Synthesis and characterization of dioxouranium(VI) and thorium(lV) complexes of 2-(2'-hydroxyphenyl)benzimidazole and 2-(2'-pyridyl)benzoxazole

Abstract

The bidentate ligand 2-(2'-hydroxyphenyl)benzimidazole (L).forms mononuclear complexes of the type UO₂L₂X₂(X=Cl, I, NCS, NO₃, CH₃COO, 0.5 SO₄) and ThL₂X₄ (X=I, NCS, NO₃), whereas the biheterocyclic bidentate ligand 2-(2'-pyridyl)benzoxazole (L¢) forms complexes of the type UO₂L'X₂(X = CI, NCS, NO₃, CH₃COO, 0.5 SO₄) and ThLX₄(X= NCS, NO₃). The complexes are characterized by elemental analyses, conductivity and thermogravimetric. measurements and IR as well as ¹H and ¹³C NMR spectral studies.