Light-Gated Modulation of Electronic Mobility of a Dihydropyrene-Based Photochromic Coordination Polymer

Photo-induced modulation of electronic
conductance has been achieved by employing an AgI-based
two-dimensional coordination polymer (CP) having pyridine-functionalized
photochromic dimethyldihydropyrene–cyclophanediene (DHP-CPD)
π-switch. Both the coordination polymer and the organic photochromic
core were characterized by single-crystal X-ray diffraction studies.
The coordination polymer displayed an excellent conductance in the
ON state of the switch in the closed form of DHP. Upon exposure to
visible light, the π-switch in the CPD form loses its planarity,
turning the switch OFF, which is reflected in the drastic reduction
of the conductance. Exposure to UV light turns the switch back ON
wherein the high electronic conductance of the polymer can be restored.

本研究采用基于碘化银（AgI）且修饰有吡啶功能化光致变色二甲基二氢芘-环蕃二烯（DHP-CPD）π开关的二维配位聚合物（CP），实现了电子电导的光诱导调控。对该配位聚合物及其有机光致变色核心，均通过单晶X射线衍射进行了表征。该配位聚合物在DHP闭环形式对应的开关开态下，展现出优异的电子电导性能。当暴露于可见光照射时，处于环蕃二烯（CPD）形式的π开关会丧失平面性，使开关切换至关态，电导随之出现急剧下降。将材料暴露于紫外光照射时，开关可重新切换至开态，聚合物的高电子电导得以恢复。