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Synthesis, properties and structure of hexaaquo-tris(N,N-dimethylformamide)-lanthanide trifluoromethanesulfonates

1988; Elsevier BV; Volume: 146; Issue: 1 Linguagem: Inglês

10.1016/s0020-1693(00)80038-9

1873-3255

Dulce Maria de Araújo Melo, G. Vicentini, L.B. Zinner, C.A. De Simone, E.E. Castellano,

Organometallic Complex Synthesis and Catalysis

The compounds of general formula [Ln(DMF)3- (H2O)6](CF3SO3)3 (Ln = LaEu, Tb, Dy) were synthesized and characterized by microanalysis, conductance measurements, IR absorption (Nd3+) and emission (Eu3+) spectra. The crystal structure of the neodymium compound was determined by X-ray diffraction techniques. The compound crystallizes in the triclinic system, space group P1, a = 8.589(4), b = 11.222(2), c = 12.271(2) Å, α = 56.83(2), β = 62.13(2), γ = 75.14(2)°, V = 875.2 Å3, M = 918.4, Z = 1, Dc = 1.73 g cm−3, λ(Mo Kα) = 0.71073 Å, μ = 1.65 mm−1, F(000) = 456, R = 0.056, Rw = 0.057, for 2979 independent reflections with I > 3σ(I). Nd3+ is coordinated to the oxygen atoms of six independent water molecules at a mean distance NdO = 2.52(1) Å, and to the oxygen atoms of three independent DMF groups at a mean distance NdO = 2.40(2) Å. The coordination polyhedron is a tricapped trigonal prism of point symmetry C3v.