N-substituted urea complexes of thorium and uranium tetrahalides

Abstract

Uranium tetrachloride and tetrabromide form 1 : 2 complexes with NNN′N′-tetramethylurea (tmu), NNN′N′-tetraethylurea (teu), NN′-dimethyl-NN′-diethylurea (ddeu) and NN′-dimethyl-NN′-diphenylurea (ddu), whereas uranium tetrachloride forms 1 : 4 complexes with NN′-dimethylurea (dmu) and with NNN′-trimethylurea (trmu). In contrast, the thorium tetrahalides form the 1 : 3 complexes ThCl₄,3ddu, ThCl₄,3tmu and ThBr₄,3tmu, as well as the 1 : 6 complex ThCl₄,6dmu and the 1 : 4 complex ThCl₄,4trmu, the last being the only compound isolated for the thorium halides which is of the same stoicheiometry as the uranium analogue. I.r. spectroscopic and magnetic susceptibility results are reported for these complexes.