Structural studies on acetophenone- and benzophenone-derived thiosemicarbazones and their zinc(II) complexes

In the present work N(3)-meta-chlorophenyl-(HAc3mCl, 1) and N(3)-meta-fluorphenyl-(HAc3mF, 2) acetophenone thiosemicarbazone, and N(3)-meta-chlorophenyl-(HBz3mCl, 3) and N(3)-meta-fluorphenyl-(HBz3mF, 4) benzophenone thiosemicarbazone were obtained, as well as their zinc(II) complexes [Zn(Ac3mCl)2] (5), [Zn(Ac3mF)2] (6), [Zn(Bz3mCl)2] (7) and [Zn(Bz3mF)2] (8). Upon re-crystallization in DMSO:acetone conversion of 8 into [Zn(Bz3mF)2]·(DMSO) (8a) occurred. The crystal structures of 2, 5 and 8a were determined.

► Acetophenone- and benzophenone-derived thiosemicarbazones were synthesized.
► Zinc(II) complexes of the thiosemicarbazones were obtained.
► Structural studies were carried out by means of electronic, IR and NMR spectra.
► The crystal structures of a ligand and two zinc(II) complexes were determined.
► The zinc(II) complexes present highly distorted tetrahedral geometry.