共查询到20条相似文献,搜索用时 15 毫秒
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Yasushi Yokoyama Prof. Dr. Tatsuya Shiozawa Yutaka Tani Dr. Takashi Ubukata Dr. 《Angewandte Chemie (International ed. in English)》2009,48(25):4521-4523
Into my arms : Photochemical cyclization of diarylethenes that have two chiral side arms showed up to 100 % de (see scheme). Introduction of these chiral side arms onto the carbon atoms where ring closure occurs is a general strategy for the highly diastereoselective cyclization of diarylethenes.
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María C. Bernini Felipe Gándara Marta Iglesias Dr. Natalia Snejko Dr. Enrique Gutiérrez‐Puebla Prof. Elena V. Brusau Dr. Griselda E. Narda Dr. M. Ángeles Monge Prof. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(19):4896-4905
The novel Yb succinate metal–organic framework exhibits a reversible single‐crystal to single‐crystal polymorphic transformation (see figure) when it is heated above 130 °C, returning to its initial form when back at room temperature. This transformation produces a change in the coordination sphere of the Yb atoms, which influences the catalytic activity of the material.
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Vaibhav M. Jadhav Vinod Scaria Dr. Souvik Maiti Dr. 《Angewandte Chemie (International ed. in English)》2009,48(14):2557-2560
Many important cellular processes are regulated by small endogenous noncoding RNAs known as microRNAs (miRNAs). The precise molecular function of many miRNAs is unknown; different loss‐of‐function methods are required to gain insight into the biology of these small RNA molecules. Nucleic acid enzymes termed antagomirzymes are now shown to be valuable tools for the specific knockdown of miRNA in vitro and in vivo (see scheme).
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Zhaohua Huang Dr. Mahmoud Reza Jaafari Dr. Francis C. Szoka Jr. Prof. 《Angewandte Chemie (International ed. in English)》2009,48(23):4146-4149
Extreme makeover of cholesterol : Cholesterol exchange is a major reason for the instability of liposomes in blood. The formation of a covalent hybrid between cholesterol and glycerophosphocholine preserves the bilayer‐stabilizing effect of free cholesterol but prevents its transfer from the bilayer. Thus, disterolphospholipids (e.g. 1 ) are valuable new components for liposome formulation.
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Venkatapuram Padmavathi Konda Mahesh Pinnu Thriveni Tippireddy Venkata Ramana Reddy 《Journal of heterocyclic chemistry》2007,44(5):1165-1169
A new class of 1,2,3‐selena/thiadiazoles and 2H‐diazaphospholes were synthesized by exploiting α‐ketomethylene group in phenacylsulfonylacetic acid methyl ester. 相似文献
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Henning A. Höppe Dr. 《Angewandte Chemie (International ed. in English)》2009,48(20):3572-3582
Energy efficiency is in! New inorganic luminescent materials can help to increase energy efficiency when used in plasma display panels and white‐light‐emitting diodes (see color diagram; mixing the three emissions A–C produces any given point within the triangle). In mercury‐free fluorescent lamps these phosphors might contribute to environmental protection, and they provide better scintillation materials for medical diagnostics.
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Xiukai Li Dr. Naoki Kikugawa Dr. Jinhua Ye Prof. Dr. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(14):3538-3545
Slip between the sheets! The intercalation properties of lamellar solid acids have a profound impact on nitrogen doping as well as on the resultant visible‐light photocatalysis, and the effects depend strongly on the protonic acidities of the samples (see figure).
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Masaki Shimizu Prof. Dr. Youhei Takeda Masahiro Higashi Tamejiro Hiyama Prof. Dr. 《Angewandte Chemie (International ed. in English)》2009,48(20):3653-3656
Minimum requirements : Crystals and thin films of 1,4‐bis(alkenyl)‐2,5‐dipiperidinobenzenes, which contain only one benzene ring as the aromatic component, emit visible light with excellent solid‐state quantum yields upon irradiation with UV light. Polystyrene thin films doped with the benzenes also exhibit brilliant fluorescence. By modifying the alkenyl groups, the emission color can be tuned in the range from blue to red.
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Anthony J. Zucchero Rebecca A. Shiels Psaras L. McGrier M. Alicia To Christopher W. Jones Prof. Uwe H. F. Bunz Prof. 《化学:亚洲杂志》2009,4(2):262-269
Silica scaffolding : By employing functionalized mesoporous SBA‐15 silica, novel fluorescent cruciform‐silica hybrid materials are generated which preserve the desirable solution properties of cruciforms in the solid state for potential use in sensory schemes.
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Achraf Ghorbal Dr. Federico Grisotto Julienne Charlier Dr. Serge Palacin Dr. Cédric Goyer Dr. Christophe Demaille Dr. 《Chemphyschem》2009,10(7):1053-1057
An electrochemical lithographic tool for locally electrografting a non‐conducting organic coating on a conducting substrate with a submicrometer resolution is provided by atomic force scanning electrochemical microscopy (AFM‐SECM). The picture shows the topographic AFM image of the line pattern drawn with an AFM‐SECM tip on a gold surface by direct reduction of an aryl diazonium salt/acrylic acid electrolyte solution.
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Osama Shekhah Dr. Hui Wang Denise Zacher Roland A. Fischer Prof. Christof Wöll Prof. 《Angewandte Chemie (International ed. in English)》2009,48(27):5038-5041
One step at a time : The in situ monitoring of the step‐by‐step formation of metal–organic frameworks (MOFs) by using surface plasmon resonance (SPR), allows the nucleation process and the formation of the secondary building units to be investigated. Growth rates on functionalized organic surfaces with different crystallographic orientations can also be studied.
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Liqing Ma Dr. Wenbin Lin Prof. 《Angewandte Chemie (International ed. in English)》2009,48(20):3637-3640
Stop the breathing : As the organic bridging ligands become more elaborate and large, the resulting MOFs tend to experience significant framework distortion (i.e., breathing) upon solvent removal. Rigidification of MOFs that are built from elongated tetracarboxylate bridging ligands by unusual interlocking and interpenetration leads to highly porous and robust hybrid materials.
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Guoyong Song Xingwei Li Prof. Dr. Zhongcheng Song Jing Zhao Prof. Dr. Hongjie Zhang Prof. Dr. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(22):5535-5544
Phosphine‐assisted C? H activation of the methyl group of 2‐methylimidazolium compounds led to a series of iridium, rhodium, and palladium complexes of 2‐methyleneimidazolines. Experimental results confirmed that the product of methyl C? H activation is the kinetic product, whereas the aryl C? H activation product is the thermodynamic product (see scheme).
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Christian Piontek Dr. Petra Ring Olaf Harjes Christian Heinlein Stefano Mezzato Dr. Nelson Lombana Claudia Pöhner Markus Püttner Dr. Daniel Varón Silva Dr. Andreas Martin Dr. Franz Xaver Schmid Prof. Carlo Unverzagt Prof. 《Angewandte Chemie (International ed. in English)》2009,48(11):1936-1940
Seven in one blow : The efficient formation of mixed disulfides on the thiol‐rich fusion protein A followed by subsequent intein cleavage gave the fragment B with all seven cysteines protected against oxidation. The native chemical ligation of B with synthetic glycopeptide thioesters provides glycoproteins.
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Xiaogang Liu Prof. 《Angewandte Chemie (International ed. in English)》2009,48(17):3018-3021
Hex nut : An emerging synthetic approach based on metal–organic coordination‐polymer templates has been used to fabricate micro‐ and nanoscale crystals. By using a diverse range of molecular building blocks coupled with conventional synthetic techniques, it is possible to synthesize ZnO crystals with tailored sizes, shapes (such as hexagonal rings; see figure), and surface properties.
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Bo Wu WeiWei Liu YuMei Zhang Dr. HuaPing Wang 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(8):1804-1810
Recycling of “green” solvents : Recycling of ionic liquids with high efficiency is of key importance on going from the laboratory‐scale to large‐scale industrial application of these solvents.