Department of Chemistry & Chemical Engineering, Lvliang University, Lishi 033001, P. R. China.
Dalton Trans. 2018 Sep 11;47(35):12172-12180. doi: 10.1039/c8dt02574f.
The rational choice of an electron acceptor was proved to be an effective strategy for the development of novel electron transfer (ET) photochromic iodides, but the types and amounts of reported electron acceptors are relatively limited so far, especially for monocyclic aromatic molecules. Herein, using monocyclic pyridinium derivatives (N-protonation-4-carboxypyridinium/N-protonation-4-carbamoylpyridinium/1-methyl-4-(carbomethoxy)pyridinium) as structural directing agents and electron acceptors, five new electron donor-acceptor-based halo-argentate/cuprate hybrids or iodide salts have been synthesized, including [HINA][Ag4I5] (1), [HINAM]I (2), [HINAM]I·0.5(I2) (3), [MCMP][Ag2Br3] (4) and [MCMP][Cu2I3] (5). Noteworthily, compounds 1-3 exhibit interesting photochromic behaviours, while compounds 4 and 5 are non-photochromic. Finally, the possible chromic mechanisms and influencing factors for the title compounds were also discussed.
电子受体的合理选择被证明是开发新型电子转移（ET）光致变色碘化物的有效策略，但迄今为止，报道的电子受体的类型和数量相对有限，特别是对于单环芳香族分子。在此，我们使用单环吡啶鎓衍生物（N-质子化-4-羧基吡啶鎓/N-质子化-4-氨基甲酰基吡啶鎓/1-甲基-4-（甲氧羰基）吡啶鎓）作为结构导向剂和电子受体，合成了五个新型基于电子给体-受体的卤化银/铜混合或碘化物盐，包括[HINA][Ag4I5]（1）、[HINAM]I（2）、[HINAM]I·0.5(I2)（3）、[MCMP][Ag2Br3]（4）和[MCMP][Cu2I3]（5）。值得注意的是，化合物 1-3 表现出有趣的光致变色行为，而化合物 4 和 5 是非光致变色的。最后，还讨论了标题化合物的可能变色机制和影响因素。
