Coordination compounds of lanthanide nitrates with dimorpholido-N-trichloroacetylphosphorylamide. the structure of di(dimorpholido-N-trichloroacetylphosphorylamide)-diaqua neodymium(III)trinitrate

The coordination compounds of the general formula Ln(NO3)(3)(HL)(2)(H2O)(2) . H2O, where Ln = La, Ce - Nd, Sm - Dy, HL = CCl3 C(O)NHP(O)[N(CH2CH2)(2)O] (2), dimorpholido-N-trichloroacetylphosphorylamide, have been synthesized. The complexes were studied by IR, H-1 and P-31 NMR and UV-VIS absorption sp ectroscopies. X-ray diffraction analyses indicate that all synthesized comp ounds are isostructural. The crystal structure of Nd(NO3)(3)(HL)(2)(H2O)(2) . H2O was solved (monoclinic, a = 11.0467(3), b = 15.9080(5), c = 24.1921(7 ) Angstrom, beta = 96.4080(10)degrees space group P2(1)/n, V = 4224.7(2) An gstrom(3), Z = 4, R = 0.049, omega R = 0.0915). The complex has a molecular structure. The monodentate neutral phosphorictriamide li,ligands are coord inated to the metal atom via the phosphoryl oxygen atom. The coordination p olyhedron of Nd is a sphenocorona; C.N. = 10 (6O[NO3-], 2O[HL], 2O[H2O]). It was shown that these compounds in methanol solution are 1:1 electrolytes , and in acetone solution weak electrolytes. According to NMR data in aceto ne solution the complexes of the lanthanides with the ligand {HL} have axia l symmetry.