Studies on Some Thorium(IV) Complexes with High Coordination Numbers Derived from Semicarbazones of 4‐Aminoantipyrine

Abstract The interaction of thorium(IV) salts with 4[N‐(benzylidene)amino]antipyrine semicarbazone (BAAPS), 4[N‐(4′‐methoxybenzylidene)amino]antipyrine semicarbazone (MBAAPS), 4[N‐(4′‐dimethoxyaminobenzylidene)amino]antipyrine semicarbazone (DABAAPS), 4[N‐(2′‐nitrobenzylidene)amino]antipyrine semicarbazone (2′‐NO2BAAPS), and 4[N‐(3′‐nitrobenzylidene)amino]antipyrine semicarbazone (3′‐NO2BAAPS) in non‐aqueous solvents resulted in the formation of [ThL2X4] (X = Cl, Br, or NCS), [ThL2I2]I2, [ThL2](ClO4)2 or [ThL(NO3)4] (L = BAAPS, MBAAPS, DABAAPS, 2‐NO2BAAPS, or 3‐NO2BAAPS). All of these compounds were characterized by elemental analyses, electrical conductivity, IR, and thermal methods. X‐ray powder diffraction studies of a representative complex were also undertaken. Th(IV) displays the coordination numbers 6, 8, 10, and 11 in these compounds depending on the nature of the coordinated anion and the stoichiometry.