Lanthanide Complexes with Carbacylamidophosphates : The First Registration of Chelate Coordination of the Neutral Ligand Form in the Structure of Di-(N,N'-tetramethyl-N''-benzoylphosphoryltriamide) cerium(III) Nitrate

Abstract

The coordination compounds of the general formula Ln(HL)2(NO3)3, (where Ln = La - Eu (without Pm), HL = C6H5C(O)NHP(O)[N(CH3)2]2, N,N'-tetramethyl-N''-benzoylphosphoryltriamide) have been synthesized and characterized by means of IR, UV-VIS, 1H, 31P NMR spectroscopy, and X-ray analysis. The complexes are isostructural according to X-ray powder diffraction studies. The crystal structure of the cerium(III) complex has been determined. Crystal data: monoclinic, P21/c, with a = 10.503(9), b = 15.62(2), c = 21.91(2) A° , = 99.56(8) , Z = 4, V = 3546(6) °A3, R1 = 0.0550, wR2 = 0.1383 for 6970 unique reflections used. The complex has a molecular structure. Neutral phosphoryltriamide ligands are coordinated to the metal ion in a bidentate manner via phosphoryl and carbonyl oxygen atoms with formation of six membered chelate rings. The coordination polyhedron of the Ce atom is a sphenocorona; C.N. = 10 (4 O[HL] + 6 O[NO3 ⁻]).