Preparation and crystal structure of diaquabis(1,2-naphthoquinone-2-oximato-ON)dioxouranium(VI)–trichloromethane (1/2) and aquabis(1,2-naphthoquinone-1-oximato-ON)(triphenylphosphine oxide)dioxouranium(VI)

Abstract

Two complexes of a uranyl group with the anions of nitrosonaphthols have been prepared and their crystal structures have been determined by X-ray crystallography. The first compound [UO₂(L¹)₂(H₂O)₂]·2CHCl₃(L¹= 1,2-napthoquinone-2-oximate) is triclinic, space group P, with a= 11.975(5), b= 10.536(5), c= 6.372(5)Å, α= 86.51(3), β= 99.68(3), γ= 113.75(3)°, and Z= 1. The second compound [UO₂(L²)₂(OPPh₃)(H₂O)](L²= 1,2-naphthoquinone-1-oximate) is triclinic, space group P, with a= 14.527(5), b= 12.115(5), c= 10.932(5)Å, α= 104.35(3), β= 108.15(3), γ= 97.21(3)°, and Z= 2. In both cases co-ordination of L¹ and L² to uranium is achieved through bidentate bonding from the oxygen and nitrogen atoms of the nitroso-groups. Both complexes are stabilized by intramolecular hydrogen bonds.