Synthesis, crystal structure and photophysical properties of chlorido-[( E )-3-hy-droxy-2-methyl-6-(quinolin-8-yldiazen-yl)phenolato]copper(II) monohydrate.

The reaction between copper(II) chloride dihydrate and the ( E )-2-methyl-4-(quinolin-8-yldiazen-yl)benzene-1,3-diol ligand in aceto-nitrile leads to the formation of the title compound, [Cu(C 16 H 12 N 3 O 2 )Cl]·H 2 O. The ligand is deprotonated and coordinates with three donor atoms (tridentate) to the Cu II ion. Individual mol-ecules of the Cu II complex are connected by chloride bridges, forming a one-dimensional coordination polymer. No photoisomerization to the cis isomer of the azo ligand was observed upon irradiation with UV light.