Dioxouranium(VI) and Thorium(IV) Complexes with Potential Tetradentate Schiff Base Ligand

Abstract

A series of dioxouranium(VI) and thorium(IV) complexes were synthesised
with the tetradentate Schiff base ligand (N₂O₂ donor set) obtained
by the condensation of o-phenylenediamine with salicylaldehyde (H₂-Salophen).
The complexes formed are of the type [UO₂(H₂L)₂]X₂,  where
X = CI^-,  I^-,   [UO₂H₂L(NO₃)₂].H₂O.C₂H₅OH,   [UO₂(HL)₂].2CH₃CO.CH₃,
[UO₂(HL)CH₃COO·H₂O],  [UO₂(H₂L)S0₄],  UO₂H₂L(SCN)₂,
[Th(H₂L)₂(NO₃)₂](NO₃)₂ and Th(H₂L)₂(SCN)₄. The complexes contain
6-coordinated UO₂²⁺ group with anions inside the coordination sphere and
12-coordinated thorium. Analytical,  UV-visible,  IR,  molar conductance,
molecular weight determination and TGA data are presented in support of
the strucures of the complexes.