Synthesis, Structures and Fluorescence Properties of Two Novel Cadmium MOFs Based on a Tetraphenylethene(TPE)‐Core Ligand

Abstract Two novel Cadmium(II)‐based luminescent metal‐organic frameworks (LMOFs), namely, {[Cd(tipe) 0.5 (OBA)]⋅(H 2 O) 5 } [tipe=1,1,2,2‐tetrakis(4‐(1H‐imidazol‐1‐yl)phenyl)ethene, OBA=4,4‐oxoybis(benzoic acid)] ( MOF‐1 ) and [Cd 2 (tipe)(SDC) 2 ] (SDC=4,4′‐stilbenedicarboxylic acid) ( MOF‐2 ), have been prepared by a tetraphenylethene (TPE)‐core ligand under hydrothermal condition. Results of single crystal X‐ray diffraction show that MOF‐1 crystallizes in monoclinic system and MOF‐2 crystallizes in the triclinic system. And two complexes all have blue emission with maximal peaks at 488 nm ( MOF‐1 ) and 477 nm ( MOF‐2 ), respectively. Solvent exchange experiments show that they are stable in most of organic solvents. As to MOF‐1 , there exist different degrees of quenching or different stokes shifts in these solvents. It proves that MOF‐1 can have potential application in sensing organic solvents. Due to MOF‐2 ’s structural intercalation, the presence of organic solvents causes a large degree of quenching of fluorescence because they take part in photo‐induced electron transfer (PET) process.