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

Reactions of benzophenone thiosemicarbazone (Hbztsc, Ph2CN-NH-C(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.

Graphical abstractBenzophenone thiosemicarbazone has yielded tetrahedral complexes with copper(I) chloride/bromide in presence of PPh3 (1 and 2), and a trigonal planar with copper(I) iodide (3).Figure optionsDownload full-size imageDownload as PowerPoint slide