyst! FeIII–mimochrome VI, a 3.5 kDa synthetic heme–protein model, displays a peroxidase-like catalytic activity and catalyzes the oxidation of several substrates, including ABTS (2,2′-azino-di(3-ethyl-benzothiazoline-6-sulfonic acid), with a typical Michaelis–Menten mechanism, multiple turnover kinetics, and catalytic efficiency comparable to that of the 45 kDa native horseradish peroxidase (HRP).

    8. Carbon Nanotubes

      Carbon-Nanotube-Based Stimuli-Responsive Controlled-Release System (pages 4454–4459)

      Dr. Xuecheng Chen, Dr. Hongmin Chen, Dr. Carla Tripisciano, Dr. Anna Jedrzejewska, Dr. Mark H. Rümmeli, Prof. Rüdiger Klingeler, Prof. Ryszard J. Kalenczuk, Prof. Paul K. Chu and Prof. Ewa Borowiak-Palen

      Article first published online: 22 MAR 2011 | DOI: 10.1002/chem.201003355

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      Taking control: A stimuli-responsive controlled-release delivery system based on carbon nanotubes is shown. Functional groups attached to the open ends of the tubes enable functionalized silica spheres to preferentially attach to the ends. Reducing agents or elevated temperature allow the controlled release of encapsulated material within the tubes (see picture).

    9. Electron-Poor Anions

      You have full text access to this OnlineOpen article
      Electron Detachment Dissociation for Top-Down Mass Spectrometry of Acidic Proteins (pages 4460–4469)

      Barbara Ganisl, Dr. Taras Valovka, Prof. Dr. Markus Hartl, Monika Taucher, Prof. Dr. Klaus Bister and Dr. Kathrin Breuker

      Article first published online: 23 MAR 2011 | DOI: 10.1002/chem.201003709

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      A sense of detachment: Detachment of electrons from multiply deprotonated proteins gives radical ions (see scheme) that can undergo unimolecular dissociation into sequence-informative fragment ions from protein backbone cleavage. The potential of electron detachment dissociation (EDD) for top-down mass spectrometry of acidic proteins is explored.

    10. Mg–Zn Hybrids

      Shedding New Light on ZnCl2-Mediated Addition Reactions of Grignard Reagents to Ketones: Structural Authentication of Key Intermediates and Diffusion-Ordered NMR Studies (pages 4470–4479)

      Dr. David R. Armstrong, Prof. William Clegg, Dr. Pablo García-Alvarez, Matthew D. McCall, Lorraine Nuttall, Dr. Alan R. Kennedy, Dr. Luca Russo and Dr. Eva Hevia

      Article first published online: 1 MAR 2011 | DOI: 10.1002/chem.201002544

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      Perfect match! Combining the chemoselectivity of zinc with the kinetic reactivity of polar magnesium, novel synergic Mg–Zn hybrid reagents efficiently catalyse addition reactions of Grignard reagents to benzophenone, generating a magnesium alkoxide on a MgCl2 support (see scheme).

    11. 1,2-Amino Alcohols

      Synthesis of 1,2-Amino Alcohols by Sigmatropic Rearrangements of 3-(N-Tosylamino)allylic Alcohol Derivatives (pages 4480–4495)

      Dr. Marion Barbazanges, Dr. Christophe Meyer, Dr. Janine Cossy and Dr. Peter Turner

      Article first published online: 17 FEB 2011 | DOI: 10.1002/chem.201003265

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      Playing with enamides: Sigmatropic rearrangements of 3-(N-tosylamino)allylic alcohol derivatives, a particular class of enamides, have been investigated (see scheme). Whereas the presence of the nitrogen atom alters the stereochemical outcome of Ireland–Claisen rearrangements of glycolate derivatives, [2,3]-Wittig rearrangements provide a stereoselective access to functionalized 1,2-amino alcohols.

    12. Surface Chemistry

      The Role of Surface and Subsurface Point Defects for Chemical Model Studies on TiO2: A First-Principles Theoretical Study of Formaldehyde Bonding on Rutile TiO2(110) (pages 4496–4506)

      Dr. Jan Haubrich, Prof. Efthimios Kaxiras and Prof. Cynthia M. Friend

      Article first published online: 23 MAR 2011 | DOI: 10.1002/chem.201002588

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      Accurate picture includes defects: The importance of including surface and subsurface point defects to obtain correct adsorption sites, structures, and energetics is illustrated by a first-principles density functional theoretical study on the adsorption of formaldehyde on rutile TiO2(110) surfaces.

    13. Lactide Polymerization

      Mechanism of the Living Lactide Polymerization Mediated by Robust Zinc Guanidine Complexes (pages 4507–4512)

      Dr. Janna Börner, M. Sc. Ines dos Santos Vieira, Dr. Alexander Pawlis, Dipl.-Chem. Artjom Döring, Prof. Dr. Dirk Kuckling and Dr. Sonja Herres-Pawlis

      Article first published online: 12 JAN 2011 | DOI: 10.1002/chem.201002690

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      Robust and efficient: Zinc bis(chelate) guanidine complexes promote living lactide polymerization at elevated temperatures. The guanidine function initiates the polymerization by a nucleophilic ring-opening step on the lactide molecule. For the first time, kinetic and spectroscopic analyses and DFT calculations disclose the mechanism of these initiators making use of neutral ligands.

    14. Kinetics

      Visible Light-Induced Release of Nitrogen Monoxide from a Nitrosylrhodium Complex (pages 4513–4517)

      Dr. Wenjing Song, Dr. Kathleen E. Kristian and Prof. Andreja Bakac

      Article first published online: 23 FEB 2011 | DOI: 10.1002/chem.201003003

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      Top of the class: Irradiation in the 648 nm band of a nitrosylrhodium complex [L2(H2O)RhNO]2+ in aqueous solutions generates NO with a quantum yield of 1.00±0.07, the highest ever reported for a nitrosyl complex under any conditions.

    15. Kinetics and Mechanism of Hydrogen-Atom Abstraction from Rhodium Hydrides by Alkyl Radicals in Aqueous Solutions (pages 4518–4522)

      Dr. Oleg Pestovsky, Dr. Stephen W. Veysey and Prof. Andreja Bakac

      Article first published online: 22 MAR 2011 | DOI: 10.1002/chem.201100094

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      Hydrogen-atom abstraction from macrocyclic rhodium(III) hydrides [L(H2O)RhH{D}]2+ by methyl and benzyl radicals is fast and exhibits a small normal kinetic isotope effect, kH/kD=1.5 for benzyl and 1.4 for methyl.

    16. Acrylamide Synthesis

      Microwave-Assisted Aminocarbonylation of Ynamides by Using Catalytic [Fe3(CO)12] at Low Pressures of Carbon Monoxide (pages 4523–4528)

      Marianna Pizzetti, Adele Russo and Dr. Elena Petricci

      Article first published online: 25 MAR 2011 | DOI: 10.1002/chem.201100447

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      On the crest of a (micro)wave: The microwave-assisted aminocarbonylation of ynamides (see scheme) at low pressures of CO is reported. A new class of (E)-acrylamides has been regioselectively synthesized after microwave irradiation for only 20 min by using [Fe3(CO)12] as the catalyst precursor and triethylamine (TEA) as the ligand. This transformation is atom economic and can also be efficiently applied to the alkoxycarbonylation of alkynes.

    17. G-Quadruplexes

      Recognition of G-Quadruplex DNA by Triangular Star-Shaped Compounds: With or Without Side Chains? (pages 4529–4539)

      Dr. Hélène Bertrand, Dr. Anton Granzhan, Dr. David Monchaud, Dr. Nicolas Saettel, Dr. Régis Guillot, Dr. Sarah Clifford, Aurore Guédin, Dr. Jean-Louis Mergny and Dr. Marie-Paule Teulade-Fichou

      Article first published online: 17 MAR 2011 | DOI: 10.1002/chem.201002810

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      A new star! Two new series of C3-symmetric, star-shaped aromatic compounds, differing in the presence or the absence of side chains, were synthesized. Comparison of data collected with telomeric and c-myc quadruplexes shows that the nonsubstituted trisquinolizinium derivative (TrisQ) is more efficient than the trisubstituted triazatrinaphthalene derivatives (TrisK) for quadruplex recognition. TrisQ is thus a highly promising quadruplex binder that rivals the performance of the well-established ligand BRACO-19.

    18. Mixed-Valent Peptides

      Oligonuclear Ferrocene Amides: Mixed-Valent Peptides and Potential Redox-Switchable Foldamers (pages 4540–4551)

      Dipl.-Chem. Daniel Siebler, Dipl.-Chem. Michael Linseis, Dipl.-Chem. Teuta Gasi, Dr. Luca M. Carrella, Prof. Dr. Rainer F. Winter, Dr. Christoph Förster and Prof. Dr. Katja Heinze

      Article first published online: 27 JAN 2011 | DOI: 10.1002/chem.201002101

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      1, 2, 3! The building blocks in oligonuclear ferrocene amides with defined secondary structure can be sequentially oxidized. The singly and doubly charged mixed-valent cations were probed experimentally by VIS/NIR, paramagnetic NMR and Mössbauer spectroscopy as well as by DFT calculations. The third oxidation breaks the hydrogen bonding and unfolds the ferrocene peptide (see picture).

    19. Nanocontainers

      Enzymatic Cascade Reactions inside Polymeric Nanocontainers: A Means to Combat Oxidative Stress (pages 4552–4560)

      Pascal Tanner, Dr. Ozana Onaca, Vimalkumar Balasubramanian, Prof. Wolfgang Meier and Priv. Doz. Dr. Cornelia G. Palivan

      Article first published online: 1 MAR 2011 | DOI: 10.1002/chem.201002782

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      Keeping it together: Enzymatic cascade reactions inside polymeric nanocontainers (see scheme) are introduced as a new theranostic concept. Two enzymes that act in tandem in the cavities of polymeric vesicles allow the simultaneous detection and detoxification of O2.− radicals and related, harmful H2O2. The system behaves as artificial organelles in THP-1 cells.

    20. DNA Recognition

      Carbohydrate Recognition at the Minor-Groove of the Self-Complementary Duplex d(CGCGAATTCGCG)2 by a Synthetic Glyco-oligoamide (pages 4561–4570)

      Dr. Pablo Peñalver, Dr. Filipa Marcelo, Prof. Jesús Jiménez-Barbero and Dr. Cristina Vicent

      Article first published online: 21 JAN 2011 | DOI: 10.1002/chem.201003027

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      Sweet spot: Carbohydrate recognition at the minor groove of DNA oligonucleotides was investigated using a neutral glyco-conjugate β-Gal-Py-γ-Py-Ind (see figure).

    21. Synthesis and Binding Studies of Novel Diethynyl-Pyridine Amides with Genomic Promoter DNA G-Quadruplexes (pages 4571–4581)

      Dr. Jyotirmayee Dash, Dr. Zoë A. E. Waller, Dr. G. Dan Pantoş and Prof. Dr. Shankar Balasubramanian

      Article first published online: 8 MAR 2011 | DOI: 10.1002/chem.201003157

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      Click side chains! Click chemistry has been used as a promising tool for side chain functionalisation of a diethynyl-pyridine carboxamide scaffold. The obtained ligands were screened by using structurally diverse genomic promoter G-quadruplex DNA sequences leading to enhanced specificity and differential recognition (see picture for an example).

    22. Rotational Spectroscopy

      Chirality Recognition in the Glycidol⋅⋅⋅Propylene Oxide Complex: A Rotational Spectroscopic Study (pages 4582–4587)

      Javix Thomas, Dr. Fumie X. Sunahori, Dr. Nicole Borho and Prof. Dr. Yunjie Xu

      Article first published online: 23 MAR 2011 | DOI: 10.1002/chem.201003536

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      Chirality recognition in the H-bonded adduct between two permanently chiral molecules, glycidol (Gly) and propylene oxide (PO), has been investigated by rotational spectroscopy and ab initio calculations. The relative stability of the Gly monomeric conformers, gG+ and g+G−, is reversed when binding to PO in some cases. We have analyzed the six H-bonded Gly⋅⋅⋅PO conformers observed and examined what the dominant contributions are in preferentially stabilizing a particular binary conformer.

    23. Organogels

      Self-Assembly of Chiral trans-Cyclobutane-Containing β-Dipeptides into Ordered Aggregates (pages 4588–4597)

      Esther Gorrea, Dr. Pau Nolis, Dr. Elisabeth Torres, Dr. Eric Da Silva, Prof. David B. Amabilino, Prof. Vicenç Branchadell and Prof. Rosa M. Ortuño

      Article first published online: 14 MAR 2011 | DOI: 10.1002/chem.201002193

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      Twist into a gel: Hierarchical self-assembly of β-dipeptides 1 and 2 into fibrils (see scheme; Boc=tert-butyloxycarbonyl), which in turn interact with one another to form gels, is investigated by a combined experimental and theoretical approach. The orientation of two consecutive molecules in a single hydrogen-bonded chain is head-to-head for 1 and head-to-tail for 2 providing helical aggregates.

    24. Supramolecular Chemistry

      Amine Exchange in Formamidines: An Experimental and Theoretical Study (pages 4598–4612)

      Marinha dF. Capela, Dr. Nicholas J. Mosey, Liyan Xing, Dr. Ruiyao Wang and Dr. Anne Petitjean

      Article first published online: 17 FEB 2011 | DOI: 10.1002/chem.201002389

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      Formamidable!N,N′-Disubstituted formamidines are activated towards constitutional exchange by protonation within a geometrically well-defined ion–pair complex (see scheme). Thanks to the tautomeric equilibrium, both C[BOND]N bonds are susceptible to exchange. Three regimes for the exchange process may be distinguished, depending on the incoming nucleophile. Applications to the templated synthesis of large architectures are discussed.

    25. Explosives

      1-Amino-1-hydrazino-2,2-dinitroethene and Corresponding Salts: Synthesis, Characterization, and Thermolysis Studies (pages 4613–4618)

      Prof. Dr. Haixiang Gao, Dr. Young-Hyuk Joo, Dr. Damon A. Parrish, Thao Vo and Prof. Dr. Jean'ne M. Shreeve

      Article first published online: 17 MAR 2011 | DOI: 10.1002/chem.201002858

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      Add salt carefully! Amino-1-hydrazino-2,2-dinitroethene (1) is unstable and undergoes spontaneous energetic decomposition. However, newly synthesized salts of 1 (see graphic) are more thermally stable and have detonation properties that are comparable with RDX (1,3,5-trinitroperhydro-1,3,5-triazine) and HMX (octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine).

      Corrected by:

      Corrigendum: Corrigendum: 1-Amino-1-hydrazino-2,2-dinitroethene and Corresponding Salts: Synthesis, Characterization, and Thermolysis Studies

      Vol. 17, Issue 49, 13639, Article first published online: 28 NOV 2011

    26. Composite Materials

      Synthesis, Characterisation and Cytotoxicity of Polyoxometalate/Carboxymethyl Chitosan Nanocomposites (pages 4619–4625)

      Georg Geisberger, Susann Paulus, Dr. Mauro Carraro, Prof. Marcella Bonchio and Prof. Greta R. Patzke

      Article first published online: 14 FEB 2011 | DOI: 10.1002/chem.201002815

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      Reduced toxicity: Carboxymethyl chitosan and polyoxometalates (POMs) form core-shell systems of about 100 nm in size (see figure). The encapsulation of the polyoxometalates drastically reduces their cytotoxicities. This opens up new avenues for designing inorganic drug prototypes from bioactive POMs.

    27. Gold Nanoparticles

      On the Stabilization of Gold Nanoparticles over Silica-Based Magnetic Supports Modified with Organosilanes (pages 4626–4631)

      Dipl.-Chem. Rafael L. Oliveira, Prof. Dr. Daniela Zanchet, Prof. Dr. Pedro K. Kiyohara and Prof. Dr. Liane M. Rossi

      Article first published online: 24 FEB 2011 | DOI: 10.1002/chem.201002251

      Thumbnail image of graphical abstract

      Catch me if you can! The immobilization of gold nanoparticles (Au NPs) on silica was made possible by the functionalization of the silica surfaces with organosilanes (see scheme). Using this principle, an amino-modified, silica-based, magnetic support was used to prepare an easily recoverable and very active Au NP catalyst for the chemoselective oxidation of alcohols.

    28. Supported Catalysts

      Quantitative Investigation of a Hybrid Ziegler–Natta Catalyst Support Prepared by Grafting Di(n-butyl)magnesium onto Partially Dehydroxylated Silica (pages 4632–4639)

      Ming-Yung Lee and Susannah L. Scott

      Article first published online: 23 MAR 2011 | DOI: 10.1002/chem.201002576

      Thumbnail image of graphical abstract

      Support act: Highly dispersed MgCl2 nanoclusters (see figure) are formed upon hydrochlorination of nBu2Mg-modified silica during the preparation of a hybrid Ziegler–Natta catalyst support.

    29. Electrochemistry

      Green and Blue Electrochemically Generated Chemiluminescence from Click Chemistry—Customizable Iridium Complexes (pages 4640–4647)

      Dr. Simone Zanarini, Marco Felici, Dr. Giovanni Valenti, Dr. Massimo Marcaccio, Prof. Dr. Luca Prodi, Dr. Sara Bonacchi, Pablo Contreras-Carballada, Dr. Rene M. Williams, Dr. Martin C. Feiters, Prof. Dr. Roeland J. M. Nolte, Prof. Dr. Luisa De Cola and Prof. Dr. Francesco Paolucci

      Article first published online: 23 MAR 2011 | DOI: 10.1002/chem.201002956

      Thumbnail image of graphical abstract

      Tune the colors! Thanks to their excellent photophysical and electrochemical properties, cationic phenylpyridine cyclometalated iridium complexes, containing a triazole–pyridine ligand, generate intense green electrochemiluminescence (ECL) in organic solvents and in water. Fluorination of the ligand allows for the easy and effective modulation of emission to blue (see graphic).

    30. Phase Transfer

      Versatile Phase Transfer of Gold Nanoparticles from Aqueous Media to Different Organic Media (pages 4648–4654)

      Dr. Matthias Karg, Dr. Natascha Schelero, Claudia Oppel, Prof. Dr. Michael Gradzielski, Dr. Thomas Hellweg and Prof. Dr. Regine von Klitzing

      Article first published online: 23 MAR 2011 | DOI: 10.1002/chem.201003340

      Thumbnail image of graphical abstract

      Going for gold! Gold nanoparticles of various sizes are efficiently and rapidly transferred from the aqueous phase to different organic solvents (see figure) by ligand exchange using alkylamines with different chain lengths.

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      Preview: Chem. Eur. J. 17/2011 (page 4659)

      Article first published online: 1 APR 2011 | DOI: 10.1002/chem.201190080

  9. Back Cover

    1. Top of page
    2. Cover Picture
    3. Inside Cover
    4. Editorial
    5. Graphical Abstract
    6. News
    7. Communications
    8. Full Papers
    9. Preview
    10. Back Cover
    1. Back Cover: A Non-sandwiched Macrocyclic Monolanthanide Single-Molecule Magnet: The Key Role of Axiality (Chem. Eur. J. 16/2011) (page 4660)

      Humphrey L. C. Feltham, Dr. Yanhua Lan, Frederik Klöwer , Liviu Ungur, Prof. Liviu F. Chibotaru, Prof. Annie K. Powell and Prof. Sally Brooker

      Article first published online: 1 APR 2011 | DOI: 10.1002/chem.201190081

      Thumbnail image of graphical abstract

      New class of macrocyclic single-molecule magnet in which a single lanthanide ion is coordinated inside the designer cavity of a single macrocyclic ligand, are reported by L. F. Chibotaru, A. K. Powell, S. Brooker et al. in their Communication on page 4362 ff. This development will facilitate systematic studies of families of M3Ln complexes, in which M, Ln, and the Schiff base macrocycle size and substituents are varied, whilst retaining the M3Ln core. Image kindly created by Michael Crawford (Dunedin).

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