基于半刚性乳酸衍生物的单一手性配位聚合物的合成、结构与性质

摘要

在溶剂热反应条件下，用预先合成的乳酸衍生物（R）-H2CBA和（S）-H2CBA分别与含氮辅助配体（E）-1，2-二（4-吡啶基）乙烯（DPEE）和1，4-二（1H-咪唑-1-基）苯（1，4-DIB）组合，制备出2对不同结构的单一手性配位聚合物[Cd2（（R）-CBA）2（DPEE）（H2O）2]n （1-D），[Cd2（（S）- CBA）2（DPEE）（H2O）2]n（1-L），[Cd（（R）-CBA）（1，4-DIB）]·H2O（2-D）和[Cd（（S）-CBA）（1，4-DIB）]·H2O（2-L）。其中1-D和1-L是由梯形Cd-CBA链和DPEE配体连接成的二维框架结构；而2-D和2-L是三维超分子框架结构，包含3种不同类型的对映手性螺旋链。对上述化合物进行了粉末X射线衍射、热重分析和圆二色谱分析，并对其荧光性质进行了讨论。%Under the solvothermal reaction condition, two pairs of homochiral coordination polymers, namely [Cd2((R)-CBA)2(DPEE)(H2O)2]n(1-D), [Cd2((S)-CBA)2(DPEE)(H2O)2]n(1-L), [Cd((R)-CBA)(1,4-DIB)]·H2O(2-D) and [Cd((S)-CBA)(1,4-DIB)]. H2O(2-L)[DPEE=(E)-1,2-di(pyri-din-4-yl) ethene; 1,4-DIB=1,4-di(1H-imidazol-1-yl) benzene; (R)-H2CBA=(R)-4-(1-carboxyethoxy) benzoic acid;(S)-H2CBA=(S)-4-(1-carboxyethoxy)benzoic acid], have been prepared from synthetic lac-tic acid derivative ligands[ ( R)-H2 CBA and( S)-H2 CBA] , auxiliary ligands and Cd2+ions. Among these com-plexes, 1-D and 1-L have ladder-like Cd-CBA2- chains, which are further linked by DPEE ligands to form a 2D framework. Complexes 2-D and 2-L feature three-dimensional supramolecular structure with hydrogen bonds, containing three kinds of homochiral helical chains. Moreover, the thermal stabilities, solid-state circu-lar dichroism( CD) and photoluminescent properties of the complexes were also investigated.