Photochromic materials with different color changes are highly desirable for color indicators, anticounterfeiting marks, decoration, and other applications. Group modification and coordination with metals are common methods to obtain such materials. This work demonstrates that different coordination modes can acquire different color changes. Two known compounds, [Zn(suc)(bipy)]_n (1) and [Zn₂(mal)₂(μ-bipy)(H₂O)₂·2(H₂O)_0.25]_n (2) (suc = succinate, mal = malonate, bipy = 4,4′-bipyridine), exhibit different photochromic behaviors: compound 2 with dicoordinated bipy groups shows significant red-shift absorption compared to 1 with monocoordinated bipy groups after illumination. This discovery provides a new idea to develop photochromic materials with tailored color changes.

中文翻译：

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通过控制配位模式实现光致变色化合物的不同颜色变化

具有不同颜色变化的光致变色材料非常适合用于颜色指示剂，防伪标记，装饰和其他应用。基团修饰和与金属的配位是获得此类材料的常用方法。这项工作表明，不同的协调模式可以获取不同的颜色变化。两种已知化合物[Zn（suc）（bipy）] _n（1）和[Zn ₂（mal）₂（μ-bipy）（H ₂ O）₂ ·2（H ₂ O）_0.25 ] _n（2）（ suc =琥珀酸酯，mal =丙二酸酯，bipy = 4,4'-联吡啶），表现出不同的光致变色行为：化合物2具有双配位双联基团的对象在照明后比具有单配位双联基团的1显示出显着的红移吸收。这一发现为开发具有定制颜色变化的光致变色材料提供了新思路。