Chemistry - A European Journal

Cover image for Vol. 16 Issue 7

February 15, 2010

Volume 16, Issue 7

Pages 2007–2321

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Inside Cover
    4. Graphical Abstract
    5. Corrigendum
    6. News
    7. Communications
    8. Full Papers
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    1. Cover Picture: Two Distinct Mechanisms of Alkyne Insertion into the Metal–Sulfur Bond: Combined Experimental and Theoretical Study and Application in Catalysis (Chem. Eur. J. 7/2010) (page 2007)

      Valentine P. Ananikov, Konstantin A. Gayduk, Nikolay V. Orlov, Irina P. Beletskaya, Victor N. Khrustalev and Mikhail Yu. Antipin

      Version of Record online: 8 FEB 2010 | DOI: 10.1002/chem.201090022

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      The solution to a long-standing problem of selective S[BOND]S bond addition to internal alkynes as well as the development of a new look at the mechanistic picture of these reactions is discussed by I. P. Beletskaya, V. P. Ananikov et al. in their Full Paper on page 2063 ff. They discovered that two pathways of C[BOND]S reductive elimination are possible and the nature of the ligand is the key controlling factor. The first pathway selectively involves terminal alkynes, whereas the second pathway is suitable for both terminal and internal alkynes.

  2. Inside Cover

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    4. Graphical Abstract
    5. Corrigendum
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    1. Inside Cover: Iodine-Catalyzed Highly Diastereoselective Synthesis of trans-2,6-Disubstituted-3,4-Dihydropyrans: Application to Concise Construction of C28–C37 Bicyclic Core of (+)-Sorangicin A (Chem. Eur. J. 7/2010) (page 2008)

      Debendra K. Mohapatra, Pragna P. Das, Manas Ranjan Pattanayak and J. S. Yadav

      Version of Record online: 8 FEB 2010 | DOI: 10.1002/chem.201090023

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      A double iodocyclization is reported by D. K. Mohapatra, J. S. Yadav et al. in the Full Paper on page 2072 ff. A novel iodine-catalyzed highly diastereoselective synthesis of trans-2,6-disubstituted-3,4-dihydropyran ring system has been achieved that can be utilized for the synthesis of diversified complex biologically active natural products.

  3. Graphical Abstract

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    4. Graphical Abstract
    5. Corrigendum
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  4. Corrigendum

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    3. Inside Cover
    4. Graphical Abstract
    5. Corrigendum
    6. News
    7. Communications
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  5. News

    1. Top of page
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    3. Inside Cover
    4. Graphical Abstract
    5. Corrigendum
    6. News
    7. Communications
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  6. Communications

    1. Top of page
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    5. Corrigendum
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    1. Morpholino Primer Extension

      A Non-Enzymatic, DNA Template-Directed Morpholino Primer Extension Approach (pages 2026–2030)

      Neil M. Bell, Raymond Wong and Jason Micklefield

      Version of Record online: 19 JAN 2010 | DOI: 10.1002/chem.200902237

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      Extension, please! A non-enzymatic DNA-template-directed synthesis approach has been developed that allows the morpholino-nucleoside extension of a PNA primer. Equilibration of the ribonucleosides with the template–primer complex, in a non-covalent fashion (see scheme), was shown to be essential for high selectivity. It is envisaged that this chemistry might be used to transcribe nature's genetic material into alternative abiological polymers.

    2. Synthetic Methods

      A Facile One-Pot Transformation of Baylis–Hillman Adducts into Unsymmetrical Disubstituted Maleimide and Maleic Anhydride Frameworks: A Facile Synthesis of Himanimide A (pages 2031–2035)

      Deevi Basavaiah, Badugu Devendar, Kunche Aravindu and Ainelly Veerendhar

      Version of Record online: 20 JAN 2010 | DOI: 10.1002/chem.200902887

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      Unsymmetrical, disubstituted maleimide and maleic anhydride frameworks have been accessed from Baylis–Hillman adducts in an operationally simple three-step (Friedel–Crafts reaction, selective hydrolysis, and cyclization), one-pot strategy. This strategy has been successfully extended to the synthesis of a representative bioactive compound, himanimide A (see scheme).

    3. Asymmetric Catalysis

      Iridium-Catalyzed Asymmetric Hydrogenation of N-Protected Indoles (pages 2036–2039)

      Alejandro Baeza and Andreas Pfaltz

      Version of Record online: 26 JAN 2010 | DOI: 10.1002/chem.200903105

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      Chiral indolines substituted at C-2 or C-3 can be prepared in high yield and excellent enantioselectivity by asymmetric hydrogenation of N-protected indoles by using Ir catalysts with chiral N,P ligands. With less reactive substrates, the reaction had to be carried out at elevated temperature, but even at 60–110 °C very high enantiomeric excesses of up to 98–99 % could be obtained (see scheme).

    4. Boron Chemistry

      Ni[RIGHTWARDS ARROW]B Interactions in Nickel Phosphino-Alkynyl-Borane Complexes (pages 2040–2044)

      Xiaoxi Zhao, Edwin Otten, Datong Song and Douglas W. Stephan

      Version of Record online: 20 JAN 2010 | DOI: 10.1002/chem.200902888

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      Boron bends over for nickel: The Ni complexes [{tBu2PC[TRIPLE BOND]CB(C6F5)2}Ni(cod)] (1) and [({tBu2PC[TRIPLE BOND]CB(C6F5)2}Ni(NCMe))2] (2) derived from the reaction between the phosphino-alkynyl-borane tBu2PC[TRIPLE BOND]CB(C6F5)2 and [Ni(cod)2] exhibit an unprecedented metal–alkyne interaction in which the borane substituent bends towards the metal affording a Ni[RIGHTWARDS ARROW]B dative interaction.

    5. Asymmetric Catalysis

      Asymmetric SN1 α-Alkylation of Cyclic Ketones Catalyzed by Functionalized Chiral Ionic Liquid (FCIL) Organocatalysts (pages 2045–2049)

      Long Zhang, Lingyun Cui, Xin Li, Jiuyuan Li, Sanzhong Luo and Jin-Pei Cheng

      Version of Record online: 20 JAN 2010 | DOI: 10.1002/chem.200902509

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      Ionic liquid works better: The first intermolecular asymmetric α-alkylation of cyclic ketones was realized by using functionalized chiral ionic liquids as catalysts. The reaction proceeded with good to excellent yields and high ee. Highly stereoselective desymmetrization of 4-substituted cyclohexanones with >99:1 d.r. and up to 87 % ee were achieved by using this protocol.

    6. Organic–Inorganic Composites

      From an Organic-Functionalized Ge4S6 Cage to a Chalcogenidometallate Organic Coordination Framework with Antiferromagnetic Chain Behavior (pages 2050–2053)

      Zohreh Hassanzadeh Fard, Rodolphe Clérac and Stefanie Dehnen

      Version of Record online: 15 JAN 2010 | DOI: 10.1002/chem.200902921

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      Not guilty—the cluster was framed! We report the proof of principle for an approach toward a novel type of inorganic–organic hybrid compound. Compound [Mn2{(OOCC2H4Ge)4S6}(MeOH)(dmf)2] is constructed by inorganic cages (Ge4S6) that are linked through terminal COO donor groups by Mn2+ ions within zigzag chains of corner-sharing [MnO6] units, exhibiting intrachain antiferromagnetic coupling (see figure).

  7. Full Papers

    1. Top of page
    2. Cover Picture
    3. Inside Cover
    4. Graphical Abstract
    5. Corrigendum
    6. News
    7. Communications
    8. Full Papers
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    1. Nanotechnology

      Effect of the ortho Modification of Azobenzene on the Photoregulatory Efficiency of DNA Hybridization and the Thermal Stability of its cis Form (pages 2054–2062)

      Hidenori Nishioka, Xingguo Liang and Hiroyuki Asanuma

      Version of Record online: 26 JAN 2010 | DOI: 10.1002/chem.200902789

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      Efficient photoregulation: We synthesized various azobenzenes that are methylated at their ortho positions for more effective photoregulation of DNA hybridization (see figure). 4-Carboxy-2′,6′-dimethylazobenzene (2′,6′-Me-Azo) showed the most efficient photoregulatory ability. In addition, cis-2′,6′-Me-Azo showed higher thermal stability than other azobenzenes.

    2. C[BOND]S Bond Formation

      Two Distinct Mechanisms of Alkyne Insertion into the Metal–Sulfur Bond: Combined Experimental and Theoretical Study and Application in Catalysis (pages 2063–2071)

      Valentine P. Ananikov, Konstantin A. Gayduk, Nikolay V. Orlov, Irina P. Beletskaya, Victor N. Khrustalev and Mikhail Yu. Antipin

      Version of Record online: 28 JAN 2010 | DOI: 10.1002/chem.200902928

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      Two different mechanisms of multiple carbon–carbon bond insertion into the metal–heteroatom bond have been studied. A five-coordinate metal complex resulted in product formation without preliminary ligand dissociation on the alkyne insertion stage. The results of the mechanistic study were utilized to construct a new catalytic reaction to form target vinyl sulfides with high yields (up to 99 %) and excellent selectivity (>99:1).

    3. Asymmetric Synthesis

      Iodine-Catalyzed Highly Diastereoselective Synthesis of trans-2,6-Disubstituted-3,4-Dihydropyrans: Application to Concise Construction of C28–C37 Bicyclic Core of (+)-Sorangicin A (pages 2072–2078)

      Debendra K. Mohapatra, Pragna P. Das, Manas Ranjan Pattanayak and J. S. Yadav

      Version of Record online: 22 JAN 2010 | DOI: 10.1002/chem.200902999

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      Double iodocyclization: An iodine-catalyzed cyclization that led to exclusive formation of trans-2,6-disubstituted-3,4-dihydropyrans is described. A second iodo-cyclization has been carried out for an efficient and concise synthesis of novel C28–C37 bicyclic core of (+)-sorangicin A in 8 steps with 21 % overall yield (see scheme).

    4. Surface Coordination Networks

      Aggregation and Contingent Metal/Surface Reactivity of 1,3,8,10-Tetraazaperopyrene (TAPP) on Cu(111) (pages 2079–2091)

      Manfred Matena, Meike Stöhr, Till Riehm, Jonas Björk, Susanne Martens, Matthew S. Dyer, Mats Persson, Jorge Lobo-Checa, Kathrin Müller, Mihaela Enache, Hubert Wadepohl, Jörg Zegenhagen, Thomas A. Jung and Lutz H. Gade

      Version of Record online: 14 JAN 2010 | DOI: 10.1002/chem.200902596

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      TAPP on copper: 1,3,8,10-Tetraazaperopyrene (TAPP) is chemically activated on a copper (111) surface, with its mobile adatoms, to form a highly ordered surface coordination network. At elevated temperatures it reacts to generate covalently coupled polymers, as illustrated. The copper substrate is crucially important in determining the structures of the aggregates and available reaction channels on the surface.

    5. Host–Guest Systems

      Structures and Properties of Spherical 90-Vertex Fullerene-Like Nanoballs (pages 2092–2107)

      Manfred Scheer, Andrea Schindler, Junfeng Bai, Brian P. Johnson, Roger Merkle, Rainer Winter, Alexander V. Virovets, Eugenia V. Peresypkina, Vladislav A. Blatov, Marek Sierka and Hellmut Eckert

      Version of Record online: 14 JAN 2010 | DOI: 10.1002/chem.200902554

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      Giant spherical molecules (o.d. ca. 2.25 nm) consisting of 90 non-carbon core atoms and having fullerene-like structures were obtained by reactions of the pentaphosphaferrocene [(η5-C5Me5)Fe(η5-P5)] with CuI halides. The spheres self-assemble with the help of pentaphosphaferrocene as the guest (one of two orientations is shown in the picture). Despite their size, they are soluble in mixtures of solvents.

    6. Microspheres

      Microspheres of Mixed Proteins (pages 2108–2114)

      Ulyana Angel (Shimanovich), Devorah Matas, Shulamit Michaeli, Artur Cavaco-Paulo and Aharon Gedanken

      Version of Record online: 11 JAN 2010 | DOI: 10.1002/chem.200902098

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      Mix it up! By using high-intensity ultrasound, mixed protein microspheres (MPMs) were synthesized (see figure). The three proteins used in the current experiments are bovine serum albumin (BSA), green fluorescent protein (GFP), and cyan fluorescent protein–glucose binding protein–yellow fluorescent fused protein (CFP-GBP-YFP). The two synthesized microspheres made of mixed proteins are BSA-GFP and BSA-(CFP-GBP-YFP).

    7. Radiopharmaceuticals

      Tetraamine-Derived Bifunctional Chelators for Technetium-99m Labelling: Synthesis, Bioconjugation and Evaluation as Targeted SPECT Imaging Probes for GRP-Receptor-Positive Tumours (pages 2115–2124)

      Keelara Abiraj, Rosalba Mansi, Maria-Luisa Tamma, Flavio Forrer, Renzo Cescato, Jean Claude Reubi, Kayhan G. Akyel and Helmut R. Maecke

      Version of Record online: 11 JAN 2010 | DOI: 10.1002/chem.200902011

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      Right on target: The facile synthesis of different tetraamine (N4)-based chelators for the conjugation of biomolecules and subsequent labelling with 99mTc is described (see scheme). A bombesin-antagonist peptide conjugated to one of the N4 chelators showed excellent properties as a probe for single-photon-emission computed tomography (SPECT) imaging for gastrin-releasing peptide (GRP)-receptor-positive tumours as the targets.

    8. Luminescence Sensing

      Surface Modification and Functionalization of Microporous Hybrid Material for Luminescence Sensing (pages 2125–2130)

      Huanrong Li, Wenjing Cheng, Yu Wang, Binyuan Liu, Wenjun Zhang and Hongjie Zhang

      Version of Record online: 11 JAN 2010 | DOI: 10.1002/chem.200901687

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      Lighting up zeolites! A novel core-shell material (2) was obtained by initially coating lanthanide-loaded zeolite L microcrystals (1) with polyelectrolytes and with a silica shell. The luminescent core-shell material was further functionalized with a silylated terbium(III) complex and the obtained material (3) was used for the luminescence sensing of dipicolinic acid (DPA), which is a major constituent of many pathogenic spore-forming bacteria (see scheme).

    9. Co-crystal Interactions

      Co-crystals with Acetylene: Small Is not Simple! (pages 2131–2146)

      Michael T. Kirchner, Dieter Bläser and Roland Boese

      Version of Record online: 22 DEC 2009 | DOI: 10.1002/chem.200901314

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      Complicated versatility: Acetylene is an amazingly versatile component for the formation of co-crystals. It requires careful handling and special techniques for crystallisation, but the efforts seem to be rewarding when attaining co-crystals with small molecules as partners (see figure). Many basic questions, such as the dominance of specific heterogeneous intermolecular interactions and their driving force for the formation of multicomponent crystals, are expected to be easily analysed.

    10. Epoxidation Catalysis

      A Computational Study of the Olefin Epoxidation Mechanism Catalyzed by Cyclopentadienyloxidomolybdenum(VI) Complexes (pages 2147–2158)

      Aleix Comas-Vives, Agustí Lledós and Rinaldo Poli

      Version of Record online: 7 JAN 2010 | DOI: 10.1002/chem.200902873

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      Sharpless or Mimoun? The mechanism of olefin epoxidation catalyzed by cyclopentadienyloxidomolybdenum(VI) complexes is revised on the basis of DFT calculations. A pathway related to a proposition by Thiel, involving oxidant activation with proton transfer to an oxido ligand and subsequent exogenous electrophilic attack of the MoOOR Oα atom by the olefin, is found to be the preferred pathway for this system (see figure).

    11. Supramolecular Chemistry

      Acid–Base Controllable Recognition Properties of a Highly Versatile Calix[6]crypturea (pages 2159–2169)

      Mickaël Ménand and Ivan Jabin

      Version of Record online: 11 JAN 2010 | DOI: 10.1002/chem.200902792

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      Tunable receptor: A heteroditopic receptor combining a calix[6]arene framework and a tris(2-aminoethyl)amine-based tris-ureido cap displays remarkable binding properties toward charged or neutral species. These versatile properties are acid–base controllable, allowing the design of sophisticated three-pole supramolecular switches (see figure).

    12. Protein–Inorganic Arrays

      Protein–Inorganic Array Construction: Design and Synthesis of the Building Blocks (pages 2170–2180)

      Niculina D. Bogdan, Mihaela Matache, Veronika M. Meier, Cristian Dobrotă, Ioana Dumitru, Gheorghe D. Roiban and Daniel P. Funeriu

      Version of Record online: 8 JAN 2010 | DOI: 10.1002/chem.200902649

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      One step beyond—expanding the size and complexity of supramolecular constructs: We describe the design and synthesis of the first series of di-functional ligands for the directed construction of inorganic–protein frameworks (see scheme). Composed of a metal-ion binding moiety (terpyridine-based) conjugated to an epoxysuccinyl peptide (known to covalently bind active cysteine proteases), the ligands are best synthesized through a click-chemistry approach.

    13. Hydrogenation

      Platinum Nanoparticles: The Crucial Role of Crystal Face and Colloid Stabilizer in the Diastereoselective Hydrogenation of Cinchonidine (pages 2181–2192)

      Erik Schmidt, Wolfgang Kleist, Frank Krumeich, Tamas Mallat and Alfons Baiker

      Version of Record online: 28 DEC 2009 | DOI: 10.1002/chem.200902517

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      It's a cinch(onidine): Poly(acrylic acid) (PAA)-stabilized Pt nanoparticles were tested in the hydrogenation of the heteroaromatic ring of cinchonidine. The diastereomeric excess (de) of the (S)-hexahydrocinchonidine in toluene increased upon increasing the Pt{111}/{100} ratio, but only after the oxidative removal of PAA at 473 K. The presence of PAA on the samples inverted the de to R, similar to the use of acetic acid as solvent (see graphic).

    14. Metallofullerenes

      Regioselective Exohedral Functionalization of La@C82 and its 1,2,3,4,5-Pentamethylcyclopentadiene and Adamantylidene Adducts (pages 2193–2197)

      Yutaka Maeda, Satoru Sato, Koji Inada, Hidefumi Nikawa, Michio Yamada, Naomi Mizorogi, Tadashi Hasegawa, Takahiro Tsuchiya, Takeshi Akasaka, Tatsuhisa Kato, Zdenek Slanina and Shigeru Nagase

      Version of Record online: 4 JAN 2010 | DOI: 10.1002/chem.200902512

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      This way and that: The first regioselective functionalization of La@C82 by two different groups was conducted. Bis-adducts of La@C82 with Cp* and adamantylidene were synthesized by using two routes (see scheme) and were characterized. Spectroscopic analysis and theoretical calculations revealed that the addition position is controlled by the charge density and p-orbital axis vector value of the fullerene cage.

    15. Crystal Structures

      Lithium Argyrodites with Phosphorus and Arsenic: Order and Disorder of Lithium Atoms, Crystal Chemistry, and Phase Transitions (pages 2198–2206)

      Shiao-Tong Kong, Hans-Jörg Deiseroth, Christof Reiner, Özgül Gün, Elmar Neumann, Clemens Ritter and Dirk Zahn

      Version of Record online: 11 JAN 2010 | DOI: 10.1002/chem.200902470

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      Cold crystals: Crystal structures and temperature-dependent phase transitions of new and known lithium argyrodites are discussed against the background of the Frank–Kasper model of tetrahedral close packing. A close structural relationship between Li and Cu/Ag argyrodites is established. A powder neutron diffraction study of Li6PS5I (see figure) down to 5 K is presented. It gives a detailed insight into the crystal structure of a low-temperature modification of a Li argyrodite for the first time.

    16. Molecular Magnetism

      Multifunctional Magnetic Materials Obtained by Insertion of a Spin-Crossover FeIII Complex into Bimetallic Oxalate-Based Ferromagnets (pages 2207–2219)

      Miguel Clemente-León, Eugenio Coronado, Maurici López-Jordà, Guillermo Mínguez Espallargas, Alejandra Soriano-Portillo and João C. Waerenborgh

      Version of Record online: 28 DEC 2009 | DOI: 10.1002/chem.200902668

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      Two from a template: The syntheses, structures, and magnetic properties of bimetallic oxalate-based compounds of formula [MIII(sal2-trien)][MnIICrIII(ox)3] (M=Fe, In; H2sal2-trien=N,N′-disalicylidenetriethylenetetramine; ox=oxalate) in different solvents are reported. Two different oxalate networks have been obtained with the same templating cation (see figure).

    17. Zeolites

      Evolution of Surface Morphology with Introduction of Stacking Faults in Zeolites (pages 2220–2230)

      Neena S. John, Sam M. Stevens, Osamu Terasaki and Michael W. Anderson

      Version of Record online: 11 JAN 2010 | DOI: 10.1002/chem.200902101

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      Zeolites at fault! Surface morphology of MFI–MEL and FAU–EMT intergrowth zeolites has been investigated by atomic force microscopy and high-resolution SEM. Changes in the terrace spreading and growth with introduction of stacking faults by employing a co-templating technique give insights about the crystal growth mechanism (see graphic).

    18. Semiconductors

      Synthesis, Structures, and Properties of Fused Thiophenes for Organic Field-Effect Transistors (pages 2231–2239)

      Ying Liu, Chong-an Di, Chunyan Du, Yunqi Liu, Kun Lu, Wenfeng Qiu and Gui Yu

      Version of Record online: 11 JAN 2010 | DOI: 10.1002/chem.200902755

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      Sulfur–sulfur interactions: Compounds constituting a new series of fused thiophenes based on thieno[3,2-b]thiophene, dithieno[3,2-b:2′,3′-d]thiophene, and thieno[3,2-b]thieno[2′,3′:4,5]thieno[2,3-d]thiophene have been synthesized and characterized. Strong sulfur–sulfur interactions are present between the adjacent molecules (see picture).

    19. Alkyl Halides

      Facile Synthetic Access to Rhenium(II) Complexes: Activation of Carbon–Bromine Bonds by Single-Electron Transfer (pages 2240–2249)

      Yanfeng Jiang, Olivier Blacque, Thomas Fox, Christian M. Frech and Heinz Berke

      Version of Record online: 11 JAN 2010 | DOI: 10.1002/chem.200902600

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      A Re-run: The different reactivity of ReI compounds 1 and 2 toward carbon bromides such as CH2Br2, CHBr3, and allyl- or benzylbromide to yield ReII complexes 3, 6, and 7 and carbene compounds 4 and 5 (see scheme) have been explored.

    20. Self-Assembly

      Self-Assembly of Discrete Homochiral, Helical, Hydrogen-Bonded Nanocages: From Vesicles to Microspheres and Tubules Capable of Gelating Solvents (pages 2250–2257)

      Liwei Yan, Ying Xue, Ge Gao, Jingbo Lan, Fan Yang, Xiaoyu Su and Jingsong You

      Version of Record online: 11 JAN 2010 | DOI: 10.1002/chem.200902750

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      Shape-shifter: The non-amphiphilic, homochiral, helical hydrogen-bonded [2+3] nanocages, which are formed by self-assembly of the chiral tris-monodentate imidazolinyl ligands together with tartaric acid in a 2:3 ratio, can spontaneously aggregate into vesicles and further evolve into microspheres and tubules capable of gelating solvents (see graphic).

    21. Discotics

      Desymmetrization of 3,3′-Bis(acylamino)-2,2′-bipyridine-Based Discotics: The High Fidelity of Their Self-Assembly Behavior in the Liquid-Crystalline State and in Solution (pages 2258–2271)

      Michel H. C. J. van Houtem, Rafael Martín-Rapún, Jef A. J. M. Vekemans and E. W. Meijer

      Version of Record online: 22 DEC 2009 | DOI: 10.1002/chem.200902416

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      Disc jockey: Although one-third of the aliphatic part of large aromatic amide 3,3′-bis(acylamino)-2,2′-bipyridine-based discotics has been removed (see graphic), their appealing properties, such as very stable discotic mesophases, helical self-assembly, and amplification of chirality in solution, remain intact.

    22. Metallocenes

      Sandwich Compounds of Transition Metals with Cyclopolyenes and Isolobal Boron Analogues (pages 2272–2281)

      Tatyana N. Gribanova, Andrey G. Starikov, Ruslan M. Minyaev, Vladimir I. Minkin, Matthew R. Siebert and Dean J. Tantillo

      Version of Record online: 22 DEC 2009 | DOI: 10.1002/chem.200902004

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      A sandwich please: Metal sandwich compounds containing boranes (see figure) are characterized by using density functional theory calculations and their properties are contrasted with traditional hydrocarbon-based metallocenes.

    23. Coordination Chemistry

      Binuclear Uranium(VI) Complexes with a “Pacman” Expanded Porphyrin: Computational Evidence for Highly Unusual Bis-Actinyl Structures (pages 2282–2290)

      Qing-Jiang Pan, Grigory A. Shamov and Georg Schreckenbach

      Version of Record online: 11 JAN 2010 | DOI: 10.1002/chem.200902014

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      Unusual bimetallic uranium structures: Density functional theory was used to explore a series of mono- and bimetallic UVI complexes with a polypyrrolic ligand that possesses two separate coordination sites. We attempted to characterize reasonable pathways that produce T-shaped, butterfly-like and triangle-like binuclear UVI complexes.

    24. Electron Transfer

      On the Coherent Description of Diffusion-Influenced Fluorescence Quenching Experiments II: Early Events (pages 2291–2299)

      Gonzalo Angulo, Daniel R. Kattnig, Arnulf Rosspeintner, Günter Grampp and Eric Vauthey

      Version of Record online: 11 JAN 2010 | DOI: 10.1002/chem.200901693

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      The first stages of fluorescence quenching: From sub-picosecond to steady-state experiments, quenching by electron transfer can be explained using differential encounter theory. The solvent structure and hydrodynamic effects also have to be taken into account (see figure). The free-energy dependence of the reaction is also explained in the same terms.

    25. Nanocomposite Catalysts

      Binary Au/MWCNT and Ternary Au/ZnO/MWCNT Nanocomposites: Synthesis, Characterisation and Catalytic Performance (pages 2300–2308)

      Jayaprakash Khanderi, Rudolf C. Hoffmann, Jörg Engstler, Jörg J. Schneider, Jürgen Arras, Peter Claus and Gennady Cherkashinin

      Version of Record online: 22 DEC 2009 | DOI: 10.1002/chem.200901987

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      Gold deposits: A single-source precursor route to ZnO deposition followed by either citrate reduction or UV photoreduction of AuIII to deposit gold nanoparticles on either multiwalled carbon nanotubes (MWCNTs) or ZnO/MWCNT has been used to yield binary and ternary nanocomposites, Au/CNT and Au/ZnO/MWCNT, respectively (see figure).

    26. Dendrigraft polymers

      An Expeditious Multigram-Scale Synthesis of Lysine Dendrigraft (DGL) Polymers by Aqueous N-Carboxyanhydride Polycondensation (pages 2309–2316)

      Hélène Collet, Eddy Souaid, Hervé Cottet, André Deratani, Laurent Boiteau, Guy Dessalces, Jean-Christophe Rossi, Auguste Commeyras and Robert Pascal

      Version of Record online: 23 DEC 2009 | DOI: 10.1002/chem.200901734

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      Hard graft? Not at all! Five generations of DGL are easily prepared on a multigram scale by iterating steps i) and ii) with Nε-trifluoroacetyl-L-lysine-N-carboxyanhydride (1) to give densely branched poly(L-lysine) with moderate PI values and DPn values of up to 1000. The polycondensation is controlled by in situ spontaneous precipitation of protected DGL. The polycationic properties and biocompatibility of DGL are likely to give rise to various potential applications.

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    3. Inside Cover
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    5. Corrigendum
    6. News
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      Preview: Chem. Eur. J. 8/2010 (page 2321)

      Version of Record online: 8 FEB 2010 | DOI: 10.1002/chem.201090027

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