Two new coordination polymers based on a pyridine-pyrazole bifunctional linker: Synthesis, structure and luminescent properties.

Abstract The solvothermal reaction of CdCl 2 or CuCl 2 with a pyridine-pyrazole bifunctional ligand 3,5‑diethyl‑4‑(4‑pyridyl)‑pyrazole (Hdeppz) under different solvents afforded two coordination polymers [Cd(Hdeppz) 2 (Cl) 2 ] n (1) and [Cu 4 ICuII(deppz) 4 (Cl) 2 ] n (2), respectively. Owing to different coordinated modes of Hdeppz and metal ions, 1 and 2 display different grid layer structures. In 1 , the neutral Hdeppz ligand behaves as a linear linker to connect two Cd2+ ions, while 2 contains not only the Y-shaped deppz linker but also the mixed valence of Cu+ and Cu2+ ions. Meanwhile, an uncommon Cu 4 (pz) 4 metallocyclic unit is formed in 2 , and which further produces an unprecedented (CuIICl 2 CuI 4) n supramolecular chain by Cu···Cl interactions. The strong solid-state blue-green luminescence was also observed in 1. Graphical abstract Two new coordination polymers were constructed by a pyridine-pyrazole bifunctional ligand, revealing novel 3D supramolecular frameworks and strong luminescent properties. Unlabelled Image Highlights • Two coordination polymers based on a pyridine-pyrazole bifunctional ligand • Rare Cu 4 (pz) 4 ring and Cu⋯Cl supramolecular chain were found. • Strong luminescence property was observed in Cd(II) complex. [ABSTRACT FROM AUTHOR]