Spectroscopic characterization of lanthanide complexes with N,N '-tetraethyl-N ''-benzoylphosphoryltriamide. Crystal structure of tris(N,N '-tetraethyl-N ''-benzoylphosphoryltriamide) cerium(III) trinitrate complex

A new range of lanthanide compounds of the formula Ln(HL)(3)(NO3)(3) where Ln=La, Ce-Nd, Sm-Lu, Y; HL = C6H5C(O)N(H)P(O)[N(CH2CH3)(2)](2)-N,N'-tetraet hy-N " -benzoylphosphoryltriamide have been prepared and characterized by m eans of IR,H-1, P-31 NMR and UV-Vis spectroscopies. The compounds are isomo rphous according to X-ray powder diffraction studies. The crystal and molec ular structure of Ce(HL)(3)(NO3)(3) has been determined by X-ray diffractio n studies. The complex has a molecular structure. The monodentate neutral p hosphoryltriamide ligands are coordinated to the metal ion via phosphoryl o xygen atom. The coordination polyhedron of Ce is a tricapped trigonal prism , CN = 9 [6O(NO3-) + 3O(P-O)]. By UV-Vis spectroscopy it was shown that in acetonitrile solution the neodymium complex with molar ratio 1:3 (Nd3+:HL) exists: (stability constant = 2.56). (C) 2000 Elsevier Science B.V. All rig hts: reserved.