Chemistry - A European Journal

Cover image for Vol. 18 Issue 17

April 23, 2012

Volume 18, Issue 17

Pages 5117–5439

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Graphical Abstract
    4. News
    5. Concept
    6. Communications
    7. Full Papers
    8. Preview
    1. You have free access to this content
      Cover Picture: Design, Synthesis, and Miniemulsion Polymerization of New Phosphonate Surfmers and Application Studies of the Resulting Nanoparticles as Model Systems for Biomimetic Mineralization and Cellular Uptake (Chem. Eur. J. 17/2012) (page 5117)

      Rüdiger Sauer, Dr. Pablo Froimowicz, Katrin Schöller, Jens-M. Cramer, Dr. Sandra Ritz, Dr. Volker Mailänder and Prof. Dr. Katharina Landfester

      Version of Record online: 16 APR 2012 | DOI: 10.1002/chem.201290065

      Thumbnail image of graphical abstract

      Organic chemistry meets materials and polymer sciences for the design and synthesis of a new family of functional surfmers used for decorating nanoparticles with phosphonate groups. In their Full Paper on page 5201 ff., P. Froimowicz, K. Landfester et al. show that the synthesized particles exhibit great potential for the application in biological studies, such as cellular uptake, and can also be used as templates for biomimetic mineralization at the nanoscale level.

  2. Graphical Abstract

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

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

    1. Top of page
    2. Cover Picture
    3. Graphical Abstract
    4. News
    5. Concept
    6. Communications
    7. Full Papers
    8. Preview
    1. Endohedral Metallofullerenes

      Endohedral Metallofullerenes—Filled Fullerene Derivatives towards Multifunctional Reaction Center Mimics (pages 5136–5148)

      Marc Rudolf, Dr. Silke Wolfrum, Prof. Dr. Dirk M. Guldi, Dr. Lai Feng, Dr. Takahiro Tsuchiya, Prof. Dr. Takeshi Akasaka and Prof. Dr. Luis Echegoyen

      Version of Record online: 29 MAR 2012 | DOI: 10.1002/chem.201102844

      Thumbnail image of graphical abstract

      Trapping charges: This concept article highlights the implementation of endohedral metallofullerenes as integrative components in solar energy conversion schemes (see figure).

  5. Communications

    1. Top of page
    2. Cover Picture
    3. Graphical Abstract
    4. News
    5. Concept
    6. Communications
    7. Full Papers
    8. Preview
    1. Magnetic Properties

      Salt-Effect-Based Synthesis and Anomalous Magnetic Properties of Rare-Earth Oxide Nanosheets with Sub-1 nm Thickness (pages 5150–5154)

      Dr. Qiang Zhang and Prof. Dr. Bing Yan

      Version of Record online: 19 MAR 2012 | DOI: 10.1002/chem.201103596

      Thumbnail image of graphical abstract

      Ultrathin sheets! The combination of the salt effect and an organic solution-phase method has been used to synthesize ultrathin rare earth oxide (RE2O3, RE=Gd, Ho, Y) nanosheets with controllable thickness in the sub-1 nm regime. Enhanced magnetization intensity has been observed at low temperature for colloidal Ho2O3 nanosheets, compared with bulk Gd2O3.

    2. Graphene

      Tuning of n- and p-Type Reduced Graphene Oxide Transistors with the Same Molecular Backbone (pages 5155–5159)

      Dr. Junghyun Lee, Eunhee Hwang, Eunkyo Lee, Dr. Sohyeon Seo and Prof. Hyoyoung Lee

      Version of Record online: 20 MAR 2012 | DOI: 10.1002/chem.201103554

      Thumbnail image of graphical abstract

      Play the field: A field-effect transistor using reduced graphene oxides was prepared through the reduction of graphene oxides connected between two electrodes. The use of pyrene with an electron-withdrawing group and an electron-donating group showed the p- and n-doping effects, respectively, while the pyrene backbone with no electron-withdrawing or -donating groups showed no doping effect.

    3. C[BOND]H Activation

      CDC Reactions of N-Aryl Tetrahydroisoquinolines Using Catalytic Amounts of DDQ: C[BOND]H Activation under Aerobic Conditions (pages 5160–5164)

      Kaliyamoorthy Alagiri, Pradeep Devadig and Dr. Kandikere R. Prabhu

      Version of Record online: 19 MAR 2012 | DOI: 10.1002/chem.201200100

      Thumbnail image of graphical abstract

      An oxidative cross-dehydrogenative coupling (CDC) reaction for the formation of C[BOND]C and C[BOND]P bonds is disclosed using a catalytic amount of DDQ (10 mol %) under aerobic conditions (see scheme). This unprecedented environmentally benign strategy of using AIBN (10 mol %) and molecular oxygen to regenerate DDQ exhibits a larger substrate scope. For the first time, an efficient utility of 4-hydroxycoumarins as pronucleophiles for CDC is presented.

    4. Nanostructures

      A New Vapor-Phase Hydrothermal Method to Concurrently Grow ZnO Nanotube and Nanorod Array Films on Different Sides of a Zinc Foil Substrate (pages 5165–5169)

      Dr. Haimin Zhang, Yibing Li, Dr. Porun Liu, Prof. Dr. Ying Li, Dr. Dongjiang Yang, Prof. Dr. Huagui Yang and Prof. Dr. Huijun Zhao

      Version of Record online: 19 MAR 2012 | DOI: 10.1002/chem.201200036

      Thumbnail image of graphical abstract

      Vertically aligned ZnO single-crystal nanotube/nanorod array films have been concurrently fabricated, respectively, on the top and bottom surfaces of a zinc foil substrate by a facile vapor-phase hydrothermal method, due to the unique vapor-phase reaction environment (see figure).

    5. C–H Activation

      Dual Catalysis: Combination of Photocatalytic Aerobic Oxidation and Metal Catalyzed Alkynylation Reactions—C[BOND]C Bond Formation Using Visible Light (pages 5170–5174)

      Prof. Dr. Magnus Rueping, Dr. René M. Koenigs, Dipl.-Chem. Konstantin Poscharny, David C. Fabry, Dr. Daniele Leonori and Dr. Carlos Vila

      Version of Record online: 16 MAR 2012 | DOI: 10.1002/chem.201200050

      Thumbnail image of graphical abstract

      Shedding new light on the right combination of catalysts: A new dual catalytic system for efficient C[BOND]H functionalization was developed. The appropriate choice of two metal catalysts allows the oxidative alkynylation of tertiary amines under mild and sustainable reaction conditions.

    6. Multicomponent Reactions

      One-Pot Three-Component Highly Selective Synthesis of Homoallylboronates by Using Metal-Free Catalysis (pages 5175–5179)

      Prof. Dr. Ismail Ibrahem, Dr. Palle Breistein and Prof. Dr. Armando Córdova

      Version of Record online: 15 MAR 2012 | DOI: 10.1002/chem.201103572

      Thumbnail image of graphical abstract

      Metal-free selectivity: The first metal-free one-pot three-component highly chemo- and regioselective catalytic synthesis of homoallylboranes using simple N-heterocyclic carbenes (NHC) and amines is presented. The catalytic reaction between B2(pin)2, α,β-unsaturated aldehydes and 2-(triphenylphosphoranylidene)acetate esters proceeds through a catalytic metal-free β-boration/Wittig cascade sequence (see scheme).

    7. Catalysis

      A Moisture- and Air-Stable Cationic Ruthenium Complex as Catalyst for Highly Atom-Economical Stereo- and Regioselective Vinylation of Azoles (pages 5180–5183)

      Uttam Kumar Das and Prof. Dr. Manish Bhattacharjee

      Version of Record online: 20 MAR 2012 | DOI: 10.1002/chem.201103424

      Thumbnail image of graphical abstract

      Vinylation of azoles: The cationic RuII complex, [RuCl(PPh3)(dppe)(CH3CN)2][BPh4], is an efficient catalyst for regio- and stereoselective vinylation of azoles by alkynes (dppe=diphenylphosphinoethane; see scheme). Only 0.5 mol % of the complex is required and the reactions do not require stringent exclusion of moisture and air.

    8. Asymmetric Catalysis

      Enantioselective Hydrosilylation with Chiral Frustrated Lewis Pairs (pages 5184–5187)

      Dr. Dianjun Chen, Valeri Leich, Fangfang Pan and Prof. Dr. Jürgen Klankermayer

      Version of Record online: 16 MAR 2012 | DOI: 10.1002/chem.201200244

      Thumbnail image of graphical abstract

      Frustrated partners: Based on an initial mechanistic investigation, enantioselective hydrosilylation of various imines was accomplished for the first time by using a novel chiral frustrated Lewis pair (FLP) catalyst. High enantioselectivities of up to 87 % were obtained demonstrating the effectiveness of these metal-free chiral catalysts for this transformation (see scheme).

    9. Organocatalysis

      Highly Enantioselective Proline-Catalysed Direct Aldol Reaction of Chloroacetone and Aromatic Aldehydes (pages 5188–5190)

      Ángel Martínez-Castañeda, Belén Poladura, Dr. Humberto Rodríguez-Solla, Dr. Carmen Concellón and Dr. Vicente del Amo

      Version of Record online: 20 MAR 2012 | DOI: 10.1002/chem.201103667

      Thumbnail image of graphical abstract

      Ready salted proline: The combination of proline and an achiral triazabicyclodecene-derived guanidinium salt permits, for the first time, the direct aldol reaction of chloroacetone and aromatic aldehydes (see scheme). The resulting chlorohydrins are formed with high regio-, diastereo- and enantioselectivity. This procedure is experimentally simple and green, working without solvent, in test tubes placed inside a standard laboratory fridge without agitation or mechanical stirring.

  6. Full Papers

    1. Top of page
    2. Cover Picture
    3. Graphical Abstract
    4. News
    5. Concept
    6. Communications
    7. Full Papers
    8. Preview
    1. Photocatalysis

      Sonochemical Synthesis of Ag/AgCl Nanocubes and Their Efficient Visible-Light-Driven Photocatalytic Performance (pages 5192–5200)

      Prof. Deliang Chen , Seung Hwa Yoo, Dr. Qingsong Huang, Ghafar Ali and Prof. Sung Oh Cho

      Version of Record online: 29 MAR 2012 | DOI: 10.1002/chem.201103787

      Thumbnail image of graphical abstract

      A one-step sonochemical approach was used to synthesize AgCl nanocubes containing a small amount of metal Ag species, without external heat treatment or reducing agents. The as-obtained Ag/AgCl hybrid structures can be used as an efficient plasmonic photocatalyst for decomposing dyes such as methyl orange (MO) and rhodamine B (RhB) under visible-light irradiation (see figure).

    2. Surface-Functionalized Nanoparticles

      Design, Synthesis, and Miniemulsion Polymerization of New Phosphonate Surfmers and Application Studies of the Resulting Nanoparticles as Model Systems for Biomimetic Mineralization and Cellular Uptake (pages 5201–5212)

      Rüdiger Sauer, Dr. Pablo Froimowicz, Katrin Schöller, Jens-M. Cramer, Dr. Sandra Ritz, Dr. Volker Mailänder and Prof. Dr. Katharina Landfester

      Version of Record online: 29 MAR 2012 | DOI: 10.1002/chem.201103256

      Thumbnail image of graphical abstract

      Functional surfmers: The specific design, synthesis, optimization, and application of a (dye-containing) surfmer family bearing phosphonic acid as the polar-head and methacrylamide as the polymerizable group enables the use of the subsequently synthesized latexes as model systems to study selective surface functionalization, surfmer copolymerization efficiency, and diverse ways to successfully exploit them in different fields such as biomimetic mineralization and cell uptake (see figure).

    3. Structure Elucidation

      Relative and Absolute Configuration of Vatiparol (1 mg): A Novel Anti-inflammatory Polyphenol (pages 5213–5221)

      Dr. Hui Ming Ge, Han Sun, Dr. Nan Jiang, Yan Hua Qin, Huan Dou, Tong Yan, Prof. Ya Yi Hou, Prof. Christian Griesinger and Prof. Ren Xiang Tan

      Version of Record online: 20 MAR 2012 | DOI: 10.1002/chem.201104078

      Thumbnail image of graphical abstract

      Only one milligram: Natural products offer opportunities for the discovery of molecules with potential pharmaceutical and agrochemical activities. We have developed a methodology that combines residual dipolar coupling based NMR spectroscopy and motif-inspired biological assessment (see figure). This allowed the identification of the bioactivity and the relative and absolute configurations of vatiparol from V. parvifolia using a 1 mg sample.

    4. Mesocrystals

      Monodisperse Mesocrystals of YF3 and Ce3+/Ln3+ (Ln=Tb, Eu) Co-Activated YF3: Shape Control Synthesis, Luminescent Properties, and Biocompatibility (pages 5222–5231)

      Dr. Sheng-Liang Zhong, Dr. Yang Lu, Dr. Min-Rui Gao, Dr. Shu-Juan Liu, Jun Peng, Le-Cheng Zhang and Prof. Dr. Shu-Hong Yu

      Version of Record online: 19 MAR 2012 | DOI: 10.1002/chem.201102840

      Thumbnail image of graphical abstract

      Spindle-like YF3, YF3:Ce3+and YF3:Ce3+/Ln3+(Ln=Tb, Eu) mesocrystals have been synthesized by a robust solvothermal route. The luminescent properties of these mesocrystals were carefully investigated and the cytotoxicity study revealed that these YF3-based nanocrystals are biocompatible for bio-applications such as cellular imaging.

    5. DNA Oligomers

      Electron Attachment to Solvated dGpdG: Effects of Stacking on Base-Centered and Phosphate-Centered Valence-Bound Radical Anions (pages 5232–5238)

      Prof. Jiande Gu, Prof. Guoming Liang, Dr. Yaoming Xie and Prof. Henry F. Schaefer III

      Version of Record online: 16 MAR 2012 | DOI: 10.1002/chem.201103850

      Thumbnail image of graphical abstract

      Four different patterns of the radical anions of the DNA oligomer dinucleoside phosphate deoxyguanylyl-3′,5′-deoxyguanosine (dGpdG) are found with density functional theory (see figure). The excess electron resides on the proton of the phosphate group (dGpH−dG), on the phosphate group (dGp.−dG), on the nucleobase at the 5′ position (dG.−pdG), or the nucleobase at the 3′ position (dGpdG.−).

    6. Artificial Photosynthesis

      Near-IR Excitation Transfer and Electron Transfer in a BF2-Chelated Dipyrromethane–Azadipyrromethane Dyad and Triad (pages 5239–5247)

      Dr. Mohamed E. El-Khouly, Anu N. Amin, Prof. Melvin E. Zandler, Prof. Shunichi Fukuzumi and Prof. Francis D'Souza

      Version of Record online: 13 MAR 2012 | DOI: 10.1002/chem.201103074

      Thumbnail image of graphical abstract

      Good combination! Photoinduced energy and electron transfer in a newly synthesized molecular dyad and triad (shown here) composed of a known photosensitizer, BF2-chelated dipyrromethane (BDP), covalently linked to its structural analogue, the near-IR-emitting sensitizer BF2-chelated tetraarylazadipyrromethane (ADP), is reported to mimic the events of the photosynthetic antenna-reaction center complexes.

    7. Hybrid Materials

      Synthesis of a Hierarchical Three-Component Nanocomposite Structure System with Enhanced Electrocatalytic and Photoelectrical Properties (pages 5248–5255)

      Dr. Zhenlu Zhao, Dr. Guo Zhang, Dr. Lei Sun, Prof. Ying Gao, Prof. Xiuyun Yang and Prof. Yunhui Li

      Version of Record online: 13 MAR 2012 | DOI: 10.1002/chem.201102512

      Thumbnail image of graphical abstract

      All in order: A hierarchical three-component nanocomposite structure system composed of graphene, TiO2, and Pd@Pt core–shell nanoparticles was designed and synthesized by a sequential strategy. This approach focuses on the construction of a monolithic structure rather than limited single-component counterparts and shows a remarkable improvement in the photoelectrical and electrocatalytic properties for the oxidation of methanol in comparison with the commercially available E-TEK Pt/C catalyst.

    8. Kinetic Resolution

      Asymmetric Hydrolytic Kinetic Resolution with Recyclable Macrocyclic CoIII–Salen Complexes: A Practical Strategy in the Preparation of (R)-Mexiletine and (S)-Propranolol (pages 5256–5260)

      Arghya Sadhukhan, Dr. Noor-ul H. Khan, Tamal Roy, Dr. Rukhsana I. Kureshy, Dr. Sayed H. R. Abdi and Dr. Hari C. Bajaj

      Version of Record online: 15 MAR 2012 | DOI: 10.1002/chem.201103574

      Thumbnail image of graphical abstract

      A peaceful resolution: The reactions of epoxides and glycidyl ethers with water in the presence of chiral macrocyclic salen complex 1 afforded chiral epoxides and diols by hydrolytic kinetic resolution in good-to-excellent yields and high ee.

    9. Hybrid Materials

      Calcium Carbonate–Gold Nanocluster Hybrid Spheres: Synthesis and Versatile Application in Immunoassays (pages 5261–5268)

      Juan Peng, Li-Na Feng, Prof. Kui Zhang, Dr. Xing-Hua Li, Dr. Li-Ping Jiang and Prof. Jun-Jie Zhu

      Version of Record online: 15 MAR 2012 | DOI: 10.1002/chem.201102876

      Thumbnail image of graphical abstract

      Hybrid spheres: A calcium carbonate/gold nanocluster (CaCO3/AuNC) hybrid material that exhibits porous structure, excellent biocompatibility, solubility in water, and degradability was synthesized. A versatile immunosensor for both fluorescent and electrochemical assay of a cancer biomarker (see figure) was developed by using the CaCO3/AuNC hybrid spheres as templates for a protein label.

    10. Nanostructures

      Ellipsoidal TiO2 Hierarchitectures with Enhanced Photovoltaic Performance (pages 5269–5274)

      Dr. Wenqin Peng, Dr. Masatoshi Yanagida, Dr. Han Chen  and Dr. Liyuan Han 

      Version of Record online: 20 MAR 2012 | DOI: 10.1002/chem.201102975

      Thumbnail image of graphical abstract

      Harvesting sunlight: Hierarchical TiO2 ellipsoids consisting of highly crystalline anatase nanorods have been prepared by a template-free hydrothermal method. These hierarchical nanostructures have both high dye loading and good light-scattering behavior, and as a result they exhibit enhanced light harvesting and power conversion efficiency in dye-sensitized solar cells compared to commercial TiO2 (see figure).

    11. Redox Chemistry

      Multielectron Redox Chemistry of a Neutral, NIR-Active, Indigo-Pillared ReI-Based Triangular Metalloprism (pages 5275–5283)

      Dibyendu Bhattacharya, Che-Hao Chang, Yu-Hsiang Cheng, Long-Li Lai, Hsiu-Yu Lu, Ching-Yao Lin and Kuang-Lieh Lu

      Version of Record online: 15 MAR 2012 | DOI: 10.1002/chem.201102087

      Thumbnail image of graphical abstract

      Metalloprismatic electron reservoir: The self-assembled, neutral, hexarhenium(I), triangular metalloprism compound shown in the picture exhibits strong NIR absorption. Its reversible electrochemical switching to polyanionic states through up to eight spatially separated, stepwise electron injections and interesting optical properties were investigated.

    12. Coordination Polymers

      Metamagnetism and Single-Chain Magnetic Behavior in a Homospin One-Dimensional Iron(II) Coordination Polymer (pages 5284–5289)

      Dr. Jan Boeckmann, Dr. Mario Wriedt and Prof. Dr. Christian Näther

      Version of Record online: 20 MAR 2012 | DOI: 10.1002/chem.201103416

      Thumbnail image of graphical abstract

      Magnetic attraction! A rational strategy to a 1D homospin FeII coordination polymer (see figure) is presented, in which metamagnetism and single-chain magnetic behavior coexists. The new compound is characterized by a critical field Hc of 0.13 T and a blocking temperature TB estimated to be about 5 K.

    13. Ionic Liquids

      Remarkable Sensitivity of the Electrochemical Reduction of Benzophenone to Proton Availability in Ionic Liquids (pages 5290–5301)

      Shu-Feng Zhao, Prof. Jia-Xing Lu, Prof. Alan M. Bond and Dr. Jie Zhang

      Version of Record online: 15 MAR 2012 | DOI: 10.1002/chem.201103365

      Thumbnail image of graphical abstract

      Sense and sensitivity: The electrochemical reduction of benzophenone in an ionic liquid was remarkably sensitive to the proton availability from either the ionic liquid itself or from adventitious water, but not to other properties of the ionic liquid. Consequently, the voltammetry of benzophenone provided a sensitive tool for the determination of proton availability in ionic liquids.

    14. Asymmetric Synthesis

      Double Stereodifferentiation in the Catalytic Asymmetric Aziridination of Imines Prepared from α-Chiral Amines (pages 5302–5313)

      Li Huang, Dr. Yu Zhang, Dr. Richard J. Staples, Dr. Rui H. Huang and Prof. William D. Wulff

      Version of Record online: 20 MAR 2012 | DOI: 10.1002/chem.201102520

      Thumbnail image of graphical abstract

      It's a match: The (S)-VANOL boroxinate catalyst gives high diastereoselection in aziridine formation with a variety of imines derived from (R)-α-methylbenzyl amine upon reaction with ethyl diazoacetate. High diastereoselection is also observed for aziridinations with secondary diazoacetamides; the (R)-imine is matched with the (S)-catalyst for some substrates and the (R)-catalyst for others, but all produce the same diastereomer (see scheme).

    15. Asymmetric Nucleophilic Monofluorobenzylation of Carbonyl Compounds: Synthesis of Enantiopure vic-Fluorohydrins and α-Fluorobenzylketones (pages 5314–5318)

      Prof. Dr. Yolanda Arroyo, Prof. Dr. M. Ascensión Sanz-Tejedor, Dr. Alejandro Parra and Prof. Dr. José Luis García Ruano

      Version of Record online: 19 MAR 2012 | DOI: 10.1002/chem.201103919

      Thumbnail image of graphical abstract

      Two from one: Asymmetric nucleophilic monofluoroalkylation of a range of aldehydes takes place with complete control of the facial selectivity and good anti-diastereoselectivity to yield easily separable mixtures of optically pure 1,2-fluorohydrin derivatives. α-Fluorobenzylketones can also be obtained (see scheme).

    16. Mesoporous Materials

      Branched Mesoporous Mn3O4 Nanorods: Facile Synthesis and Catalysis in the Degradation of Methylene Blue (pages 5319–5324)

      Zhongchao Bai, Bo Sun, Dr. Na Fan, Dr. Zhicheng Ju, Menghua Li, Prof. Liqiang Xu and Prof. Yitai Qian

      Version of Record online: 13 MAR 2012 | DOI: 10.1002/chem.201102944

      Thumbnail image of graphical abstract

      Rod of iron: γ-MnOOH nanorods were synthesized by a hydrothermal reaction, and branched mesoporous Mn3O4 nanorods with a hausmannite structure were obtained after thermal decomposition of these γ-MnOOH nanorods under a N2 atmosphere.

    17. Yttrium

      1H,89Y HMQC and Further NMR Spectroscopic and X-ray Diffraction Investigations on Yttrium-Containing Complexes Exhibiting Various Nuclearities (pages 5325–5334)

      Dr. Matthias W. Löble, María Casimiro, Dr. Dominique T. Thielemann, Dr. Pascual Oña-Burgos, Prof. Dr. Ignacio Fernández, Prof. Dr. Peter W. Roesky and Prof. Dr. Frank Breher

      Version of Record online: 15 MAR 2012 | DOI: 10.1002/chem.201102636

      Thumbnail image of graphical abstract

      The Ys and wherefores: 2D 1H,89Y heteronuclear shift correlation through scalar coupling was applied to the chemical-shift determination of a set of yttrium complexes with various nuclearities. Multinuclear NMR spectroscopy as a function of temperature, PGSE NMR diffusion experiments, heteronuclear NOE measurements, and X-ray crystallography were applied to determine the structures in solution and in the solid state.

    18. Catenanes

      The Nature of the [TTF].+⋅⋅⋅[TTF].+ Interactions in the [TTF]22+ Dimers Embedded in Charged [3]Catenanes: Room-Temperature Multicenter Long Bonds (pages 5335–5344)

      Marçal Capdevila-Cortada and Prof. Juan J. Novoa

      Version of Record online: 16 MAR 2012 | DOI: 10.1002/chem.201103550

      Thumbnail image of graphical abstract

      [3]Catenane6+complexes show the presence of a multicenter long bond between the tetrathiafulvalene (TTF) groups of the external rings. This long bond is stable at room temperature, because the thermal energy at this temperature is lower than the energy required to break any of the ring covalent bonds, but ceases to be stable, if the ring does not exist (see figure).

    19. Microporous Materials

      Nitrogen-Doped Carbon Monolith for Alkaline Supercapacitors and Understanding Nitrogen-Induced Redox Transitions (pages 5345–5351)

      Dr. Da-Wei Wang, Prof. Feng Li, Dr. Li-Chang Yin, Xu Lu, Dr. Zhi-Gang Chen, Prof. Ian R. Gentle, Prof. Gao Qing (Max) Lu and Prof. Hui-Ming Cheng

      Version of Record online: 14 MAR 2012 | DOI: 10.1002/chem.201102806

      Thumbnail image of graphical abstract

      N donates more: A nitrogen-doped carbon monolith was synthesized as a pseudo-capacitive electrode for use in alkaline supercapacitors. Treatment with ammonia expanded the micropore size distributions and increased the specific surface area of the nitrogen-doped carbon. Possible redox reaction paths were proposed based on the calculated redox affinity of different groups and surface analysis.

    20. Domino Reactions

      Double C[BOND]H Functionalization in Sequential Order: Direct Synthesis of Polycyclic Compounds by a Palladium-Catalyzed C[BOND]H Alkenylation–Arylation Cascade (pages 5352–5360)

      Prof. Dr. Hiroaki Ohno, Mutsumi Iuchi, Dr. Naoto Kojima, Prof. Dr. Takehiko Yoshimitsu, Prof. Dr. Nobutaka Fujii and Prof. Dr. Tetsuaki Tanaka

      Version of Record online: 15 MAR 2012 | DOI: 10.1002/chem.201103819

      Thumbnail image of graphical abstract

      Fused aromatic ring systems were easily constructed by C[BOND]H alkenylation and C[BOND]H arylation of aniline-derived dibromides (see scheme). The order of two oxidative addition steps and the regioselectivity of the first cyclization were successfully controlled. Introduction of heterocycles, such as benzofuran, benzothiophene, or indole moieties, into the substrates led to the efficient construction of highly fused heterocyclic aromatic ring systems through direct arylation with the heteroaromatic rings.

    21. Mesoporous Materials

      Mesoporous Au/TiO2 Nanocomposite Microspheres for Visible-Light Photocatalysis (pages 5361–5366)

      Guannan Wang, Xiaofei Wang, Prof. Junfeng Liu and Prof. Xiaoming Sun

      Version of Record online: 13 MAR 2012 | DOI: 10.1002/chem.201101410

      Thumbnail image of graphical abstract

      The golden globes: Mesoporous Au/TiO2 microspheres were synthesized by using an emulsion-based bottom-up self-assembly (EBS) of Au and TiO2 nanocrystals. High visible-light photoinduced degradation efficiency of organic compounds was ascribed to the strong surface plasmon resonance (SPR) absorption of the Au components.

    22. Nanostructures

      Synthesis of Porous Zinc Gallate Prisms Composed of Highly Oriented Nanoparticles by an In Situ Conversion Reaction (pages 5367–5373)

      Dr. Wenli Zhou, Dr. Xianfeng Yang, Lin Huang, Prof. Dr. Jing Wang, Prof. Dr. Jinke Tang and Hongbin Liang

      Version of Record online: 12 MAR 2012 | DOI: 10.1002/chem.201102673

      Thumbnail image of graphical abstract

      Oriented attachment: Porous sub-micrometer prisms assembled by highly oriented ZnGa2O4 nanoparticles are directly formed from the α-Ga2O3 raw materials by an in situ conversion reaction. The high orientation is attributed to extremely similar atomic arrangements of the Ga and O atoms in both the α-Ga2O3 and ZnGa2O4 crystals (see picture). The in situ conversion strategy is expected to be a general route for the fabrication of novel porous nanostructures in the future.

    23. Proteomics

      Charge-Site-Dependent Dissociation of Hydrogen-Rich Radical Peptide Cations upon Vacuum UV Photoexcitation (pages 5374–5383)

      Dr. James A. Madsen, Ryan R. Cheng, Tamer S. Kaoud, Prof. Kevin N. Dalby, Prof. Dmitrii E. Makarov and Prof. Jennifer S. Brodbelt

      Version of Record online: 16 MAR 2012 | DOI: 10.1002/chem.201103534

      Thumbnail image of graphical abstract

      Easy as 1, 9, 3: Vacuum ultraviolet photodissociation at 193 nm of hydrogen-rich radical peptide cations (see figure) generated by electron transfer reactions offers insight into the factors that drive radical- and photon-directed processes. The location of a basic Arg site influences photon-activated Cα[BOND]C(O) bond cleavages of singly charged peptide radical cations.

    24. Surface Chemistry

      Full Characterization of Colloidal Solutions of Long-Alkyl-Chain-Amine-Stabilized ZnO Nanoparticles by NMR Spectroscopy: Surface State, Equilibria, and Affinity (pages 5384–5393)

      Dr. Yannick Coppel, Dr. Grégory Spataro, Dr. Carole Pagès, Dr. Bruno Chaudret, Dr. André Maisonnat and Dr. Myrtil L. Kahn

      Version of Record online: 13 MAR 2012 | DOI: 10.1002/chem.201102050

      Thumbnail image of graphical abstract

      The long-chain home: The surface of ZnO nanoparticles stabilized by amines was fully characterized by NMR spectroscopy. The apparently simple stabilization of ZnO nanoparticles by amines turned out to be far more complex than thought.

    25. DNA

      Label-Free Detection of Nanomolar Unmodified Single- and Double-Stranded DNA by Using Surface-Enhanced Raman Spectroscopy on Ag and Au Colloids (pages 5394–5400)

      Dr. Evanthia Papadopoulou and Prof. Steven E. J. Bell

      Version of Record online: 20 MAR 2012 | DOI: 10.1002/chem.201103520

      Thumbnail image of graphical abstract

      Simply DNA: Single- and double-stranded DNA were shown to spontaneously adsorb to Ag and Au colloids. This allowed their intrinsic Raman signatures to be detected by SERS at ≥10−9M without labels or thiolation (see scheme). Spectra of model DNA sequences contained bands from all bases, and showed large systematic changes when the relative numbers of bases were altered or smaller differences if the order of bases was changed.

    26. Catalysis

      Mechanism of the Transition-Metal-Catalyzed Hydroarylation of Bromo-Alkynes Revisited: Hydrogen versus Bromine Migration (pages 5401–5415)

      Dr. Genping Huang, Bing Cheng, Liang Xu, Prof. Dr. Yahong Li and Prof. Dr. Yuanzhi Xia

      Version of Record online: 20 MAR 2012 | DOI: 10.1002/chem.201102692

      Thumbnail image of graphical abstract

      Hydroarylation mechanism: A comprehensive DFT/M06 study of the transition-metal-catalyzed hydroarylation of the 2-(haloethynyl)biphenyl derivatives of Fürstner et al. was carried out to better understand the observed divergence of InCl3, AuCl, and PtCl2-catalyzed reactions, and all possible pathways were compared. The results shed new light on the subtle difference of InCl3, AuCl, and PtCl2 catalysts as alkyne activators, and demonstrate the important role of the chloride ligand of the metal catalyst in intra- and intermolecular H-migrations (see scheme).

    27. Hydrogen-Bonded Radicals

      Geometric and Electronic Structures of Phenoxyl Radicals Hydrogen Bonded to Neutral and Cationic Partners (pages 5416–5429)

      Dr. Maylis Orio, Dr. Olivier Jarjayes, Dr. Benoit Baptiste, Dr. Christian Philouze, Dr. Carole Duboc, Jenny-Lee Mathias, Dr. Laurent Benisvy and Prof. Dr. Fabrice Thomas

      Version of Record online: 13 MAR 2012 | DOI: 10.1002/chem.201102854

      Thumbnail image of graphical abstract

      Phenol–benzimidazole conjugates which mimic the tyrosine–imidazole pair of photosystem II have been synthesised and oxidised. The properties of the resulting phenoxyl radicals, that is, their oxidation potentials, electronic structures and EPR g tensors (see figure), are subtly modulated by the charge and position of the hydrogen-bonding partner, the strength of the hydrogen-bonding interaction and the deviation from planarity of the molecule.

    28. Dye-Sensitized Solar Cells

      Thieno[3,4-b]thiophene-Based Organic Dyes for Dye-Sensitized Solar Cells (pages 5430–5437)

      Yung-Chung Chen, Hsien-Hsin Chou, Ming Chih Tsai, Sheng-Yu Chen, Jiann T. Lin, Ching-Fa Yao and Kellen Chen

      Version of Record online: 15 MAR 2012 | DOI: 10.1002/chem.201200012

      Thumbnail image of graphical abstract

      Two isomeric metal-free sensitizers containing an ethyl thieno[3, 4-b]thiophene-2-carboxylate (ETTC) entity in the conjugated spacer were used for dye-sensitized solar cells. The compounds absorb at longer wavelengths than their thiophene congeners due to the quinoid effect. Trends in both physical properties and the cell performance of the two ETTC isomers were established by systematic studies (see figure).

  7. Preview

    1. Top of page
    2. Cover Picture
    3. Graphical Abstract
    4. News
    5. Concept
    6. Communications
    7. Full Papers
    8. Preview
    1. You have free access to this content
      Preview: Chem. Eur. J. 18/2012 (page 5439)

      Version of Record online: 16 APR 2012 | DOI: 10.1002/chem.201290068

SEARCH

SEARCH BY CITATION