As a relatively new type of multifunctional material, chromic materials have attracted much attention due to their potential applications in many fields. In order to investigate the effect of metal cations on the chromic behavior, three new isostructural coordination polymers (CPs) based on the electron-deficient viologen-like ligand 1-(2-carboxyethyl)-4,4′-bipyridinium bromide (HCBbpyBr) and 1,2,4,5-benzenetetracarboxylic acid (H₄BTEC) with different metal cations have been synthesized, namely {[TM_0.5(CBbpy)(H₂O)][TM(H₂O)₆]_0.5(H₂BTEC)·H₂O}_n (TM = Zn (1), Ni (2) and Co (3)), exhibiting metal-dependent chromic behavior and adjustable responsive properties. Compound 1 only exhibits photochromism, compound 2 exhibits both photochromism and hydrochromism, while compound 3 has no chromism observed. Comparison of the three CPs shows that metal cations play an important role in regulating the chromic properties.

作为一种相对新型的多功能材料，铬材料由于其在许多领域的潜在应用而备受关注。为了研究金属阳离子对铬行为的影响，基于电子缺陷型紫精样配体1-（2-羧乙基）-4,4'-溴化吡啶鎓（HCBbpyBr）的三种新型同构配位聚合物（CP）合成了具有不同金属阳离子的1,2,4,5-苯四甲酸（H ₄ BTEC），即{[TM _0.5（CBbpy）（H ₂ O）] [TM（H ₂ O）₆ ] _0.5（H ₂ BTEC）·H ₂ O} _n（TM = Zn（1），Ni（2）和Co（3）），表现出金属依赖性的铬行为和可调节的响应特性。化合物1仅显示光致变色，化合物2同时显示光致变色和水致变色，而化合物3未观察到变色。三种CP的比较表明，金属阳离子在调节铬的性质方面起着重要的作用。