Studies on Thorium(IV) and Dicxouranium(VI) Complexes of Schiff Bases Derived from 4-Aminoantipyrine

Abstract A series of 18 new complexes of thorium(IV) and dioxouranium(VI) of Schiff bases, viz. 4-[N(cinnamal-dehyde) amino]antipyrine (CAAP) and 4-[N(salicylaldehyde) amino] antipyrine (SAAP) have been synthesised in neutral medium and the complexes are characterized by elemental analysis, conductivity, and molecular weight data and they are assigned the general composition, ThX4.nL (X = Cl−, Br−, NCS− or NO− 3, n = 2; X = I− or ClO− 4, n = 3; L = CAAP or SAAP) and UC2X2.nL (X = Br−, I−, NCS−, NO− 3 or CH3COO−, n = 2; X = ClO− 4, n = 3; L = CAAP). The infrared studies indicate that the ligands are coordinating to the metal ion through carbonyl oxygen atom and azomethine nitrogen atom. The coordination number of Th(IV) is 6, 8, 10 or 12 and for U(VI) is 6 or 10 depending upon the nature of anion. The thermo-gravimetric analysis and X-ray diffraction studies of some of the complexes have also been reported.