Assembly of a 2D Cd(II) Coordination Polymer from a New Multidentate Ligand 2-((1H-Tetrazol-5-yl)methyl)-1H-imidazole-4,5-dicarboxylic acid

Abstract

A new substituted imidazole-dicarboxylate compound, namely 2-((1H-tetrazol-5-yl)methyl)-1H-imidazole-4,5-dicarboxylic acid (H₄tamIDC), has been successfully designed and prepared. Then, H₄tamIDC is used as a multidentate ligand to react with Cd(II) ion under solvothermal conditions, giving rise to the construction of a two-dimensional (2D) Cd(II) coordination polymer formulated as {[Cd(H₂tamIDC)(H₂O)]·CH₃CN}_n (1). Single-crystal X-ray diffraction study indicates that the H₂tamIDC²⁻ ligand in complex 1 adopts an interesting coordination fashion named µ₃-kO:kO′:kN:kN′:kN″ to connect the Cd(II) ions into a 2D coordination framework containing dinuclear cadmium clusters. Such a 2D network can be simplified as a (4,4) topological net if each Cd₂ cluster is viewed as a four-connected node. Furthermore, the investigation of luminescence property reveals that complex 1 displays an intense emission around 475 nm when excited at 371 nm.

Graphical Abstract

A new 2D Cd(II) coordination polymer containing dinuclear cadmium clusters has been constructed by using a newly designed multidentate ligand 2-((1H-tetrazol-5-yl)methyl)-1H-imidazole-4,5-dicarboxylic acid and displays intense blue photoluminescence with a maximum emission band at 475 nm upon excitation at 371 nm.