文献类型：期刊文献

英文题名：Conformer-dependent self-assembled metallacycles with photo-reversible response

作者：Li, Mengqi[1];Chen, Li-Jun[2];Zhang, Zhipeng[1];Luo, Qianfu[1];Yang, Hai-Bo[2];Tian, He[1];Zhu, Wei-Hong[1]

机构：[1]East China Univ Sci & Technol, Joint Int Res Lab Precis Chem & Mol Engn, Feringa Nobel Prize Scientist Joint Res Ctr,Shang, Key Lab Adv Mat,Inst Fine Chem,Sch Chem & Mol Eng, Shanghai 200237, Peoples R China;[2]East China Normal Univ, Sch Chem & Mol Engn, Chang Kung Chuang Inst, Shanghai Key Lab Green Chem & Chem Proc, Shanghai 200062, Peoples R China

年份：2019

卷号：10

期号：18

起止页码：4896

外文期刊名：CHEMICAL SCIENCE

收录：;EI(收录号：20192006916700);WOS:【SCI-EXPANDED(收录号:WOS:000468818700018)】；

基金：W.-H. Z acknowledges financial support from the NSFC for Science Center Program (21788102), Creative Research Groups (21421004) and Key Project (21636002), NSFC/China, the National key Research and Development Program (2016YFA0200300), the Shanghai Municipal Science and Technology Major Project (2018SHZDZX03), and the Program of Introducing Talents of Discipline to Universities (B16017). H.-B. Y acknowledges the financial support of NSFC/China (No. 21625202), the 973 Program (No. 2015CB856600), STCSM (No. 16XD1401000), and the Program for Changjiang Scholars and Innovative Research Team in University.

语种：英文

外文关键词：Platinum compounds - Photochromism - Light - Metals - Controlled drug delivery - Fatigue testing

摘要：Discrete, well-defined metallacycles and metallacages with stimuli-responsive behaviors have been largely predominated by the organic donor/metal acceptor paradigm with spontaneous formation of coordination bonds. However, light-driven self-assembly systems usually show relatively low utilization yield of photons and low fatigue resistance. Given that almost no example illustrates the different self-assembly behaviors of antiparallel and parallel conformers in the traditional photochromic diarylethene (DAE) system, here we have for the first time constructed a unique series of photoactive conformer-dependent metallacycles, focusing on the characterization and comparison of self-assembly behavior in different ligand conformers with different di-platinum(II) acceptors. Their photoswitchable scaffold sizes and shapes are precisely controlled by photochromically separable parallel or anti-parallel conformers via coordination-driven self-assembly. The ap-conformer and closed form provide larger bending angles upon coordination with di-Pt(II) acceptors into hexagon [6 + 6] or [3 + 3] while the p-conformer only can form smaller polygon cycles. Notably, in contrast with the non-photoactive parallel conformer, the reversible interconversion of anti-parallel ring-open and ring-closed conformer metallacycles can be achieved by alternate irradiation with UV and visible light, respectively, along with a relatively high conversion ratio and good fatigue resistance. This work provides a potential way to construct smart materials for use in sensing, catalysis and drug delivery systems.