The chemistry of uranium. Part 18. Arsine oxide and phosphine oxide complexes of uranium tetrahalides

Abstract

A comparative study has been made between various arsine oxide and phosphine oxide complexes of uranium tetrahalides both in acetone solution and in the solid state. Conductimetric. potentiometric, and spectrophotometric methods have been used in solution, spectroscopic and structural methods on solids. The significantly greater ionising power of arsine oxide ligands is indicated and is discussed together with the structural differences between arsine oxide and phosphine oxide complexes of the type UCl₄·2L and UX₄·6L [X = Cl and Br; L = AsR₃O, PR₃O, or P(NMe₂)₃O; R = Me, Et, or Ph].