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

Abstract

The compounds of general formula [Ln(DMF) 3- (H 2O) 6](CF 3SO 3) 3 (Ln = LaEu, Tb, Dy) were synthesized and characterized by microanalysis, conductance measurements, IR absorption (Nd 3+) and emission (Eu 3+) 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 Å 3, M = 918.4, Z = 1, D c = 1.73 g cm −3, λ(Mo Kα) = 0.71073 Å, μ = 1.65 mm −1, F(000) = 456, R = 0.056, R w = 0.057, for 2979 independent reflections with I > 3σ( I). Nd 3+ 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 C 3 v .