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Reiko Jennerjahn Irene Piras Ralf Jackstell Dr. Robert Franke Dr. Klaus‐Diether Wiese Dr. Matthias Beller Prof. Dr. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(26):6383-6388
A novel selective palladium catalyst system based on bidentate 2,2′‐heteroarylarylphosphines and p‐TsOH has been developed for hydroformylation reactions (see scheme). By applying optimal conditions good to excellent regioselectivity is obtained for the hydroformylation of aliphatic and aromatic olefins. It is shown that a low acid concentration is crucial for obtaining high degrees of the linear isomer.
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Benito Alcaide Prof. Dr. Pedro Almendros Dr. Rocío Carrascosa Dipl.‐Chem. Teresa Martínez del Campo Dipl.‐Chem. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(11):2496-2499
Positive discrimination : Chemo‐ and regioselective palladium‐catalyzed cycloetherification of allendiols, namely β,γ‐ and γ,δ‐allendiols, may occur by judicious choice of palladium‐catalyzed conditions owing to their potential ability to discriminate between both nucleophilic sites (see scheme).
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Bringing order : A new class of periodic mesoporous organosilicas (PMOs) with a urea‐bridged organosilica precursor under acid‐catalyzed and inorganic‐salt‐assisted conditions was obtained. The large‐pore hybrid materials have ordered mesostructure with uniform pore size distributions, which can be seen from the TEM images.
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Molecular architecture affects the properties of surface layers. Photosensitive silanes with branched architectures allow patterning and coupling of proteins and cells on surfaces while maintaining their biofunctional state. Attachment can be directed to the activated regions of irradiated substrates with high selectivity (see image of mouse fibroblasts).
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Chengfu Pi Dr. José Elguero Prof. Dr. Li Wan Dipl.‐Chem. Ibon Alkorta Prof. Dr. Wenjun Zheng Prof. Dr. Linhong Weng Zhenxia Chen Limin Wu Prof. Dr. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(27):6581-6585
Tin knows its oniums! An unusual nitride tetrastannylene and a stannylenated ammonium ion stabilized by a samarium tetradiazaphospholido counterion are the first examples of a tris(organostannylenyl)amine derivative and a divalent tin coordinate onium ion that incorporates 1,2,4‐diazaphospholide ligand (see figure).
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Zijian Zhang Miao Yang Dr. Xinjun Zhang Lichu Zhang Bo Liu Ping Zheng Wei Wang Prof. Dr. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(10):2352-2361
Let's stick together : The gelation ability of a dendritic gelator has been enhanced by its complexation with a polyelectrolyte (see figure). This concept provides a route to construct novel functional or ordered materials by complexation of other low‐molecular‐mass functional species with polyelectrolytes.
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Javier Garcia‐Barriocanal Dr. Alberto Rivera‐Calzada Dr. Maria Varela Dr. Zouhair Sefrioui Prof. Mario R. Díaz‐Guillén Karla J. Moreno Dr. José A. Díaz‐Guillén Enrique Iborra Prof. Antonio F. Fuentes Dr. Stephen J. Pennycook Dr. Carlos Leon Prof. Jacobo Santamaria Prof. 《Chemphyschem》2009,10(7):1003-1011
Towards cooler solid oxide fuel cells: Disorder and dimensionality (see picture) play an important role in determining ion mobility of bulk and artificially nanolayered materials and should be considered in the design of new electrolytes with enhanced conductivity.
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Gui‐Ge Hou Jian‐Ping Ma Ting Sun Yu‐Bin Dong Prof. Dr. Ru‐Qi Huang Prof. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(10):2261-2265
Squashy cage : A flexible, spongelike, and reversible metal‐binding Cu2L2 cage that can adjust its internal space in response to pyrazine and its derivatives based on a recognition sequence of pyrazine, 2,5‐dimethylpyrazine, and 2‐methylpyrazine (see figure) is described.
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Fundamental properties: The molar absorption coefficients of CdSe quantum rods are determined experimentally as a function of their dimensions (see figure). Far above the band gap a simple dependence on volume is seen. The behavior at the band gap manifests a concentration of oscillator strength with decreased diameter in agreement with strong quantum confinement behavior.
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Richard B. C. Jagt Dr. Rodolfo F. Gómez‐Biagi Mark Nitz Prof. 《Angewandte Chemie (International ed. in English)》2009,48(11):1995-1997
Tracking down potential killers : Strong host–guest interactions enable the facile combination of polycationic cyclodextrin binding motifs (blue) with fluorescent reporters (orange) tethered to a hydrophobic guest molecule (dark green). An array of supramolecular fluorescent receptors prepared by this modular approach was used for the pattern‐based recognition of negatively charged contaminants in the anticoagulant drug heparin.
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