Syntheses, crystal structures and luminescent properties of four one-dimensional coordination polymers [Cu(μ-X)(brdmpzm)]n (X = Cl, Br, I, CN; brdmpzm = bis(4-bromo-3,5-dimethylpyrazol-1-yl)methane)

Solvothermal reactions of CuX (X = Cl, Br, I, CN) with bis(4-bromo-3,5-dimethylpyrazol-1-yl)methane (brdmpzm) in MeCN gave rise to four one-dimensional coordination polymers [Cu(μ-X)(brdmpzm)]n (X = Cl (1), Br (2), I (3), CN (4)). Compounds 1–4 were characterized by elemental analysis, IR spectra and X-ray crystallography. X-ray analysis revealed that 1–3 have a 1D split-stair chain derived from connecting [Cu(brdmpzm)] fragments via μ-X bridges, while 4 consists of a zigzag chain formed by linking [Cu(brdmpzm)] fragments via μ-CN bridges. The luminescence properties of 1–4 along with free brdmpzm ligand at ambient temperature were also investigated.