Uranyl complexes with pentadentate ligands. Crystal structures of UO 2[ o-OC 6H 4CHN(CH 2) 3] 2C 6H 5PO and UO 2[ o-OC 6H 4C(CH 3)N(CH 3)N(CH 2) 2] 2NH

Abstract

The crystal structures of the title complexes were determined by X-ray crystallography from single-crystal diffractometer data. Crystal data: UO 2[o-UC 6H 4CHN(CH 2) 3] 2C 6H 5PO, orthorhombic Pnma, Z = 4, a= 10.85(1) Å, b = 14.23(1) Å, c = 16.17(1) Å, V = 2497 Å 3, R = 5.7%, 1593 observed reflections; UO 2[o-OC 6H 4C(CH 3)N(CH 2) 2] 2NH, monoclinic, P2 1/c, Z = 4, a = 6.31(1) Å, b = 13.22(1) Å, c = 24.14(1) Å, β = 92.61(2)°. V = 2014 Å 3, R = 7.4% observed reflections. The complexes are monomeric. The PhPOUO 2 fragment of the first molecule lies on the crystallographic mirror plane. The coordination geometry of the uranium atom is bipyramidal pentagonal with the ligand pentadentate in the equatorial plane of the uranyl ion. Bond distances are: UO (charged) = 2.21–2.14 Å, UO (neutral) = 2.33(1) Å, UN = 2.56-2.71 Å, other distances and angles were similar to analogous complexes.