Chemistry - A European Journal

Cover image for Vol. 18 Issue 6

February 6, 2012

Volume 18, Issue 6

Pages 1545–1843

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Graphical Abstract
    4. Corrigendum
    5. News
    6. Concept
    7. Communications
    8. Full Papers
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    1. You have free access to this content
      Cover Picture: Dinucleosides with Non-Natural Backbones: A New Class of Ribonuclease A and Angiogenin Inhibitors (Chem. Eur. J. 6/2012) (page 1545)

      Dr. Joy Debnath, Prof. Swagata Dasgupta and Prof. Tanmaya Pathak

      Version of Record online: 27 JAN 2012 | DOI: 10.1002/chem.201290017

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      The introduction of a non-natural backbone into a dinucleoside has proven to be a good venture for the design of inhibitors with lower ionic character. The presence of the non-natural backbone with one carboxylic group was effective in increasing the inhibitory activity of the protein compared with the phosphate analogue. It is possible that this kind of modification can be utilized for the identification of potent inhibitors of ribonucleases. For more details see the Full Paper by T. Pathak, S. Dasgupta, and J. Debnath on page 1618 ff.

  2. Graphical Abstract

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

    1. Top of page
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    3. Graphical Abstract
    4. Corrigendum
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    6. Concept
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    1. You have free access to this content
      Corrigendum: Reactions of ZnR2 Compounds with Dibenzoyl: Characterisation of the Alkyl-Transfer Products and a Striking Product-Inhibition Effect (page 1557)

      Dr. Izabela Dranka, Marcin Kubisiak, Dr. Iwona Justyniak, Michał Lesiuk, Dominik Kubicki and Prof. Dr. Janusz Lewiński

      Version of Record online: 27 JAN 2012 | DOI: 10.1002/chem.201200103

      This article corrects:
  4. News

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

    1. Top of page
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    3. Graphical Abstract
    4. Corrigendum
    5. News
    6. Concept
    7. Communications
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    1. Energy Transfer

      Optical Antenna for Photofunctional Molecular Systems (pages 1564–1570)

      Dr. Katsuyoshi Ikeda and Dr. Kohei Uosaki

      Version of Record online: 13 JAN 2012 | DOI: 10.1002/chem.201102013

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      Photon manipulation: The interaction efficiency between photons and molecules can be enhanced by a transformation between free-propagating massless photons and “heavy” photons. Although such photon manipulation is realized by metallic optical antennas, chemical interactions at metal–molecule interfaces have to be controlled to increase the overall photochemical reaction efficiency.

  6. Communications

    1. Top of page
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    4. Corrigendum
    5. News
    6. Concept
    7. Communications
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    1. Molecular Chirality

      Active Conformation of Seven-Membered-Ring Benzolactams as New ACAT Inhibitors: Latent Chirality at N5 in the 1,5-Benzodiazepin-2-one Nucleus (pages 1572–1576)

      Hidetsugu Tabata, Naoya Wada, Yuko Takada, Jun Nakagomi, Tomohiro Miike, Dr. Hiroaki Shirahase, Dr. Tetsuta Oshitari, Prof. Dr. Hideyo Takahashi and Prof. Dr. Hideaki Natsugari

      Version of Record online: 28 DEC 2011 | DOI: 10.1002/chem.201103264

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      Nitrogen chirality: Potent new ACAT inhibitors with seven-membered-ring benzolactams as the core structures were first prepared, and the axial chirality recognized by the enzyme was clarified (e.g., 1; see scheme). The chirality at the axis (aS) of 1 controls the conformation of the entire lactam ring, causing the N5-CH3 to arrange in a pseudo-equatorial position (i.e., the amine at N5 is a chiral center with the S-configuration) both in the crystal state and in solution.

    2. Trifluoromethylation

      Oxidative Trifluoromethylation of Arylboronates with Shelf-Stable Potassium (Trifluoromethyl)trimethoxyborate (pages 1577–1581)

      Bilal A. Khan, Annette E. Buba and Prof. Dr. Lukas J. Gooßen

      Version of Record online: 11 JAN 2012 | DOI: 10.1002/chem.201102652

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      Introducing CF3: Arylboronic acid pinacol esters are converted into the corresponding benzotrifluorides with the easy-to-use one-component trifluoromethylating reagent potassium (trifluoromethyl)trimethoxyborate, mediated by copper acetate under an oxygen atmosphere (see scheme).

    3. Cross-Coupling

      Oxidative Mizoroki–Heck-Type Reaction of Arylsulfonyl Hydrazides for a Highly Regio- and Stereoselective Synthesis of Polysubstituted Alkenes (pages 1582–1585)

      Fu-Lai Yang, Xian-Tao Ma and Prof. Dr. Shi-Kai Tian

      Version of Record online: 17 JAN 2012 | DOI: 10.1002/chem.201103671

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      A useful source: Arylsulfonyl hydrazides have been identified as synthetically useful aryl sources for the Pd(OAc)2 catalyzed oxidative Mizoroki–Heck-type reaction under molecular oxygen to provide a convenient access to polysubstituted alkenes in a highly regio- and stereoselective manner (see scheme). The reaction well tolerates various functional groups such as alkoxy, halo, alcohol, carboxylic acid, ester, amide, sulfonamide, and sulfone.

    4. Photo-Fenton Chemistry

      Ultra-Low Concentration Monitoring of Catalytic Reactions in Photonic Crystal Fiber (pages 1586–1590)

      Dr. Ana M. Cubillas, Matthias Schmidt, Dr. Michael Scharrer, Dr. Tijmen G. Euser, Prof. Bastian J. M. Etzold, Dr. Nicola Taccardi, Prof. Peter Wasserscheid and Prof. Philip St. J. Russell

      Version of Record online: 11 JAN 2012 | DOI: 10.1002/chem.201102424

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      Photonic crystal fibers as microreactors: Photonic crystal fibers can be used as microreactors (see figure). As an example, the illustration shows the difference in size between a 10 cm cuvette (left), and a photonic crystal fiber (right; not to scale).

    5. Catalytic Arylation

      Copper(II)-Catalyzed Monoarylation of Vicinal Diols with Diaryliodonium Salts (pages 1591–1594)

      Dr. Masami Kuriyama, Norihisa Hamaguchi and Prof. Dr. Osamu Onomura

      Version of Record online: 11 JAN 2012 | DOI: 10.1002/chem.201102770

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      Selective and efficient: The copper(II)-catalyzed selective monoarylation of vicinal diols with diaryliodonium triflates was successfully developed. In this catalytic process high chemoselectivity was achieved, even in the presence of a 1:1 mixture of the 1,2-diol and the mono-ol, and a wide range of substrates was tolerated, giving the monoarylated products in good to excellent yields (see scheme).

    6. Quantum Dots

      Dramatically Enhanced Solid-State Electrochemiluminescence of CdTe Quantum Dots Composed with TiO2 Nanoparticles (pages 1595–1598)

      Dr. Shou-Nian Ding, Bu-Hong Gao, Dr. Dan Shan, Dr. Yue-Ming Sun and Dr. Serge Cosnier

      Version of Record online: 13 JAN 2012 | DOI: 10.1002/chem.201102118

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      Shining brightly: Several tens to hundreds of times enhanced solid-state electrochemiluminescence (ECL) of CdTe quantum dots (CdTe-QDs) was realized by combining them with TiO2 nanoparticles. The mechanism was due to the synergetic effect between titania and CdTe-QDs during the ECL process in H2O2 solution (see scheme).

    7. Fluorescent Probes

      Discovery of a Full-Color-Tunable Fluorescent Core Framework through Direct C[BOND]H (Hetero)arylation of N-Heterocycles (pages 1599–1603)

      Bo Liu, Zhi Wang, Ningjie Wu, Mingliang Li, Prof. Dr. Jingsong You and Prof. Dr. Jingbo Lan

      Version of Record online: 13 JAN 2012 | DOI: 10.1002/chem.201103329

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      All the colors of the rainbow! A full coverage of emission wavelengths in the visible region (405–616 nm) with large Stokes shifts in C3-Indo-Fluor may be straightforwardly and succinctly achieved by the palladium-catalyzed direct C[BOND]H arylation of indolizines at the C3 position of the pyrrole ring (see figure). The fluorophores have successfully marked A375 cells.

    8. Organic Synthesis

      Synthesis of Tetrasubstituted Furans by Palladium-Catalyzed Decarboxylative [3+2] Cyclization of Propargyl β-Keto Esters (pages 1604–1607)

      Prof. Dr. Masahiro Yoshida, Shoko Ohno and Prof. Dr. Kozo Shishido

      Version of Record online: 13 JAN 2012 | DOI: 10.1002/chem.201103246

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      The decarboxylative [3+2] cyclization reaction of propargyl β-keto esters with a palladium catalyst is described. Tetrasubstituted furans with a variety of substituents were conveniently synthesized with high efficiency (see scheme).

  7. Full Papers

    1. Top of page
    2. Cover Picture
    3. Graphical Abstract
    4. Corrigendum
    5. News
    6. Concept
    7. Communications
    8. Full Papers
    9. Preview
    1. Metal–Organic Frameworks

      Reversible Solvatomagnetic Switching in a Spongelike Manganese(II)–Copper(II) 3D Open Framework with a Pillared Square/Octagonal Layer Architecture (pages 1608–1617)

      Jesús Ferrando-Soria, Dr. Rafael Ruiz-García, Dr. Joan Cano, Dr. Salah-Eddine Stiriba, Julia Vallejo, Dr. Isabel Castro, Prof. Dr. Miguel Julve, Prof. Dr. Francesc Lloret, Prof. Dr. Pedro Amorós, Dr. Jorge Pasán, Prof. Dr. Catalina Ruiz-Pérez, Dr. Yves Journaux and Dr. Emilio Pardo

      Version of Record online: 19 JAN 2012 | DOI: 10.1002/chem.201103308

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      Molecular magnetic sponges: A new oxamato-based mixed-metal–organic framework (shown here) reversibly switches from a crystalline hydrated phase with long-range ferromagnetic ordering at a critical temperature (Tc) of 22.5 K to an amorphous dehydrated phase at Tc=2.3 K. The dehydration/rehydration process is accompanied by large changes in crystal volume (ca. 45 %) and color.

    2. Competitive Inhibition

      Dinucleosides with Non-Natural Backbones: A New Class of Ribonuclease A and Angiogenin Inhibitors (pages 1618–1627)

      Dr. Joy Debnath, Prof. Swagata Dasgupta and Prof. Tanmaya Pathak

      Version of Record online: 19 JAN 2012 | DOI: 10.1002/chem.201102816

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      Competitive inhibition: Backbone-modified dinucleosides with both nonpolar and polar linkers inhibit the ribonucleolytic activity of ribonuclease A and angiogenin (see scheme). Kinetic experiments and docking studies show these compounds directly interact with the ribonucleolytic site residues of the enzymes of interest.

    3. Gold Nanoparticles

      A Facile Synthesis of Dynamic Supramolecular Aggregates of Cucurbit[n]uril (n=5–8) Capped with Gold Nanoparticles in Aqueous Media (pages 1628–1633)

      Tung-Chun Lee and Dr. Oren A. Scherman

      Version of Record online: 3 JAN 2012 | DOI: 10.1002/chem.201102675

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      Supramolecular capping of cucurbit[n]uril (CB[n]), n=5–8, by narrowly dispersed gold nanoparticles has been achieved through a facile synthetic route with metastable gold nanoparticles as a labile intermediate. The resultant assemblies were stable in solution, and were found to form dynamic aggregates consisting of a controllable ratio of singly and doubly capped CB[n] (see figure).

    4. Antitumor Agents

      Thermodynamics of Translesion Synthesis across a Major DNA Adduct of Antitumor Oxaliplatin: Differential Scanning Calorimetric Study (pages 1634–1639)

      Jakub Florian and Prof. Dr. Viktor Brabec

      Version of Record online: 30 DEC 2011 | DOI: 10.1002/chem.201102425

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      Platinum drugs: Differential scanning calorimetry was used to determine the thermodynamic changes associated with translesion synthesis across major lesion induced in DNA by antitumor oxaliplatin (see graphic).

    5. Heck reaction

      tBu or not tBu? (pages 1640–1649)

      Dr. Sten O. Nilsson Lill, Dr. Per Ryberg, Prof. Dr. Tobias Rein, Evelina Bennström and Prof. Dr. Per-Ola Norrby

      Version of Record online: 5 JAN 2012 | DOI: 10.1002/chem.201102674

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      A Hamlet study: The regioselectivity in the palladium-catalyzed Heck reaction between an aryl halide and ethyl vinyl ether with different phosphine ligands PPhntBum (n=0–3, m=3−n) has been investigated both experimentally and computationally. The number m of tBu groups (see picture) in the ligand is found to strongly influence the regioselectivity, and the different transition states involved in this study are demystified.

    6. Quantum Dots

      β-Cyclodextrin/Glycyrrhizic Acid Functionalised Quantum Dots Selectively Enter Hepatic Cells and Induce Apoptosis (pages 1650–1658)

      Dr. Mei-Xia Zhao, Prof. Liang-Nian Ji and Prof. Zong-Wan Mao

      Version of Record online: 2 JAN 2012 | DOI: 10.1002/chem.201102795

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      Killer instinct: β-Cyclodextrin/glycyrrhizic acid (β-CD/GA) functionalised quantum dots (QDs) can induce apoptosis in hepatocarcinoma cells. They exhibited effective cell growth inhibition by triggering the G0/G1 phase arrest and inducing apoptosis through a reactive oxygen species (ROS) mediated mitochondrial dysfunction pathway (see graphic).

    7. Self-Assembly

      Large-Scale Honeycomb Microstructures Constructed by Platinum–Acetylide Gelators through Supramolecular Self-Assembly (pages 1659–1667)

      Xing-Dong Xu, Jing Zhang, Li-Jun Chen, Prof. Xiao-Li Zhao, Prof. De-Xian Wang and Prof. Hai-Bo Yang

      Version of Record online: 3 JAN 2012 | DOI: 10.1002/chem.201102743

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      Honey honey: A large-scale ordered honeycomb structure has been fabricated by the self-assembly of rod–coil organometallic gelators. Intermolecular hydrogen bonding played an essential role during the formation of supramolecular aggregates. This research may allow the construction of ordered microporous materials from simple organometallic building blocks through self-assembly strategies.

    8. Biosensors

      Nucleic Acid Functionalized Graphene for Biosensing (pages 1668–1673)

      Dr. Alessandra Bonanni, Dr. Adriano Ambrosi and Prof. Martin Pumera

      Version of Record online: 30 DEC 2011 | DOI: 10.1002/chem.201102850

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      Graphene design: Four different chemically modified graphenes were produced, characterized and used for the covalent immobilization of DNA probes. The impedimetric detection of DNA hybridization on these platforms was compared (see illustration). The best sensitivity and reproducibility was obtained when using electrochemically reduced graphene oxide. This platform was employed for the detection of DNA single nucleotide polymorphism.

    9. Phosphorus Heterocycles

      P[DOUBLE BOND]C Bonds as Building Blocks for Three- and Four-Membered Heterocyclic Cations: Synthesis, Structures and Mechanistic Studies (pages 1674–1683)

      Joshua I. Bates and Prof. Dr. Derek P. Gates

      Version of Record online: 2 JAN 2012 | DOI: 10.1002/chem.201101535

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      To 3 or not to 3? Phosphaalkenes react with H+ or Me+ to afford three-or four-membered rings, respectively (see scheme). The mechanism of formation for these unprecedented heterocycles involves an umpolung addition of each electrophile to the P[DOUBLE BOND]C bond. Notably, P[DOUBLE BOND]C bonds can also be used as building blocks for phosphirenium cations and the first diphosphetanium dication.

    10. Phototherapeutic Agents

      A Cyclodextrin-Based Nanoassembly with Bimodal Photodynamic Action (pages 1684–1690)

      Noufal Kandoth, Dr. Elisa Vittorino, Maria Teresa Sciortino, Tiziana Parisi, Ivana Colao, Dr. Antonino Mazzaglia and Prof. Salvatore Sortino

      Version of Record online: 30 DEC 2011 | DOI: 10.1002/chem.201101635

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      Bimodal anticancer therapy: A supramolecular nanoassembly based on cationic amphiphilic cyclodextrins incorporating two suitable photoactive units permits effective photogeneration of 1O2 and NO in cancer cells (see figure) and induces a remarkable level of cell mortality through bimodal photodynamic actions, as well as displaying imaging capacities.

    11. Sensors

      Fluorescent and Colorimetric Probes for Mercury(II): Tunable Structures of Electron Donor and π-Conjugated Bridge (pages 1691–1699)

      Xiaohong Cheng, Shuang Li, Huizhen Jia, Aoshu Zhong, Dr. Cheng Zhong, Prof. Jun Feng, Prof. Jingui Qin and Prof. Zhen Li

      Version of Record online: 5 JAN 2012 | DOI: 10.1002/chem.201102376

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      Revealing the toxin: Based on the protection reaction between ethanethiol and aldehyde, a new series of molecules were prepared to serve as new dual-channel chemosensors for Hg2+ ions. All probes displayed high sensitivity and selectivity for Hg2+ (see figure). One probe was successfully applied to the detection of Hg2+ in HeLa cells.

    12. Enzymatic Hydrolysis

      Monoesterase Activity of a Purple Acid Phosphatase Mimic with a Cyclam Platform (pages 1700–1710)

      Prof. Dr. Peter Comba, Prof. Dr. Lawrence R. Gahan, Prof. Dr. Graeme R. Hanson, Dr. Valeriu Mereacre, Dr. Christopher J. Noble, Prof. Dr. Annie K. Powell, Ion Prisecaru, Prof. Dr. Gerhard Schenk and Dr. Marta Zajaczkowski-Fischer

      Version of Record online: 10 JAN 2012 | DOI: 10.1002/chem.201100229

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      Enzyme models: A protonated cyclam platform helps to fix and activate phosphomonoester substrates through a dinuclear metal site (see figure) and leads to the first functional purple acid phosphatase (PAP) mimic.

    13. Kinetics

      Evidence for Alkene cis-Aminocupration, an Aminooxygenation Case Study: Kinetics, EPR Spectroscopy, and DFT Calculations (pages 1711–1726)

      Monissa C. Paderes, Lee Belding, Branden Fanovic, Prof. Travis Dudding, Prof. Jerome B. Keister and Prof. Sherry R. Chemler

      Version of Record online: 11 JAN 2012 | DOI: 10.1002/chem.201101703

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      Copper kinetics: The mechanism of the CuII carboxylate-promoted alkene aminooxygenation/cyclization reaction (see scheme) was studied using kinetics, EPR spectroscopy, UV/Vis spectroscopy and DFT calculations. Alkene cis-aminocupration was implicated as the rate-determining step. This is the first kinetic analysis of a copper(II) carboxylate promoted reaction in aprotic organic solvent.

    14. Fullerenes

      Synthesis and Photophysical Properties of Fullerene–Phthalocyanine–Porphyrin Triads and Pentads (pages 1727–1736)

      Dr. Roger F. Enes, Dr. Juan-José Cid, Anita Hausmann, Olga Trukhina, Dr. Andreas Gouloumis, Prof. Purificación Vázquez, Prof. José A. S. Cavaleiro, Prof. Augusto C. Tomé, Prof. Dirk M. Guldi and Prof. Tomás Torres

      Version of Record online: 3 JAN 2012 | DOI: 10.1002/chem.201102819

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      Photoactive fullerenes: Several fullerene–phthalocyanine–porphyrin triads and pentads, covalently connected, give rise upon excitation of their porphyrin components to a sequence of energy and charge-transfer reactions.

    15. Quantum Chemistry

      Assessing Metal–Metal Multiple Bonds in Cr[BOND]Cr, Mo[BOND]Mo, and W[BOND]W Compounds and a Hypothetical U[BOND]U Compound: A Quantum Chemical Study Comparing DFT and Multireference Methods (pages 1737–1749)

      Giovanni Li Manni, Allison L. Dzubak, Abbas Mulla, David W. Brogden, Prof. John F. Berry and Prof. Laura Gagliardi

      Version of Record online: 11 JAN 2012 | DOI: 10.1002/chem.201103096

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      From triple to quintuple: To gain insights into the trends in metal–metal multiple bonding among the Group 6 elements, density functional theory has been employed in combination with multiconfigurational methods (CASSCF and CASPT2) to investigate a selection of bimetallic, multiply bonded compounds (see figure).

    16. Hydrogen Storage

      Transition Metal Hydrazide-Based Hydrogen-Storage Materials: the First Atoms-In-Molecules Analysis of the Kubas Interaction (pages 1750–1760)

      Claire V. J. Skipper, Dr. Tuan K. A. Hoang, Prof. David M. Antonelli and Prof. Nikolas Kaltsoyannis

      Version of Record online: 3 JAN 2012 | DOI: 10.1002/chem.201102715

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      The interaction of H2 with molecular models of the binding sites in amorphous vanadium hydrazide gels is studied quantum chemically (see figure), with the dual aim of rationalising previously observed experimental data and of predicting future experimental directions.

    17. Azo Compounds

      Synthesis of Amphiphilic Azo-Anion-Radical Complexes of Chromium(III) and the Development of Ultrathin Redox-Active Surfaces by the Langmuir–Schaefer Technique (pages 1761–1771)

      Sucheta Joy, Dr. Prabir Pal, Dr. Tapan Kumar Mondal, Prof. Dr. G. B. Talapatra and Prof. Dr. Sreebrata Goswami

      Version of Record online: 11 JAN 2012 | DOI: 10.1002/chem.201102765

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      Film star: An amphiphilic system bearing a high-spin chromic ion (CrIII, S=3/2) that is coupled to three azo-anion-radical ligands (see figure) and its ability to form Langmuir–Schaefer films is presented. The spectroscopic and electrochemical properties of the amiphiphile in solution and on a thin film are discussed.

    18. Bonding Analysis

      Carbodiphosphorane Analogues E(PPh3)2 with E=C–Pb: A Theoretical Study with Implications for Ligand Design (pages 1772–1780)

      Dr. Nozomi Takagi, Dr. Ralf Tonner and Dr. Gernot Frenking

      Version of Record online: 11 JAN 2012 | DOI: 10.1002/chem.201100494

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      Strong donors: Quantum-chemical calculations suggest that the heavy Group 14 homologues of carbodiphosphoranes E(PPh3)2 (E=Si, Ge, Sn, Pb) are stable compounds featuring a divalent E(0) atom that is bonded through donor–acceptor interactions to the phosphane ligands. The molecules are strong donors that could become stabilized in transition metal or main group complexes.

    19. Photochemistry

      Syntheses, Properties, and Photoreactions of the Hybrid Molecules Consisting of a CoII Mononuclear Complex and Porphyrins (pages 1781–1788)

      Dr. Hiroki Kon and Dr. Toshi Nagata

      Version of Record online: 3 JAN 2012 | DOI: 10.1002/chem.201100502

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      Having a good Co: Hybrid molecules, consisting of CoII mononuclear complexes and porphyrins, catalyze the conversion of hydroquinone into quinone in CHCl3. Photoinduced electron transfer followed by a charge shift gives a CoI intermediate that reacts with CHCl3 to give the product.

    20. Donor–Acceptor Systems

      The Influence of Terminal Push–Pull Substitution on the Electronic Structure and Optical Properties of Pentacenes (pages 1789–1799)

      Dr. Christina Tönshoff  and Prof. Dr. Holger F. Bettinger 

      Version of Record online: 2 JAN 2012 | DOI: 10.1002/chem.201101036

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      Donor–acceptor substituted pentacenes were obtained by photolysis of α-diketone-bridged precursors. Their electronic properties can be tuned by varying the 2,3-R2-9,10-(OCH3)2 substitution pattern (R=OCH3, F, Br, CN). The terminal push–pull substitution realized for R=CN (see figure) results in considerable bathochromic shifts of the electronic transition energies.

    21. Nanocatalysis

      New Cu-Based Catalysts Supported on TiO2 Films for Ullmann SNAr-Type C[BOND]O Coupling Reactions (pages 1800–1810)

      Faysal Benaskar, Dr. Volker Engels, Prof. Dr. Evgeny V. Rebrov, Narendra G. Patil, Prof. Dr. Jan Meuldijk, Dr. Peter C. Thüne, Dr. Pieter C. M. M. Magusin, Brahim Mezari, Prof. Dr. Volker Hessel, Prof. Dr. Lumbertus A. Hulshof, Prof. Dr. Emiel J. M. Hensen, Dr. Andrew E. H. Wheatley and Prof. Dr. Jaap C. Schouten

      Version of Record online: 3 JAN 2012 | DOI: 10.1002/chem.201102151

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      Copper catalysts captured: The Ullmann-type C[BOND]O cross-coupling of potassium phenolate and 4-chloropyridine was successfully carried out by applying copper nanoparticles supported on both non-porous and mesoporous titania (see figure).

    22. Melamium Adducts

      Formation of Melamium Adducts by Pyrolysis of Thiourea or Melamine/NH4Cl Mixtures (pages 1811–1819)

      Nicole E. Braml, Dr. Andreas Sattler and Prof. Dr. Wolfgang Schnick

      Version of Record online: 5 JAN 2012 | DOI: 10.1002/chem.201101885

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      New C/N/H materials: Novel melamium adduct phases have been obtained from different precursors (see figure). A detailed structural and spectroscopic study of these compounds and of a melaminium adduct observed as a reaction intermediate has substantially increased our knowledge on the formation processes of melam in competition to melamine.

    23. Methane Photolysis

      Conversion of Methane into C1 Oxygenates by Deep-UV Photolysis on Solid Surfaces: Influence of the Nature of the Solid and Optimization of Photolysis Conditions (pages 1820–1825)

      Francesc Sastre, Prof. Dr. Vicente Fornés, Prof. Dr. Avelino Corma and Prof. Dr. Hermenegildo García

      Version of Record online: 3 JAN 2012 | DOI: 10.1002/chem.201102273

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      For richer, for pore-r: The influence of the type of solid, its mass, and the irradiation time on methane photolysis are reported. Medium-pore size zeolites were found to be among the most-efficient materials to promote this photochemical reaction.

    24. Hydroboration

      Reaction of a 6-Dimethylaminopentafulvene with the Mes2PCH2CH2B(C6F5)2 Frustrated Lewis Pair (pages 1826–1830)

      Dr. Bao-Hua Xu, Dr. Cornelia M. Mömming, Dr. Roland Fröhlich, Dr. Gerald Kehr and Prof. Dr. Gerhard Erker

      Version of Record online: 3 JAN 2012 | DOI: 10.1002/chem.201101937

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      Reacting with frustration: 6-Dimethylamino-6-methylpentafulvene reacts with the frustrated Lewis pair Mes2PCH2CH2B(C6F5)2 to give the unusual addition product A that is isomerized to B upon heating (see scheme).

    25. Biphasic Systems

      Insight into the Interactions That Control the Phase Behaviour of New Aqueous Biphasic Systems Composed of Polyethylene Glycol Polymers and Ionic Liquids (pages 1831–1839)

      Dr. Mara G. Freire, Jorge F. B. Pereira, Dr. María Francisco, Dr. Héctor Rodríguez, Prof. Luís Paulo N. Rebelo, Prof. Robin D. Rogers and Prof. João A. P. Coutinho

      Version of Record online: 3 JAN 2012 | DOI: 10.1002/chem.201101780

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      Distinct pairs: Aqueous biphasic systems composed of polyethylene glycol (PEG) polymers and ionic liquids show that certain pairs of components can induce phase separation in aqueous media when dissolved at appropriate concentrations (see picture). The phase behaviour is not a direct result of the formation of hydration complexes; yet, it is controlled by the interactions that occur between both solutes.

  8. Preview

    1. Top of page
    2. Cover Picture
    3. Graphical Abstract
    4. Corrigendum
    5. News
    6. Concept
    7. Communications
    8. Full Papers
    9. Preview
    1. You have free access to this content
      Preview: Chem. Eur. J. 7/2012 (page 1843)

      Version of Record online: 27 JAN 2012 | DOI: 10.1002/chem.201290020

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