Synthesis, characterization and anticancer studies of bis(1-phenylpiperazine dithiocarbamato) Cu(II), Zn(II) and Pt(II) complexes: Crystal structures of 1-phenylpiperazine dithiocarbamato-S,S ' zinc(II) and Pt(II)

Copper(II), zinc(II) and platinum(II) complexes of phenylpiperazine dithiocarbamate formulated as [CuL2], [PtL2] and [Zn-2(mu-L)(2)(L)(2)], where L= phenylpiperazine dithiocarbamate were prepared and characterized by elemental analysis IR, UV-Visible, H-1 and C-13 NMR spectroscopy. Single crystal X-ray structures of the Zn(II) and Pt(II) complexes are also reported. The FTIR spectra of the complexes confirm the bidentate coordination of the ligand to the metal ions by the single band due to v((c-s)) observed in the range 1012-1014 cm(-1) compared to that of the ligand at 994 cm(-1). Electronic spectra of both the Cu(II) and Pt(II) complex are consistent with square planar geometry, this is further confirm in the case of the Pt(II) complex by the single X-ray crystal structure. The molecular structure of the Zn(II) complex indicate a centrosymmetric dimeric compound in which each of the zinc ion is bonded to two molecules of the ligands acting as either bidentate chelating or as bridging coordinating ligand resulting in a distorted octagonal cycle comprising of two zinc ions, two thioureide carbons and four sulphur atoms. The geometry around each zinc ion is a distorted tetrahedral geometry. The Pt(II) complex consist of a monomeric entity where the Pt(II) ion is surrounded by four sulphur donor atoms from the two phenylpiperazine dithiocarbamate ligands forming a slightly distorted square planner geometry around the Pt(II) ion. Anticancer potency of the complexes against three cancer cell lines indicates UACC62 > MCF7 > TK10 at IC50 values of 3.34, 17.52 and 19.83 mu M respectively for the Cu(II) complex. MCF7 >1100 > UACC62 at IC50 of 8.42, 13.40 and 15.14 mu M respectively for Zn(II), whereas for the Pt(II) the activity stands at concentration (IC50) >100 AM for all the cell lines. (C) 2018 Elsevier B.V. All rights reserved.