Two novel photochromic complexes [Zn₂(bpdc)₂(m-DPNDI)₂]·H₂O (1) and [Cd(bpdc)(m-DPNDI)]·H₂O (2) (H₂bpdc = 4,4′-diphenic acid, m-DPNDI = N,N′-bis(3-pyridyl)-1,4,5,8-naphthalenetetracarboxydiimide) were prepared through a solvothermal method. In complexes 1 and 2, the selection of electron-deficient ligand m-DPNDI and electron-rich ligand bpdc²⁻ is aimed at forming a complete donor–acceptor pair and establishing a suitable electron transfer pathway to realize photoinduced electron transfer. Both complexes exhibited interesting photochromic and photoresponsive luminescence behaviours, which was verified by EPR, XRD and IR measurements. Furthermore, the existence of interpenetrating networks and abundant π⋯π interactions in 1 makes the framework intact at below 460 °C.

中文翻译：

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高热稳定性萘二酰亚胺配位聚合物的光致变色和光响应发光

两种新型光致变色配合物[Zn ₂（bpdc）₂（m -DPNDI）₂ ]·H ₂ O（1）和[Cd（bpdc）（m -DPNDI）]·H ₂ O（2）（H ₂ bpdc = 4通过溶剂热法制备了，4′-二苯甲酸，m -DPNDI ＝N，N′-双（3-吡啶基）-1,4,5,8-萘四甲酸二酰亚胺）。在配合物1和2中，缺电子配体m -DPNDI和富电子配体bpdc ^2-的选择目的是形成完整的供体-受体对，并建立合适的电子转移途径以实现光致电子转移。两种配合物均表现出有趣的光致变色和光响应发光行为，这已通过EPR，XRD和IR测量得到证实。此外，互穿网络的存在和大量π⋯π相互作用（在1中）使框架在460°C以下保持完整。