2种同构紫精配位聚合物的合成及其光致变色性能

Synthesis and Photochromic Properties of Two Isostructural Viologen Coordination Polymers

变色材料作为一种新型的智能材料,在光存储信息和光学器件等领域具有巨大的应用潜力。以具有柔性骨架的紫精配体1,1’-双(4-羧基苄基)-4,4’-联吡啶二氯化物(H_(2)BpybcCl_(2))作为功能配体,与过渡金属离子Mn^(2+)和Cd^(2+)自组装,合成2个同构配位聚合物[Mn(Bpybc)Cl_(2)·H_(2)O]n(1)和[Cd(Bpybc)Cl_(2)·4H_(2)O]_(n)(2)。X射线单晶衍射表明,2个化合物为一维链状结构。在紫外灯照射下,光诱导电子转移而产生紫精自由基,2种化合物均表现出明显的光致变色行为。

As a new type of smart material,chromic materials have great applications in the fields of optical storage information and optical devices.Self-assembly of transition metal ions Mn^(2+)and Cd^(2+)with a viologen ligand,1,1′-bis(4-carboxybenzyl)-4,4′-bipyridinium dichloride(H_(2)BpybcCl_(2))with flexible backbone,forms two novel isostructural coordination polymers,[Mn(Bpybc)Cl_(2)·H_(2)O]n(1)and[Cd(Bpybc)Cl_(2)·4H_(2)O]_(n)(2).X-ray single-crystal diffraction shows that two compounds are one-dimensional chain structures.Both compounds exhibit obvious photochromic behaviors under UV irradiation,which is caused by photo-induced electron transfer to generate viologen free radicals.