STUDIES ON THORIUM(IV) AND DIOXOURANIUM(VI) COMPLEXES OF SCHIFF-BASESDERIVED FROM 4-AMINOANTIPYRINE

A series of 18 new complexes of thorium(IV) and dioxouranium(VI) of Sc hiff bases, viz. 4-[N(cinnemaldehyde)amino]antipyrine (CAAP) and 4-[N( salicylaldehyde)amino]antipyrine (SAAP) have been synthesised in neutr al medium and the complexes are characterized by elemental analysis, c onductivity, and molecular weight data and they are assigned the gener al composition, ThX4.nL (X = Cl-, gr-, NCS- or NO3-, n = 2; X = I- or ClO4-, n = 3; L = CAAP or SAAP) and UO2X2.nL (X = Br-, I-, NCS-, NO3- or CH3COO-, n = 2; X = ClO4-, n = 3; L = CAAP). The infrared studies i ndicate that the ligands are coordinating to the metal ion through car bonyl oxygen atom and azomethine nitrogen atom. The coordination numbe r of Th(IV) is 6, 8, 10 or 12 and for U(VI) is 8 or 10 depending upon the nature of anion. The thermogravimetric analysis and X-ray diffract ion studies of some of the complexes have also been reported.