The design and fabrication of crystalline photoswitchable materials play highly crucial roles for potential multidisciplinary applications. Good optimizations of the self-consistent donor–acceptor pair and skillful utilizations of weak intercomponent interactions are of great importance for redox photochromic coordination polymers (CPs). Herein, a novel redox chromic CP system with the photosensitive 2,6-di(1,6-naphthyridin-2-yl)pyridine (L) ligand has been developed for the first time, which contains a metallomacrocycle-based layer, a bent Z-shaped chain and a robust framework. Due to the photo-irradiated electron transfer, these CPs exhibit reversible color changes from yellow to green, colorless to blue and pale yellow to orange within an extremely short time. More interestingly, the photochromic framework can selectively and sensitively recognize volatile trolamine vapor through visible vapochromism resulting from quenching of the free radicals by the electron-enriched amino group. As compared with two low-dimensional CPs, the metal-assistant short contacts and intramolecular π⋯π interaction between benzenedicarboxylate and L is cooperatively responsible for the high-efficiency sensing. These findings present a new dual photochromic and vapochromic CP platform enabling visualized detection for electron-rich vapors.

中文翻译：

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首个 2,6-二(1,6-萘啶-2-基) 吡啶基氧化还原光致变色配位聚合物平台对三乙醇胺具有选择性汽色作用

晶体光开关材料的设计和制造对于潜在的多学科应用起着至关重要的作用。自洽供体-受体对的良好优化和弱组分间相互作用的巧妙利用对于氧化还原光致变色配位聚合物（CP）非常重要。在此，首次开发了一种具有光敏 2,6-二(1,6-萘啶-2-基)吡啶 (L) 配体的新型氧化还原铬 CP 体系，该体系包含金属大环基层、弯曲的Z 形链条和坚固的框架。由于光照射电子转移，这些 CP 在极短的时间内表现出从黄色到绿色、无色到蓝色和淡黄色到橙色的可逆颜色变化。更有趣的是，光致变色框架可以通过富电子氨基淬灭自由基产生的可见蒸气变色选择性和灵敏地识别挥发性三乙醇胺蒸气。与两个低维CPs相比，苯二羧酸盐和L之间的金属辅助短接触和分子内π⋯π相互作用共同负责高效传感。这些发现提出了一种新的双光致变色和蒸汽变色 CP 平台，可以对富电子蒸汽进行可视化检测。苯二羧酸盐和 L 之间的金属辅助短接触和分子内 π⋯π 相互作用共同负责高效传感。这些发现提出了一种新的双光致变色和蒸汽变色 CP 平台，可以对富电子蒸汽进行可视化检测。苯二羧酸盐和 L 之间的金属辅助短接触和分子内 π⋯π 相互作用共同负责高效传感。这些发现提出了一种新的双光致变色和蒸汽变色 CP 平台，可以对富电子蒸汽进行可视化检测。