SYNTHESIS, SPECTRAL AND THERMAL PROPERTIES OF SOME HIGH COORDINATED COMPLEXES OF THORIUM(IV) AND DIOXOURANIUM(VI) DERIVED FROM 4[N-(2'-HYDROXY-1'-NAPHTHALIDENE)AMINO] ANTIPYRINETHIOSEMICARBAZONE

Abstract

In present work, we describe the synthesis of thorium(IV) and dioxouranium(VI) coordination compounds of 4[N-(2\'-hydroxy-1\'-naphthalidene)amino]antipyrinethio- semicarbazone (HNAAPTS) with the general composition ThX₄.n(HNAAPTS) (X = Cl, Br, I, NCS or ClO₄, n = 2; X = NO₃, n = 1) and UO₂X₂.n(HNAAPTS) (X = Br, I, NCS or ClO₄, n = 2, X = NO₃ or CH₃COO, n = 1). All the coordination compounds were characterized by analytical, molar mass, molar conductance and infrared studies. The infrared spectral studies reveal that the ligand HNAAPTS is coordinated in neutral tridentate (N,N,S) fashion. The coordination number of Th(IV) in these coordination compounds varies from 6, 8, 10 or 11; while for U(VI) the coordination number are 8, 9 or 10. Thermal stabilities of these complexes were investigated through thermogravimetric analysis.


KEY WORDS: Thorium(IV) complexes, Dioxouranium(VI) complexes, 4[N-(2\'-hydroxy-1\'-naphthalidene)amino]antipyrinethiosemicarbazone


Bull. Chem. Soc. Ethiop. 2005, 19(2), 185-195