(Acetato-κO)(2-acetyl­pyridine 4-methyl­thio­semi­carbazonato-κ3N,N′,S)copper(II) monohydrate

In the title compound, [Cu(C9H10N4S)(C2H3O2)]·H2O, the Cu atom adopts a slightly distorted square-planar coordination geometry. The 2-acetyl­pyridine thio­semicarbazone group is very close to planar. The computed bond valencies for the Cu centre are ν(Cu—N) = 0.349 and 0.404 valence units (v.u.), ν(Cu—S) = 0.627 v.u., and ν(Cu—O) = 0.483 v.u. There is an out of plane Cu—O(acetate) bond [2.639 (13) A], which makes a contribution of 0.08 v.u. The computed valency of the Cu atom is thus 1.94 v.u. Hydrogen bonds between pairs of mol­ecules create dimers.