Synthesis and spectroscopic studies of copper(II) complexes derived fromN-2-pyridyl-N-phenylthiourea

Abstract

N-2-pyridyl-N′-phenylthiourea (HPyPt) complexes of copper(II) have been synthesized and characterized by analytical and spectroscopic (i.r., u.v.-vis., n.m.r. and e.s.r.) studies. Two types of complexes have been isolated; one involving the neutral HPyPt ligand (e.g., [Cu(HPyPT)Br2]) and the other the deprotonated PyPT (e.g., [Cu(PyPT)H2O](ClO4)). The first type has the ligand behaving in a bidentate manner coordinatingvia the (NH′) and the pyridyl nitrogens in case of the halide complexes. The second type has the ligand serving as a NN-bidentate with the sulfur atom bridging to an adjacent copper(II) to form a polymeric structure. This behavior is suggested for the polyatomic anion complexes in which a water molecule completes the coordination number to four about the copper ion. Spectral studies suggest distorted octahedral geometry for the copper(II) chlorides, square pyramidal structure for the copper(II) bromide dimer and a distorted tetrahedral structure is envisioned for the polyatomic anion complexes.