Synthesis and characterization of three 2D Cd (II) coordination polymers built with terphenyl-2, 2′, 4, 4′-tetracarboxylate and flexible bis(imidazole)

Abstract Three new Cd II coordination polymers, namely, {[Cd 2 (L) (1, 2-bix) 2 (H 2 O) 2 ]⋅2H 2 O} n (1), [Cd 2 (L) (1, 3-bix) 2 ] n (2), and {[Cd (H 2 L) (1, 4-bix) (H 2 O) 2 ]⋅2H 2 O} n (3) [H 4 L = terphenyl-2, 2′, 4, 4′-tetracarboxylic acid, 1, n -bix = 1, n -bis(imidazol-l-ylmethyl) benzene ( n  = 2, 3, 4)], have been synthesized under hydrothermal conditions and characterized by single-crystal X-ray diffraction, IR, thermogravimetric analysis, and fluorescent analysis. Complex 1 is a 2D wavelike network structure incorporating the dinuclear Cd 2 (1, 2-bix) 2 units, whereas complex 2 possesses a 2D stair-like network structure consisting of the dinuclear Cd 2 O 2 units. Complex 3 features a 2D puckered network constructed by 1D [Cd (H 2 L)] n and 1D [Cd (1, 4-bix)] n chains. The results show that the structural diversity of the polymers is mainly attributed to the usage of diverse ancillary bis (imidazol-1-ylmethyl)-benzene isomers ligands. The thermal stabilities and photoluminescence behaviors were also investigated.