A study of ruthenium complexes of some selected N—S donors Part II. Ligational behaviour of 2-formylpyridine(4-phenyl) thiosemicarbazone towards ruthenium

Abstract

Ru(II) and Ru(III) complexes of the biologically active tridentate NNS donors 2-formylpyridine(4- phenyl) thiosemicarbazone (L 1H) and 2-formylpyridine thiosemicarbazone (LH) have been synthesized and characterized by elemental analysis, conductance and magnetic susceptibility measurements, as well as by spectroscopic techniques such as UV—Vis, IR and NMR. A series of mononuclear bis chelates of the formulae [Ru(L 1H) 2](SCN) 2, [Ru(L 1H)(L 1)] Cl, [Ru(L 1) 2], [Ru(L)(LH)]ClO 4·2H 2O and mononuclear mixed ligand complexes such as [Ru(L 1H)Cl 2(CH 3OH)], [Ru(L 1H)(imz)Cl 2], [Ru(L 1H)(2-pico)(imz)]ClO 4, [Ru(L 1H)(TTSC)]Cl· 1 2 (C 2H 5) 2O, [Ru(L 1H)(imz)(thiosal)]Cl·CH 3OH, [Ru(L 1H)(bipy)Cl]Cl 2·CH 2Cl 2 have been isolated and characterized. Binuclear complexes [Ru 2(L 1) 2(OH) 2], [Ru 2(L 1) 2Cl 4]·4H 2O, [Ru 2(L 1) 2(SCN) 4]·H 2O, [Ru 2(L 1)(imz)Cl 4]·3CH 3OH, [Ru 2(L 1)(H 2O)Cl 4] have also been synthesized and characterized. From the analysis of spectroscopic and magnetic data the donor sites of the ligands have been located and the geometries of the donor environment around the Ru(II)/Ru(III) acceptor centre have been proposed.