Synthesis and characterization of some mixed ligand complexes of thorium(IV) and dioxouranium(VI) with salicylylhydrazine and its derivatives

A series of 12 mixed ligand complexes of Th(IV) and UO2(VI) with salicylylhydrazine (SH) and its derivatives as primary ligands and two different anions, viz, nitrate and thiocyanate as secondary ligands have been synthesised and characterised on the basis of elemental analysis, molecular weight, molar conductance, IR spectral, TG and DTG data. These complexes have the general formulae [Th(LL)(2)(NO3)(4)], [Th(LL)(2)(NCS)(4)], [UO2(LL)(2)(NO3)(2)] and [UO2(LL)(2)(NCS)(2)] where LL = SH, ASH, BSH. In these complexes the primary ligands salicylylhydrazine (SH), acetyl salicylylhydrazine (ASH) and benzoyl salicylylhydrazine (BSH) act as neutral bidentate ligand and the secondary ligands, viz., the monovalent anions NO3- and NCS- act as unidentate ligands.