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首页> 外文期刊>Crystal growth & design >Two New Coordination Compounds with a Photoactive Pyridinium-Based Inner Salt: Influence of Coordination on Photochromism
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Two New Coordination Compounds with a Photoactive Pyridinium-Based Inner Salt: Influence of Coordination on Photochromism

机译：具有光活性吡啶基内盐的两种新配位化合物：配位对光致变色的影响

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摘要

The past years have evidenced the rapid development of photochromic coordination compounds; however, the impact of coordination on the photochromic behavior of organic dyes has never been explored in the pyridinium derivative photochromic system. In this work, two new coordination compounds with a photoactive pyridinium-based inner salt, [Zn(H2O)(6)](PTA)center dot(CEbpy)(2)center dot 2H(2)O (1, PTA = terephthalate, CEbpy = 1-carboxyethyl-4,4'-bipyridine) and [Zn(H2O)(2)(CEbpy)(2)](n)Br-2n center dot[Zn(H2O)(4)(PTA)(n)] (2), were selected as model compounds for this purpose. Compound 1 features an isolated structure, where uncoordinated photoactive CEbpy ligands connect to hexahydrated zinc ions through hydrogen bonds. Compound 2 features a 1-D chain structure with CEbpy ligands coordinating to zinc ions. Compound 1 shows faster coloration speed upon irradiation than 2, demonstrating that coordination of the electron donor in CEbpy is not in favor of photochromic behavior. Both compounds show significant photoluminescence quenching after coloration, and the intensity contrast before and after coloration for 1 is larger than that for 2. This finding will help to design and synthesize new photochromic compounds with high performance.
机译：过去几年证明了光致变色配位化合物的快速发展。然而，在吡啶鎓衍生物光致变色体系中，从未研究配位对有机染料的光致变色行为的影响。在这项工作中，两个新的配位化合物与光敏吡啶鎓基内盐[Zn（H2O）（6）]（PTA）中心点（CEbpy）（2）中心点2H（2）O（1，PTA =对苯二甲酸，CEbpy = 1-羧乙基-4,4'-联吡啶）和[Zn（H2O）（2）（CEbpy）（2）]（n）Br-2n中心点[Zn（H2O）（4）（PTA）（为此，选择了n）]（2）作为模型化合物。化合物1具有孤立的结构，其中未配位的光敏CEbpy配体通过氢键与六水合的锌离子连接。化合物2具有1-D链结构，其中CEbpy配体与锌离子配位。化合物1照射后的着色速度快于化合物2，这表明CEbpy中电子给体的配位不利于光致变色行为。两种化合物在着色后均显示出显着的光致发光猝灭，并且着色前后的强度对比1大于2。该发现将有助于设计和合成具有高性能的新型光致变色化合物。

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