Thiocyanato-copper(II) complexes derived from a tridentate amine ligand and from alanine

Two thiocyanato-Cu(II) complexes including mononuclear dithiocyanato Cu(Me 3 dpt)(NCS) 2 ( 1 ) and the polymeric 1D [Cu( d , l -Ala)(μ N,S –NCS)(H 2 O)] n ( 2 ) were synthesized and structurally characterized (Me 3 dpt = bis( N -methyl-3-propyl)methylamine, Ala = alaninate anion). The IR spectrum of complex 1 confirmed the N-bonding coordination mode of the thiocyanate groups, and its visible spectrum revealed the square pyramidal geometry around the central Cu 2+ ion. Single X-ray crystallography of 1 showed that the Cu(II) center displays square pyramidal geometry with severe distortion toward trigonal bipyramidal environment . Complex 2 forms a 1-D polymeric chain with the NCS − acting as a μ N,S -ligand . A distorted SP geometry around the Cu 2+ centers was achieved by the O and N atoms of alaninato anion, the aqua ligand and by the N and S atoms of the bridging thiocyanate groups. Hydrogen bonds of the type N–H···O, N–H···S and O–H···O are formed in this complex leading to the extension of the 1D chain to a supramolecular network.