Non-photochromic and photochromic complexes [Ni_1.5(CBbpy)(H₂O)₇]·(BTC)·5·.5H₂O (1), {[Co(CBbpy)₂(H₂O)₂]·(HBTC)·8H₂O}_n (2), {[MnNa(CBbpy)(BTC)(H₂O)₃]·H₂O}_n (3), {[Zn₃(CBbpy)₂(BTC)₂(H₂O)]·H₂O}_n (4), {[Cd(CBbpy)(HBTC)(H₂O)]·H₂O}_n (5) based on the bipyridinium-based ligand 1-(2-carboxyethyl)-4,4′-bipyridinium bromide (HCBbpyBr) and 1,3,5-benzenetricarboxylic acid (H₃BTC) have been successfully obtained by tuning different metal ions. Although five complexes contain the same bipyridinium ligand, only 3–5 possess reversible photochromic behavior. Unfortunately, 1 and 2 exhibit non-photochromic action when exposed to UV light for approximately 2 h. EPR spectra verify that photochromic course of 3–5 is derived from the formation of CBbpy radicals by photo-induced electron transfer after irradiation. The effect of diverse metal ions on the structure and photochromic action of the five complexes has been discussed.

非光致变色和光致变色配合物[Ni _1.5 (CBbpy)(H ₂ O) ₇ ]·(BTC)·5·.5H ₂ O ( 1 ), {[Co(CBbpy) ₂ (H ₂ O) ₂ ]·( HBTC)·8H ₂ O} _n ( 2 ), {[MnNa(CBbpy)(BTC)(H ₂ O) ₃ ]·H ₂ O} _n ( 3 ), {[Zn ₃ (CBbpy) ₂ (BTC) ₂ (H ₂ O)]·H ₂ O} _n ( 4 ), {[Cd(CBbpy)(HBTC)(H ₂ O)]·H₂ O} _n ( 5 ) 基于联吡啶配体1-(2-羧乙基)-4,4'-联吡啶溴化物(HCBbpyBr)和1,3,5-苯三甲酸(H ₃ BTC)已成功获得通过调整不同的金属离子。虽然五个配合物包含相同的联吡啶配体，但只有3-5个具有可逆的光致变色行为。不幸的是，当暴露在紫外线下约 2 小时时，1和2表现出非光致变色作用。EPR 光谱验证3 – 5的光致变色过程来源于辐照后光诱导电子转移形成的 CBbpy 自由基。讨论了不同金属离子对五种配合物的结构和光致变色作用的影响。