化学

化学

封面介绍：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

来源出版物：Chinese Journal of Chemistry, 2015, 33(9): 1031-1036联系邮箱：ZHANG Chun, chunzhang@hust.edu.cn

封面介绍：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.]

二维Bi2Se3晶体对罗丹明6G分子的荧光猝灭效应研究

吴金雄，刘忠范，彭海琳

首次研究了拓扑绝缘体Bi2Se3二维晶体对其表面吸附的罗丹明6G分子的荧光猝灭效应，证明薄层Bi2Se3可以有效猝灭罗丹明6G分子的荧光，且随Bi2Se3二维晶体的厚度从单层增加到8层，荧光猝灭效应增强，并初步探讨了其荧光猝灭机理。

拓扑绝缘体；二维晶体；荧光猝灭；Bi2Se3

来源出版物：化学学报, 2015, 73(9): 944-948

联系邮箱：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

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

联系邮箱：LIANG Fu-xin, liangfuxin@iccas.ac.cn

封面介绍：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

来源出版物：Science China: Chemistry, 2015, 58(8): 1292-1296联系邮箱：YOU Jing-song, jsyou@scu.edu.c

封面介绍：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-汞双元素标记策略识别硒蛋白/多肽

徐明，杨利民，王秋泉

摘要：提出并发展了一种基于电感耦合等离子体质谱（ICP-MS）的双元素标签标记策略来选择性识别和检测硒蛋白/多肽，其中内源元素硒（Se）作为硒蛋白/多肽分子的识别元素，外源元素汞（Hg）作为硒蛋白/多肽和含硒蛋白/多肽分子的区分元素。通过对硒代半胱氨酸（SeCys）和谷胱甘肽过氧化酶1（GPx1）两种模型分子的研究，外源邻羧基苯硫甲基汞（CH3Hg-THI）动态解离的CH3Hg+能够选择性标记硒代半胱氨酸残基（SeCys）中硒醇基（—SeH），但不能标记含硒蛋白/多肽分子的硒代蛋氨酸残基（SeMet）中的—SeCH3，进而依据Se和Hg的ICP-MS信号识别和检测硒蛋白/多肽。本方法应用于富硒酵母水溶性提取液的分析，结果表明，提取液中的硒蛋白/多肽能够被有效识别和检测，验证了Se-Hg双元素标签标记策略的发展是ICP-MS识别和检测硒蛋白/多肽的一种可行且优越的途径。

关键词：硒；汞；硒蛋白/多肽；电感耦合等离子体质谱

来源出版物：分析化学, 2015, 43(9): 1265-1271联系邮箱：王秋泉，qqwang@xmu.edu.cn