基于含蒽荧光配体的层柱型金属有机框架的合成及压致变色研究

Synthesis of Pillared-layer Metal-organic Frameworks from Anthracene Luminescent Linkers and Their Piezochromic Properties

利用含蒽荧光配体9,10-双[(E)-2-(吡啶-4-基)乙烯基]蒽(BP4VA)分别与2种不同长度的二羧酸配体反应,合成了层柱型的金属有机框架(MOFs)材料FDM-26和具有dia拓扑的三维材料FDM-27,并解析了其单晶结构.此外,对含有配位键断裂缺陷的基于BP4VA配体的层柱型MOFs材料FDM-22晶体施加外界压力,研究了压力刺激对FDM-22结构和荧光性质的影响.结果表明,在压力作用下,FDM-22能够保持结构稳定,但其荧光发射波长出现红移.经分析发现,此压致变色性能是由于结构内压力诱导生成的配位缺陷数目增加所致.

Employing anthracene luminescent linker 9,10-bis[(E)-2-(pyridin-4-yl)vinyl]anthracene(BP4VA)and two kind of carboxylic acid linkers with different lengths,two metal-organic framework(MOF)structures,FDM-26 with pillared-layer network and FDM-27 with dia topology,were synthesized.Moreover,the piezochromic property of BP4VA-based pillared-layer structure FDM-22 was investigated.Applying external pressure to the single crystals of FDM-22,which feature intrinsic coordination defects due to the metal-linker coordination bond breakage during activation,the framework integrity remains.However,their luminescence spectra show red shift up to 60 nm.It is concluded that the piezochromic response is due to the accumulation of more coordination defects after the pressure is applied.