A new viologen ligand 1-(1-cyclohexylmethane)-4,4′-bipyridinium bromide (CMbpyBr) in the presence of benzenecarboxylates and metal ions affords three coordination polymers [Zn(CMbpy)(HBTC)Br]_n (1), [Cd(CMbpy)(m-BTC)(H₂O)]_n (2) and {[Cd(CMbpy)(m-BDC)(H₂O)₂][Cd(m-BDC)(m-HBDC)(H₂O)]}_n (3) (H₃BTC = 1,3,5-benzenetricarboxylic acid, m-H₃BTC = 1,2,4-benzenetricarboxylic acid, m-H₂BDC = 1,3-benzenedicarboxylic acid). Compounds 1 and 3 both have 1D structures, while compound 2 is 3D structure. More importantly, three compounds exhibit excellent photochromic behaviors in response to UV and X-ray dual light due to the formation of viologen radicals. However, the decolorization of the photochromic products for the three compounds is very different. The reason for their different photochromic behaviors has been explored.

在苯甲酸根和金属离子存在下，一种新的紫罗兰配体1-（1-环己基甲烷）-4,4'-联吡啶溴化物（CMbpyBr）提供了三种配位聚合物[Zn（CMbpy）（HBTC）Br] _n（1），[ Cd（CMbpy）（m -BTC）（H ₂ O）] _n（2）和{[Cd（CMbpy）（m -BDC）（H ₂ O）₂ ] [Cd（m -BDC）（m -HBDC） （H ₂ O）]} _n（3）（H ₃ BTC = 1,3,5-苯三羧酸，m -H ₃ BTC = 1,2,4-苯三羧酸，m -H₂ BDC = 1,3-苯二甲酸）。化合物1和3都具有1D结构，而化合物2是3D结构。更重要的是，由于紫罗兰素自由基的形成，三种化合物在响应于紫外线和X射线双重光时表现出出色的光致变色行为。但是，这三种化合物的光致变色产物的脱色差异很大。已经探究了它们不同的光致变色行为的原因。