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首页> 外文期刊>Dyes and Pigments >Proton coupled electron transfer mechanism for the design and construction of crystalline hybrid photochromic halometallates based on nonphotoactive polypyridine-derivative moieties
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Proton coupled electron transfer mechanism for the design and construction of crystalline hybrid photochromic halometallates based on nonphotoactive polypyridine-derivative moieties

机译：基于非摄氏性息肉 - 衍生物的晶体杂交光致变色卤素的设计与构建质子耦合电子转移机构

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摘要

Photochromic materials have application in various areas such as anti-counterfeiting, display, switches, etc. Most of reported photochromic materials are supported by photoactive moieties such as diarylethenes, pyridinium, azo compounds. Compared with the broadly investigated photochromic materials driven by photoactive units, the generation of new photochmmic materials based on nonphotoactive units is of paramount significance from the perspective of basic research and practical application. Based on the proton coupled electron transfer (PCET) mechanism, the introduction of conjugated triangular tripyridine-derivative unit TPT (2,4,6-tri(4-pyridyl)-1,3,5-triazine) and linear dipyridine-derivative unit BPYB (1,4-di(pyridine-4-yl)benzene) into the zincochloride system generates two hybrid halometallates with photochmmic performance, [H2BPYB][ZnCl4]center dot H2O (1) and [H3TPT](2)[Zn3Cl12]center dot 4H(2)O (2). Both 1 and 2 feature isolated inorganic [ZnCl4](2-) tetrahedra (as electron donors and H-bond acceptors) and protonated organic polypyridine derivatives units [H2BPYB](2+) and [H3TPT](3+) (as electron acceptors and H-bond donors). Experimental characterization, together with the structure-property relationship analysis, indicates that the resulting photocoloration and related photoresponsive properties of 1 and 2 is ascribable to the PCET mechanism.
机译：光致变色材料在防伪、显示、开关等领域有着广泛的应用。大多数报道的光致变色材料都由二芳基乙烯、吡啶、偶氮化合物等光活性部分支撑。与广泛研究的由光活性单元驱动的光致变色材料相比，基于非光活性单元的新型光致变色材料的产生从基础研究和实际应用的角度来看具有重要意义。基于质子耦合电子转移（PCET）机理，在氯化锌体系中引入共轭三角形三吡啶衍生物单元TPT（2,4,6-三（4-吡啶基）-1,3,5-三嗪）和线性二吡啶衍生物单元BPYB（1,4-二（吡啶基-4-基）苯），生成两种具有光化学性能的杂化卤代金属盐，[H2BPYB][ZnCl4]中心点H2O（1）和[H3TPT]（2）[Zn3Cl12]中心点4H（2）O（2）。1和2都具有孤立的无机[ZnCl4]（2-）四面体（作为电子供体和氢键供体）和质子化的有机多吡啶衍生物单元[H2BPYB]（2+）和[H3TPT]（3+）（作为电子受体和氢键供体）。实验表征以及结构-性能关系分析表明，1和2产生的光致变色和相关的光响应性能可归因于PCET机制。

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