化學(xué)

封面介紹：The cover picture shows the recognition of CH2Cl2molecules for hexaphenylbenzene bromide HBH in solid state (Atom colors: C, gray; Br, red; Cl, green; H, white). With propeller-like shape, hexaphenylbenzene bromides display different recognition abilities for guest molecules in solid state.HBH can encapsulate CH2Cl2or Et2O molecules selectively from different solvent systems. For DBH, the recognition pattern is dominated between themselves. In CH2Cl2/toluene/Et2O system, toluene molecule can be encapsulated selectively byMBH. In these supramolecular assemblies, bromine bonding plays an important role. More details are discussed in the article by Zhang et al. on page 1031-1036.

Bromine bonding induced selective recognition of different guests for hexaphenylbenzene bromides in the solid state

PENG Lian-hui, ZHU Peng-cheng, MENG Xiang-gao, et al.

With propeller-like shape, hexaphenylbenzene bromides display different recognition abilities for guest molecules in solid state. HBH can encapsulate CH2Cl2or Et2O molecules selectively from different solvent systems. For DBH, the recognition pattern is dominated between themselves. In CH2Cl2/toluene/Et2O system, toluene molecule can be encapsulated selectively by MBH. In these supramolecular assemblies, bromine bonding plays an important role.

hexaphenylbenzene; bromine bond; molecule recognition; supramolecular assembly

來源出版物：Chinese Journal of Chemistry, 2015, 33(9): 1031-1036聯(lián)系郵箱：ZHANG Chun, chunzhang@hust.edu.cn

封面介紹：For the first time, we studied the fluorescence quenching effect of Rhodanmine 6G molecules on two-dimensional crystals of Bi2Se3and suggested a possible quenching mechanism of resonance energy transfer. [Peng, Hailin et al. on page 944-948.]

二維Bi2Se3晶體對羅丹明6G分子的熒光猝滅效應(yīng)研究

吳金雄，劉忠范，彭海琳

首次研究了拓?fù)浣^緣體Bi2Se3二維晶體對其表面吸附的羅丹明6G分子的熒光猝滅效應(yīng)，證明薄層Bi2Se3可以有效猝滅羅丹明6G分子的熒光，且隨Bi2Se3二維晶體的厚度從單層增加到8層，熒光猝滅效應(yīng)增強(qiáng)，并初步探討了其熒光猝滅機(jī)理。

拓?fù)浣^緣體；二維晶體；熒光猝滅；Bi2Se3

來源出版物：化學(xué)學(xué)報(bào), 2015, 73(9): 944-948

聯(lián)系郵箱：彭海琳，hlpeng@pku.edu.cn

One-dimensional janus polymeric vehicles

Lü Dong-mei, NI Wei, LIANG Fu-xin, et al.

Abstract:We herein report a novel approach to fabricate poly(DVB-co-VBC) one-dimentional nanomaterials with varied composition. By adjusting the monomer DVB/VBC ratio and using inert solvents, after internal cavity of the nanotubes disappears and length of the nanotubes is decreased, thus nanorods are achieved. After quaternary ammoniation from the benzyl chloride group, the exterior surface becomes hydrophilic while the interiority preserves hydrophobic. The Janus nanorods can serve as a specific vehicle to selectively collect oils from their aqueous surroundings.

Keywords:poly(DVB-co-VBC); janus; nanotube; nanorod

來源出版物：Chinese Journal of Polymer Science, 2015, 33(9): 1344-1350

聯(lián)系郵箱：LIANG Fu-xin, liangfuxin@iccas.ac.cn

封面介紹：The oxidative C?H/C?H cross-coupling between two heteroarenes has attracted much attention in recent years. Various natural products, pharmaceuticals and organic functional materials can be rapidly synthesized by this powerful strategy. The C?H activation strategy has many advantages over traditional coupling reactions, such as atom economy, low cost and synthetic simplicity. However, there are still some problems with transition metal-catalyzed C?H/C?H crosscoupling. The major one is the use of stoichiometric amounts of metal oxidants, which limits its practicability. In this work, a palladium/copper-cocatalyzed oxidative C?H/C?H cross-coupling between two heteroarenes by using molecular oxygen as an oxidant has been developed to construct biheteroaryl motifs. As oxygen is a green and cheap oxidant, the current catalytic system would be emerged as a significant tool for constructing unsymmetrical biheteroaryls.

Oxygen as an oxidant in palladium/copper-cocatalyzed oxidative C-H/C-H cross-coupling between two heteroarenes

SHI Yang, WANG Zhen, CHENG Yang-yang, et al.

Abstract:The palladium/copper-cocatalyzed oxidative C-H/C-H cross-coupling between two heteroarenes by using molecular oxygen as an oxidant instead of metal oxidants has been developed for the first time to constructbiheteroaryl motifs. A relatively broad range of thiophenes, furans and indoles can smoothly couple with variousN-heteroarenes in satisfactory yields. This catalytic system with O2as the terminal oxidant offers clear advantages of economically feasible and eco-friendly processes.

Keywords:biheteroaryl; molecular oxygen; C?H/C?H cross-coupling; green chemistry

來源出版物：Science China: Chemistry, 2015, 58(8): 1292-1296聯(lián)系郵箱：YOU Jing-song, jsyou@scu.edu.c

封面介紹：On page 1265-1271, XU et al reported an endogenous element-label plus exogenous element-tag strategy for ICP-MS to screen and discriminate a family of important ultratrace biomolecules, with Se-label naturally occurring in the biomolecules as an identifier and CH3Hg-tag that can bind to seleno (SeCys) but not Se-containing (SeMet) fulfilling the task of discriminating seleno and Se-containing ones based on the Se and Hg signals on ICP-MS. The method was applied to screen and discriminate seleno and Se-containing proteins (peptides) in the water-soluble extracts of Se-enriched yeast, and seven seleno proteins were successfully detected.

硒-汞雙元素標(biāo)記策略識別硒蛋白/多肽

徐明，楊利民，王秋泉

摘要：提出并發(fā)展了一種基于電感耦合等離子體質(zhì)譜（ICP-MS）的雙元素標(biāo)簽標(biāo)記策略來選擇性識別和檢測硒蛋白/多肽，其中內(nèi)源元素硒（Se）作為硒蛋白/多肽分子的識別元素，外源元素汞（Hg）作為硒蛋白/多肽和含硒蛋白/多肽分子的區(qū)分元素。通過對硒代半胱氨酸（SeCys）和谷胱甘肽過氧化酶1（GPx1）兩種模型分子的研究，外源鄰羧基苯硫甲基汞（CH3Hg-THI）動(dòng)態(tài)解離的CH3Hg+能夠選擇性標(biāo)記硒代半胱氨酸殘基（SeCys）中硒醇基（—SeH），但不能標(biāo)記含硒蛋白/多肽分子的硒代蛋氨酸殘基（SeMet）中的—SeCH3，進(jìn)而依據(jù)Se和Hg的ICP-MS信號識別和檢測硒蛋白/多肽。本方法應(yīng)用于富硒酵母水溶性提取液的分析，結(jié)果表明，提取液中的硒蛋白/多肽能夠被有效識別和檢測，驗(yàn)證了Se-Hg雙元素標(biāo)簽標(biāo)記策略的發(fā)展是ICP-MS識別和檢測硒蛋白/多肽的一種可行且優(yōu)越的途徑。

關(guān)鍵詞：硒；汞；硒蛋白/多肽；電感耦合等離子體質(zhì)譜

來源出版物：分析化學(xué), 2015, 43(9): 1265-1271聯(lián)系郵箱：王秋泉，qqwang@xmu.edu.cn