Complexes of AgI, TlI, ZnII, CdII, HgII , CoII, NiII , RuII , PdII , RuIII , RhIII and PtIV with 4-(pyridine-2-carboxylidineamino )-5-mercapto-1 ,2 ,4-triazole

Department of Chemistry, University of Calicut, Calicut University-673 635, Kerala, India

E-mail : drabrahamj@gmail.com

Department of Studies in Chemistry, Mangalore University, Mangalagangothri-574 199, Karnataka, India

E-mail : nbadiadka@gmail.com

Manuscript received 7 August 2007, revised 29 October 2007, accepted 12 February 2008

The synthesis and characterization of complexes of Ag^I, Tl^I, Zn^II, Cd^II , Hg^II , Co^II, Ni^II , Pd^II , Ru^II, Ru^III, Rh^III and Pt^IV with 4-(pyridine-2-carboxylidineamino)-5-mercapto-1,2,4-triazole (PMT) have been carried out on the basis of chemical and physical methods like elemental analysis, infrared, ¹H NMR and electronic spectral studies, magnetic susceptibility measurements, conductance and thermal studies. Octahedral structures have been proposed for the Co^II , Ni^II , Ru^II, Ru^III , Rh^III and Pt^IV complexes, square-planar for the Pd^II complex, tetrahedral for the Zn^II , Cd^II and Hg^II complexes and linear polymeric structures for the Ag^I and TI^I complexes. The ligand coordinates to the metal ions through thiol sulfur after deprotonation and with nitrogen of the azomethine group. Pyridine nitrogen of PMT is also involved in coordination in Pd^II , Ru^III , Rh^III and Pt^IV complexes.