Chemistry - A European Journal

Cover image for Vol. 17 Issue 18

April 26, 2011

Volume 17, Issue 18

Pages 4929–5207

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Inside Cover
    4. Graphical Abstract
    5. News
    6. Concept
    7. Communications
    8. Full Papers
    9. Preview
    1. Cover Picture: Targeted Cellular Uptake and siRNA Silencing by Quantum-Dot Nanoparticles Coated with β-Cyclodextrin Coupled to Amino Acids (Chem. Eur. J. 18/2011) (page 4929)

      Mei-Xia Zhao, Jin-Ming Li, Lingyan Du, Dr. Cai-Ping Tan, Dr. Qing Xia, Prof. Zong-Wan Mao and Prof. Liang-Nian Ji

      Article first published online: 15 APR 2011 | DOI: 10.1002/chem.201190087

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      siRNA was delivered by quantum dots (QDs) modified with functional molecules to silence targeted genes in cells. FITC-labeled siRNA was conjugated with QDs coated with β-cyclodextrin (β-CD) coupled to amino acids, and resulted in a decrease in the fluorescence intensity. In addition, siRNA was delivered into the cytoplasm of HeLa cells by endocytosis and then released to specifically silence the HPV18 E6 gene under action of the RISC enzyme. These QDs provide a bright and stable fluorescent signal for intracellular siRNA imaging. For more details see the Full Paper by Z.-W. Mao, Q. Xia et al. on page 5171 ff.

  2. Inside Cover

    1. Top of page
    2. Cover Picture
    3. Inside Cover
    4. Graphical Abstract
    5. News
    6. Concept
    7. Communications
    8. Full Papers
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    1. Inside Cover: Electron Exchange Columns through Entrapment of a Nickel Cyclam in a Sol–Gel Matrix (Chem. Eur. J. 18/2011) (page 4930)

      Dr. Yair Lavi, Dr. Ariela Burg, Dr. Eric Maimon and Prof. Dan Meyerstein

      Article first published online: 15 APR 2011 | DOI: 10.1002/chem.201190088

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      An electron exchange column… … has been developed using the unique redox properties of nickel–tetraazamacrocyclic complexes and the physical and chemical stability of ceramic materials. The complexes have been entrapped using a biphasic sol–gel method. For more details see the Full Paper by Dan Meyerstein et al. on page 5188 ff.

  3. Graphical Abstract

    1. Top of page
    2. Cover Picture
    3. Inside Cover
    4. Graphical Abstract
    5. News
    6. Concept
    7. Communications
    8. Full Papers
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    1. Graphical Abstract: Chem. Eur. J. 18/2011 (pages 4933–4941)

      Article first published online: 15 APR 2011 | DOI: 10.1002/chem.201190089

  4. News

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

    1. Top of page
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    4. Graphical Abstract
    5. News
    6. Concept
    7. Communications
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    1. Supramolecular Receptors

      Oligopyrrole Macrocycles: Receptors and Chemosensors for Potentially Hazardous Materials (pages 4946–4959)

      Dr. Brett M. Rambo and Prof. Dr. Jonathan L. Sessler

      Article first published online: 4 APR 2011 | DOI: 10.1002/chem.201100050

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      Sequestering, removal, and detection of hazardous materials: The ability to bind and subsequently sense radioactive and explosive materials is critical for protecting the environment and could prove useful in a variety of security-related applications. Oligopyrroles provide a versatile receptor platform that can be exploited for these purposes, as well as for the recognition of certain potentially hazardous anionic species. The unique electronic features of oligopyrroles make them particularly useful as colorimetric and fluorimetric chemosensors.

  6. Communications

    1. Top of page
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    4. Graphical Abstract
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    7. Communications
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    1. Cluster Compounds

      The Use of a Bis(phenylpyrazolyl)pyridyl Ligand to Prepare [Mn4] and [Mn10] Cage Complexes (pages 4960–4963)

      Dr. José Sánchez Costa, Gavin A. Craig, Dr. Leoní A. Barrios, Dr. Olivier Roubeau, Dr. Eliseo Ruiz, Silvia Gómez-Coca, Dr. Simon J. Teat and Dr. Guillem Aromí

      Article first published online: 25 MAR 2011 | DOI: 10.1002/chem.201003329

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      Rational design versus serendipity: The first two high-nuclearity MnII/III clusters with a novel extended bis(phenylpyrazolyl)pyridyl ligand (see graphic) are described in a promising route for the preparation of new magnetic coordination aggregates, differing from conventional methods involving small bridging ligands.

    2. Alkaline-Earth Metal Complexes

      Peralkylated Barium Complexes (pages 4964–4967)

      Dipl.-Chem. Olaf Michel, Prof. Dr. Karl W. Törnroos, Dr. Cäcilia Maichle-Mössmer and Prof. Dr. Reiner Anwander

      Article first published online: 4 APR 2011 | DOI: 10.1002/chem.201100460

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      Alkyl aluminate/gallate exchange: Homoleptic barium tetraethylaluminate, synthesized from [(Ba{N(SiHMe2)2}2)n] and AlEt3 according to an extended silylamide elimination protocol, can be efficiently converted into the respective tetraethylgallate complex by diethyl ether assisted [AlEt4]/[GaEt4] exchange. Distinct Group 13 metal–alkyl bonding is featured in polymeric and toluene-coordinated dibarium solid-state structures.

    3. Synthetic Methods

      Straightforward Synthesis of Bridged Azaoxa Skeletons: Gold-Catalyzed Aminoketalization of Garner’s Aldehyde-Derived Alkynes (pages 4968–4971)

      Prof. Dr. Benito Alcaide, Dr. Pedro Almendros and Dipl.-Chem. Rocío Carrascosa

      Article first published online: 24 MAR 2011 | DOI: 10.1002/chem.201100139

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      Building bridges with gold: Bridged azaoxa skeletons have been efficiently prepared from easily accessible alkynyloxazolidine substrates under mild reaction conditions (see scheme; Boc=tert-butoxycarbonyl). The reactions were found to proceed with complete control of the regio- and stereoselectivity of the products in the presence of a combined gold/silver and acid catalyst system.

    4. Nickel Catalysis

      Cross-Coupling of Aryl/Alkenyl Ethers with Aryl Grignard Reagents through Nickel-Catalyzed C[BOND]O Activation (pages 4972–4975)

      Lan-Gui Xie and Prof. Dr. Zhong-Xia Wang

      Article first published online: 1 MAR 2011 | DOI: 10.1002/chem.201003731

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      The formation of a C[BOND]C bond has been achieved through the cleavage of the sp2 C[BOND]O bond of aryl/alkenyl ethers catalyzed by a nickel complex, and by using Grignard reagents as nucleophiles (see scheme). This method displays a broad substrate scope and leads to good to excellent yields of the aryl–aryl or alkenyl–aryl cross-coupling products.

    5. Cyclization Reactions

      Selectivity Manipulation of Bicyclization Reactions of 1,5-Bis(1,2-allenylketone)s: Pd versus Rh and Electronic Effect (pages 4976–4980)

      Dr. Youqian Deng, Prof. Dr. Chunling Fu and Prof. Dr. Shengming Ma

      Article first published online: 23 MAR 2011 | DOI: 10.1002/chem.201003546

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      Select Rh! The rhodium(I)-catalyzed double cyclization of 1,5-bis(1,2-allenylketone)s gives TNF-α inhibitor (A)-type skeletons at room temperature in acetone or 1,2-dichloroethane (DCE, see scheme; Ts=Tosyl). Compared with [PdCl2(MeCN)2], [RhCl(CO)2]2 shows excellent selectivity towards the nonaromatic C[DOUBLE BOND]C bond. The selectivity of unsymmetrical substrates can be controlled by the electronic effect.

    6. Synthetic Methods

      Regio- and Stereoselective Construction of Highly Functionalized 3-Benzazepine Skeletons through Ring-Opening Cycloamination Reactions Catalyzed by Gold (pages 4981–4985)

      Xiangwei Du, Shuang Yang, Jingyu Yang and Prof. Dr. Yuanhong Liu

      Article first published online: 23 MAR 2011 | DOI: 10.1002/chem.201002502

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      Ring size under control: Highly functionalized 1-amino- or 1-hydroxy-1H-benzo[d]azepines have been prepared through a gold-catalyzed cyclization of (o-alkynyl)phenyl aziridines with heteronucleophiles. After removal of the phthalimido group, the products can be further transformed into 1H-benzo[d]azepin-1-ones (see scheme; IBX=2-iodoxybenzoic acid, Phth=pthalimido).

    7. Carbocyclization Reactions

      Electrophilic Carbocyclization of Hydroxylated Enynes (pages 4986–4990)

      Dr. Fang Yang, Ke-Gong Ji, Hai-Tao Zhu, Ali Shaukat, Xue-Yuan Liu and Prof. Dr. Yong-Min Liang

      Article first published online: 22 MAR 2011 | DOI: 10.1002/chem.201003759

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      Mild, efficient, and clean! Six-membered cyclic products including diiodocyclohexadiene and 2,3-diiodobenzene have been prepared in a iodonium-induced internal carbocyclization of hydroxylated enynes (see scheme). This reaction proceeds smoothly under mild reaction conditions, and all the halogen atoms (I and Br) generated from the electrophiles are used effectively.

  7. Full Papers

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

      Nitrogen Dynamics and Reactivity of Chiral Aziridines: Generation of Configurationally Stable Aziridinyllithium Compounds (pages 4992–5003)

      Dr. Leonardo Degennaro, Dr. Rosmara Mansueto, Dr. Elisa Carenza, Dr. Rosanna Rizzi, Prof. Saverio Florio, Prof. Lawrence M. Pratt and Prof. Renzo Luisi

      Article first published online: 4 APR 2011 | DOI: 10.1002/chem.201003424

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      Nitrogen makes the difference! In contrast to α-lithiated oxazolinyloxiranes, chiral terminal oxazolinylaziridines furnish configurationally stable α-lithiated intermediates. This different behavior is rationalized on the basis of the dynamics of the aziridine nitrogen atom and DFT calculations. A dynamically controlled reactivity is proposed as a model to explain deprotonation and C[DOUBLE BOND]N addition that leads to enantioenriched oxazolinylaziridines or ketoaziridines (see scheme).

    2. Sensors

      Immobilization of DNA on Magnetic Microparticles for Mercury Enrichment and Detection with Flow Cytometry (pages 5004–5010)

      Po-Jung Jimmy Huang and Prof. Dr. Juewen Liu

      Article first published online: 23 MAR 2011 | DOI: 10.1002/chem.201002934

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      Mercury sensors: Immobilization of a mercury-binding DNA species on a magnetic microparticle (MMP) allows highly sensitive mercury detection in water by using flow cytometry (see figure). The immobilized sensor shows active mercury adsorption and can be easily regenerated.

    3. Fluorophores

      N-2-Aryl-1,2,3-triazoles: A Novel Class of UV/Blue-Light-Emitting Fluorophores with Tunable Optical Properties (pages 5011–5018)

      Wuming Yan, Qiaoyi Wang, Prof. Dr. Quan Lin, Prof. Dr. Minyong Li, Prof. Dr. Jeffrey L. Petersen and Prof. Dr. Xiaodong Shi

      Article first published online: 22 MAR 2011 | DOI: 10.1002/chem.201002937

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      Into the blue: A new class of UV/blue-light-emitting fluorophores is presented. The N-2-aryl-1,2,3-triazoles (NATs; see picture) showed strong fluorescence emission and high efficiency in various solvents, depending on the substitution pattern on the aryl moieties. A conjugation of the NAT scaffold with lysine led to a promising class of fluorophores for biological, medicinal, and material research probes.

    4. Cage Compounds

      A Facile Route to Difunctionalized Monosubstituted Octasilsesquioxanes (pages 5019–5023)

      Dr. Hongzhi Liu, Michael Puchberger and Ulrich Schubert

      Article first published online: 30 MAR 2011 | DOI: 10.1002/chem.201002940

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      Make it POSS-ible: A series of novel difunctionalized monosubstituted polyhedral oligomeric silsesquioxanes (POSS) substituted with various functional organic groups (X) were synthesized from a mono(iodopropyl)-substituted T8 cluster (see scheme; R=iBu). These new cage compounds are versatile nanoscale building blocks for the preparation of organic–inorganic hybrid materials.

    5. Radical Ion Pair State

      Synthesis, Characterization, and Photoinduced Energy and Electron Transfer in a Supramolecular Tetrakis (Ruthenium(II) Phthalocyanine) Perylenediimide Pentad (pages 5024–5032)

      Angel J. Jiménez, Dr. Bruno Grimm, Victoria L. Gunderson, Michael T. Vagnini, Sandra Krick Calderon, Dr. M. Salomé Rodríguez-Morgade, Prof. Dr. Michael R. Wasielewski, Prof. Dr. Dirk M. Guldi and Prof. Dr. Tomás Torres

      Article first published online: 22 MAR 2011 | DOI: 10.1002/chem.201002963

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      Donor/acceptor hybrids: The supramolecular attachment of four RuII phthalocyanines to the 1,6,7,12-bay positions of a perylenediimide renders [PDIpy4{Ru(CO)Pc}4] (see figure), which shows strong electronic coupling between the donor [Ru(CO)Pc] and the acceptor PDIpy4 parts, in both the ground and excited states. Photoexcitation of either chromophore (see blue arrows for photoexcitation of [Ru(CO)Pc] and red arrows for photoexcitation of PDIpy4) produces a radical ion pair state.

    6. Rare Earth Polyhydrides

      Synthesis and Structures of the C5Me4SiMe3-Supported Polyhydride Complexes over the Full Size Range of the Rare Earth Series (pages 5033–5044)

      Dr. Masayoshi Nishiura, Dr. Jens Baldamus, Dr. Takanori Shima, Kyouichi Mori and Prof. Dr. Zhaomin Hou

      Article first published online: 1 APR 2011 | DOI: 10.1002/chem.201002998

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      From two to eight! Tetranuclear octahydride complexes of a general formula [{(Cp′)Ln(μ-H)2}4(thf)x] (x=0, 1, 2; Cp′=C5Me4SiMe3) over the whole size range of the rare earth series have been obtained as self-assemblies of the dihydride species {(Cp′)LnH2}, resulting from the hydrogenolysis of their dialkyl precursors. The fine structures of these hydride clusters are dependent on the size of the metal ions. Some examples (core structures) are shown here.

    7. Olefin Metathesis

      Olefin Metathesis Featuring Ruthenium Indenylidene Complexes with a Sterically Demanding NHC Ligand (pages 5045–5053)

      César A. Urbina-Blanco, Anita Leitgeb, Prof. Dr. Christian Slugovc, Dr. Xavier Bantreil, Dr. Hervé Clavier, Prof. Dr. Alexandra M. Z. Slawin and Prof. Dr. Steven P. Nolan

      Article first published online: 23 MAR 2011 | DOI: 10.1002/chem.201003082

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      Is bigger better? Two new ruthenium indenylidene complexes featuring the sterically demanding 1,3-bis(2,6-diisopropylphenyl)-4,5-dihydroimidazol-2-ylidene (SIPr) have been prepared and characterized (see scheme; Ru violet, Cl green, N blue, C black). The use of these complexes in ring-closing, enyne, and cross metathesis of olefins led to remarkable activity at low catalyst loadings.

    8. Ionic Liquids

      Copper(I)-Containing Ionic Liquids for High-Rate Electrodeposition (pages 5054–5059)

      Dr. Neil R. Brooks, Stijn Schaltin, Dr. Kristof Van Hecke, Prof. Luc Van Meervelt, Prof. Koen Binnemans and Prof. Jan Fransaer

      Article first published online: 17 MAR 2011 | DOI: 10.1002/chem.201003209

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      Liquid metal salts: New metal-containing ionic liquids [Cu(CH3CN)n][Tf2N] (n=2, 4; Tf2N=bis(trifluoromethylsulfonyl)amide; see figure) have been synthesised and used as a non-aqueous electrolyte for the electrodeposition of copper to give current densities of greater than 25 A dm−2.

    9. Computational Chemistry

      Quantum Chemical Studies of the Hydration of Sr2+ in Vacuum and Aqueous Solution (pages 5060–5067)

      Andrew Kerridge and Nikolas Kaltsoyannis

      Article first published online: 23 MAR 2011 | DOI: 10.1002/chem.201003226

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      Just add water: The geometries and thermodynamic properties of gas-phase and bulk solvated hydrates of Sr2+ are modelled quantum chemically (see figure). Excellent agreement is obtained with experimental data obtained previously from a range of techniques.

    10. Crystal Engineering

      Selective Synthesis of Fe7Se8 Polyhedra with Exposed High-Index Facets and Fe7Se8 Nanorods by a Solvothermal Process in a Binary Solution and Their Collective Intrinsic Properties (pages 5068–5075)

      Dr. Min-Rui Gao, Zhao-Yang Lin, Dr. Jun Jiang, Hong-Bin Yao, Yong-Ming Lu, Qiang Gao, Wei-Tang Yao and Prof. Dr. Shu-Hong Yu

      Article first published online: 23 MAR 2011 | DOI: 10.1002/chem.201002203

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      In good shape: Uniform hexagonal Fe7Se8 polyhedra and Fe7Se8 nanorods (see picture) have been synthesized by a simple solvothermal reaction. The final morphology is strongly related to the volume ratio of the mixed amine/water solvent. The materials show weak ferromagnetism at 300 K and the nanocrystals exhibit photoluminescence emission at 403 nm.

    11. Protonation

      Protonation of Water Clusters Induced by Hydroperoxyl Radical Surface Adsorption (pages 5076–5085)

      Dr. Miquel Torrent-Sucarrat, Dr. Manuel F. Ruiz-Lopez, Dr. Marilia Martins-Costa, Prof. Joseph S. Francisco and Dr. Josep M. Anglada

      Article first published online: 23 MAR 2011 | DOI: 10.1002/chem.201002706

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      Outside looking in: The hydroperoxyl radical interacts on the surface of the (H2O)21 cluster, thereby facilitating water autoionization in the cluster and producing HO2 acid dissociation (see picture).

    12. Conjugated Systems

      1,4-Dialkynylbutatrienes: Synthesis, Stability, and Perspectives in the Chemistry of carbo-Benzenes (pages 5086–5100)

      Dr. Valérie Maraval, Dr. Léo Leroyer, Dr. Aya Harano, Cécile Barthes, Alix Saquet, Carine Duhayon, Prof. Teruo Shinmyozu and Prof. Remi Chauvin

      Article first published online: 22 MAR 2011 | DOI: 10.1002/chem.201002769

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      Conjugated carbomers: “Weakly-capped” diethynylbutatrienes, the three-edge motifs of carbo-benzenes, are prepared by either reductive elimination from 3,6-dioxyocta-1,4,7-triyne precursors, or reductive coupling of gem-dihaloenyne moieties (see figure). Their spectroscopic and electrochemical properties are analyzed on the basis of the relative extent of conjugation.

    13. Metal–Organic Frameworks

      Enhancing Gas Adsorption and Separation Capacity through Ligand Functionalization of Microporous Metal–Organic Framework Structures (pages 5101–5109)

      Dr. Yonggang Zhao, Haohan Wu, Dr. Thomas J. Emge, Qihan Gong, Nour Nijem, Prof. Dr. Yves J. Chabal, Dr. Lingzhu Kong, Prof. Dr. David C. Langreth, Hui Liu, Prof. Dr. Heping Zeng and Prof. Dr. Jing Li

      Article first published online: 23 MAR 2011 | DOI: 10.1002/chem.201002818

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      Selective CO2uptake: Functionalization of microporous metal–organic framework structures by selected chemical groups leads to significantly enhanced gas adsorption and separation capacity.

    14. Enantiomers

      Towards the Limit of Atropochiral Stability: H-MIOP, an N-Heterocyclic Carbene Precursor and Cationic Analogue of the H-MOP Ligand (pages 5110–5115)

      Dr. Ibrahim Abdellah, Dr. Martial Boggio-Pasqua, Dr. Yves Canac, Dr. Christine Lepetit, Carine Duhayon and Prof. Remi Chauvin

      Article first published online: 23 MAR 2011 | DOI: 10.1002/chem.201100205

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      MIOP-ic view: The enantiospecific preparation of H-MIOP, an atropochiral N-heterocyclic carbene (NHC)–phosphine ligand precursor and cationic analogue of the H-MOP ligand (see scheme; Tr=racemization temperature), is reported. The configurational stability of (R)- and (S)-H-MIOP furthers the fundamental appraisal of molecular atropochirality.

    15. Donor–Acceptor Systems

      Synthesis of Redox-Active, Intramolecular Charge-Transfer Chromophores by the [2+2] Cycloaddition of Ethynylated 2H-Cyclohepta[b]furan-2-ones with Tetracyanoethylene (pages 5116–5129)

      Dr. Taku Shoji, Junya Higashi, Prof. Dr. Shunji Ito, Dr. Tetsuo Okujima, Prof. Dr. Masafumi Yasunami and Prof. Dr. Noboru Morita

      Article first published online: 30 MAR 2011 | DOI: 10.1002/chem.201003628

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      Colorful chemistry: A series of 2H-cyclohepta[b]furan-2-one-substituted tetracyanobutadienes (TCBDs) were synthesized in one step by the [2+2] cycloaddition of tetracyanoethylene with the corresponding acetylene derivatives (see scheme). These new TCBDs were characterized by strong intramolecular charge-transfer absorptions in the UV/Vis spectra.

    16. Organocatalysis

      Lewis Base Catalyzed [4+2] Annulation of Electron-Deficient Chromone-Derived Heterodienes and Acetylenes (pages 5130–5137)

      Dipl.-Chem. Heiko Dückert, Dr. Vivek Khedkar, Prof. Dr. Herbert Waldmann and Dr. Kamal Kumar

      Article first published online: 22 MAR 2011 | DOI: 10.1002/chem.201003572

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      Explore your deficiencies! Electron-deficient chromone heterodienes and electron-poor acetylenes undergo Lewis base catalyzed [4+2] annulation reactions to yield tricyclic benzopyrones inspired by natural products (see scheme: NTs=N-tosyl).

    17. Porous Materials

      Relationship between Channel and Sorption Properties in Coordination Polymers with Interdigitated Structures (pages 5138–5144)

      Yuh Hijikata, Dr. Satoshi Horike, Masayuki Sugimoto, Dr. Hiroshi Sato, Dr. Ryotaro Matsuda and Prof. Dr. Susumu Kitagawa

      Article first published online: 23 MAR 2011 | DOI: 10.1002/chem.201003734

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      The weakest link: Porous coordination polymers constructed from Zn2+ and isophthalate with three different linker bipyridyl-type ligands were synthesized (see figure). Variations in the linker provide a strategy for the design of microporous compounds with different flexibilities, microporous environments, and separation abilities.

    18. Photocatalysts

      Fe3O4/WO3 Hierarchical Core–Shell Structure: High-Performance and Recyclable Visible-Light Photocatalysis (pages 5145–5154)

      Dr. Guangcheng Xi, Dr. Bing Yue, Dr. Junyu Cao and Prof. Jinhua Ye

      Article first published online: 22 MAR 2011 | DOI: 10.1002/chem.201002229

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      Tungsten-clad iron: A solution epitaxial growth method has been developed for the fabrication of Fe3O4/WO3 photocatalysts. The core–shell structured photocatalysts (see picture) possess large surface-exposure area, high light-absorption efficiency, stable recyclability, and efficient charge-separation properties, which lead to its significantly enhanced photoelectrochemical and photocatalytic activities.

    19. Solvent Classification

      Classification of Organic Solvents Revisited by Using the COSMO-RS Approach (pages 5155–5164)

      Dr. Morgan Durand, Dr. Valérie Molinier, Prof. Werner Kunz and Prof. Jean-Marie Aubry

      Article first published online: 24 MAR 2011 | DOI: 10.1002/chem.201001743

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      A new approach for the classification of solvents is proposed, based solely on the molecular structure and relying on the “COnductor-like Screening MOdel for Real Solvents” (COSMO-RS), in which solvents are considered in their liquid state. This approach provides an a priori classification without requiring the knowledge of any experimental data and appears as a consistent tool for the design of new solvents and their formulation.

    20. Nanoparticles

      Development of Lipid Targeting Raman Probes for In Vivo Imaging of Caenorhabditis elegans (pages 5165–5170)

      Shobhit Charan, Dr. Fan-Ching Chien, Dr. Narendra Singh, Dr. Chiung-Wen Kuo and Dr. Peilin Chen

      Article first published online: 15 MAR 2011 | DOI: 10.1002/chem.201002896

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      A simple, sensitive, and highly specific targeting Raman probe has been developed to image living nematode Caenorhabditis elegans (see picture). Our strategy involves the fabrication of lipid targeting probes, which were incorporated into the intracellular intestinal granules of the C. elegans by incubating with Raman probes, resulting in the uptake of these Raman probes into the intestinal granule, thus allowing fast visualization of lipid droplets through the SERS imaging technique.

    21. Gene Delivery

      Targeted Cellular Uptake and siRNA Silencing by Quantum-Dot Nanoparticles Coated with β-Cyclodextrin Coupled to Amino Acids (pages 5171–5179)

      Mei-Xia Zhao, Jin-Ming Li, Lingyan Du, Dr. Cai-Ping Tan, Dr. Qing Xia, Prof. Zong-Wan Mao and Prof. Liang-Nian Ji

      Article first published online: 4 APR 2011 | DOI: 10.1002/chem.201003523

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      Quantum dots for gene-silencing: A class of quantum-dot (QD) nanoparticles coated with β-cyclodextrin (β-CD) coupled to amino acids with different surface charges (positive, negative, and neutral) was synthesized, characterized, and used to deliver siRNA. The QDs were localized in vesicles in the cytoplasm of the cells. The gene-silencing efficiency of QDs is slightly improved compared with existing transfection agents for the HPV18 E6 gene in HeLa cells.

    22. Photoluminescence

      Lanthanide-Containing Photoluminescent Materials: From Hybrid Hydrogel to Inorganic Nanotubes (pages 5180–5187)

      Yan Qiao, Yiyang Lin, Shaofei Zhang and Prof. Dr. Jianbin Huang

      Article first published online: 30 MAR 2011 | DOI: 10.1002/chem.201003255

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      Supramolecular hydrogels: Functional photoluminescent materials are emerging as a fascinating research subject with broad applicability. A luminescent organic–inorganic hybrid hydrogel was designed by using lanthanide–cholate supramolecular self-assembly, which creates well-defined 1D nanofibers. Photoluminescent oxysulfide inorganic nanotubes were synthesized for the first time based on a self-templating approach toward supramolecular hydrogels.

    23. Sol–Gel Processes

      Electron Exchange Columns through Entrapment of a Nickel Cyclam in a Sol–Gel Matrix (pages 5188–5192)

      Dr. Yair Lavi, Dr. Ariela Burg, Dr. Eric Maimon and Prof. Dan Meyerstein

      Article first published online: 4 APR 2011 | DOI: 10.1002/chem.201003451

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      All change! An electron exchange column was developed by using the unique redox properties of nickel–cyclam and nickel–trans-III-meso-5,7,7,12,14,14-hexamethyl-1,4,8,11-tetraazacyclotetradecane complexes and the physical and chemical stability of ceramic materials by using a sol–gel process to entrap the complexes. Parameters controlling the leaching were investigated. Redox cycles with the reducing agent ascorbic acid and persulfate as the oxidizing agent were performed.

    24. Supramolecular Chemistry

      Controlled Supramolecular Oligomerization of C3-Symmetrical Molecules in Water: The Impact of Hydrophobic Shielding (pages 5193–5203)

      Dr. Pol Besenius, Dr. Kelly P. van den Hout, Harald M. H. G. Albers, Dr. Tom F. A. de Greef, Luuk L. C. Olijve, Dr. Thomas M. Hermans, Bas F. M. de Waal, Paul H. H. Bomans, Dr. Nico A. J. M. Sommerdijk, Dr. Giuseppe Portale, Dr. Anja R. A. Palmans, Dr. Marcel H. P. van Genderen, Dr. Jef A. J. M. Vekemans and Prof. Dr. E. W. Meijer

      Article first published online: 22 MAR 2011 | DOI: 10.1002/chem.201002976

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      Chiral supramolecular oligomers of controlled shape in water: The aggregation concentration of amphiphilic C3-symmetrical discotics can be altered by modifying the number of secondary interactions and the solvophobic character of the polymerizing moieties (see picture). Hydrophobic shielding of the hydrogen-bonding motif in the core of the discotic is crucial for yielding stable, helical aggregates that are designed to be restricted in size through anti-cooperative, electrostatic repulsive interactions.

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    3. Inside Cover
    4. Graphical Abstract
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    6. Concept
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      Preview: Chem. Eur. J. 19/2011 (page 5207)

      Article first published online: 15 APR 2011 | DOI: 10.1002/chem.201190091

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