Bromidobis[3-(1H-pyrazol-1-yl-kN2)-propionamide-kO]copper(II) bromide methanol monosolvate

Abstract

The title copper(II) N-pyrazolylpropanamide (PPA) complex, [CuBr(PPA) 2]Br, was obtained in 78% yield by treatment of CuBr2 with an excess of the ligand in methanol. Crystallization from the mother liquid afforded the title compound, i.e. the methanol solvate [CuBr(C6H 9N3O)2]Br·CH3OH or [CuBr(P-PA)2]Br·MeOH, as bright green crystals. In the solid state, the title salt comprises isolated [CuBr(PPA)2]+ cations, separated bromide ions and methanol of crystallization. In the cation, the central CuII ion is coordinated by two N,O-chelating PPA ligands and one Br- ion. The coordination geometry around the CuII ion is distorted trigonal-bipyramidal with the bromide ligand and the amide O atoms occupying the equatorial positions [Cu-Br = 2.4443 (4) Å; Cu-O = 2.035 (2) and 2.179 (2) Å], while the pyrazole N atoms coordinate in the axial positions [Cu-N = 1.975 (2) and 1.976 (2) Å]. In the crystal, the three constituents are linked by N-H···Br, O-H···Br, and N-H···O hydrogen bonds, forming a three-dimensional network.