Preparation and characterization of Some Cobalt (II) Complexes Containing Mixed Ligands (Salicylaldehyde Thiosemicarbazone and Carboxylic Acids)

Abstract

Preparation and characterization of new cobalt (II) complexes with mixed ligands
including salicylaldehyde thiosemicarbazone-STH2 and carboxylic acid-AH2 {salicylic
acid-SH2 or anthranilic acid-AnH2 or phthalic acid-PH2} have been studied. The resulted
complexes were characterized using different physico-chemical methods from which the
general formulaes [Co2(AH2)2(STH2)2(NO3)2](NO3)2 or [Co2(AH2)2(STH2)2Xn] have been
suggested in neutral medium giving either cationic or neutral complexes . Whereas , in
basic medium the formula [Co2(AH)2(STH)2] has been proposed {where X = CO₃ ^2- or CH3CO₂ ^- ,

n = 2 or 4} .The study suggested that the complexes had octahedral geometries forming
dimer (binuclear complexes).