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Synthesis, spectroscopy and X-ray crystal structures of some zinc(II) and cadmium(II) complexes of the 2-pyridinecarboxaldehyde Schiff bases of S-methyl- and S-benzyldithiocarbazates

Published:28 May 2014 DOI: 10.1016/j.poly.2014.02.016
Aminul Huq Mirza , Malai Haniti S.A. Hamid , Sazwani Aripin , Mohammad Rezaul Karim , Md. Arifuzzaman , Mohammad Akbar Ali , Paul V. Bernhardt

Abstract

The Schiff bases formed by condensation of S-methyl- and S-benzyldithiocarbazate with 2-pyridinecarboxaldehyde react with zinc(II) and cadmium(II) acetates to form stable metal complexes of general formulas, [Zn(NNS)(CH3COO)]2 and [M(NNS)2] (M?=?Zn2+, Cd2+; NNS??=?anionic forms of the 2-pyridinecarboxaldenhdye Schiff bases of S-methyl- and S-benzyldithiocarbazate, respectively) which have been characterized by a variety of physico-chemical techniques and X-ray crystallographic structure analysis. The complexes, [Zn(NNS)(CH3COO)]2 are acetate anion-bridged centrosymmetric dimers in which each of the Schiff bases is coordinated to the zinc(II) ions as a uninegatively charged NNS tridentate chelating agent coordinating via the pyridine nitrogen atom, the azomethine nitrogen atom and the thiolate sulfur atom. The acetate anion acts as a bridging bidentate ligand coordinating with the two zinc atoms in a synsyn manner. Each zinc(II) ion in the dimer adopts an approximately square-pyramidal geometry. The bis-ligand complexes, [M(NNS)2] (M?=?Zn2+, Cd2+) have distorted octahedral structures in which the two anionic Schiff bases are coordinated to the metal ions meridionally as NNS tridentate chelating agents via the pyridine nitrogen atom, the azomethine nitrogen atom and the thiolate sulfur atom.

Both the mono- and bis-ligand zinc(II) complexes exhibit strong cytotoxic activity against the HELA (human cervical cancer) cell lines. Some of these compounds exhibit stronger cytotoxicity against HELA than the commercially important anticancer drug, Tamoxifen.

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Procduct Name CAS Molecular Formula Supplier Price
Zinc stearate 557-05-1 C36H70O4Zn 682 suppliers $6.00-$498.50
2-Pyridinecarboxaldehyde 1121-60-4 C6H5NO 653 suppliers $7.00-$750.00
Tamoxifen 10540-29-1 C26H29NO 419 suppliers $30.00-$2148.30
CADMIUM BROMIDE TETRAHYDRATE 13464-92-1 Br2CdH2O 117 suppliers $22.03-$2474.62
ACETATE 13867-82-8 C23H31Cl3O4 14 suppliers $130.00-$213.65
(3,3'-(2,2'-(ethylenedioxy)dibenzylidene)bis(S-methyl dithiocarbazate))nickel(II) - Inquiry

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