Synthesis, crystal structures and multinuclear NMR spectroscopy of copper(I) complexes with benzophenone thiosemicarbazone

Article abstract of DOI:10.1016/j.poly.2006.04.006

Reactions of benzophenone thiosemicarbazone (Hbztsc, Ph₂C{double bond, long}N-NH-C({double bond, long}S)-NH₂) with copper(I) chloride/bromide in the presence of two moles of PPh₃, formed monomeric tetrahedral complexes, [CuX (η¹-S-Hbztsc)(PPh₃)₂] · CH₃CN (X = Cl, 1; Br, 2). It did not form similar complex with copper(I) iodide; rather it formed a trigonal planar complex [CuI(η¹-S-Hbztsc)₂] (3) with two moles of Hbztsc in absence of PPh₃. All the complexes have been characterized with the help of elemental analyses, IR, ¹H, ¹³C, and ³¹P NMR spectroscopy, and single crystal X-ray crystallography. The crystal structure of ligand is also described. In all the complexes, benzophenone thiosemicarbazone is acting as a neutral S donor ligand in η¹-S bonding mode. NMR data support that the complexes remain stable in solution phase.