Synthesis and Characterization of Thorium(IV) Complexes of 2,3-dimethyl-1-phenyl-4- (2-hydroxy-5-methyl phenyl azo)-pyrazol-5-one

Abstract

Five new Th(IV) complexes of an azo dye, 2,3-dimethyl-1-phenyl-4-(2-hydroxy-5-methylphenylazo)- pyrazol-5-one (cresol azo antipyrine, CAAPH) have been prepared and characterized by elemental analysis, magnetic moment and conductance measurements, IR and NMR spectral studies. The thermal behaviour of one of the complexes has also been examined. On the basis of the above studies, the complexes confirm the composition [Th(CAAPH)₂X₄], where X = NO₃^–, NCS^–, Cl^–, I^– or ClO₄^–. The X-ray powder diffraction patterns of the complex [Th(CAAPH)₂Cl₄] has been examined and found to be orthorhombic with the unit cell dimensions a = 15.4185 Å, b = 9.7577 Å and c = 7.2784 Å.