Syntheses and Crystal Structures of bis-1,3-Dimethoxyethan-trichloro- samarium(III) and tris-N,N-Diisopropylcarbamato-samarium(III)

Abstract

Diisopropylcarbamate of samarium was obtained as pale yellow crystals by the reaction of diisopropyl amine, gaseous CO2 and SmCl 3(DME)2 (DME = 1,2-dimethoxyethane) in toluene as solvent (Sm4(O2CNiPr2)12, C 2/c, Z = 4, a = 2914.2(2); b = 1974.2(1), c = 2328.7(2) pm, T = 200 K, R1 = 0.0345, 15050 independent reflections, 590 refined parameters). In the solid Sm(O 2C-NiPr2)3 forms tetramers in which samarium is coordinated by carbamate ligands which also serve as a bridging ligand. SmCl3(DME)2 is obtained as colorless crystals from Sm2O3 and SOCl2 in DME (SmCl 3(DME)2, P21/c, Z = 4, a = 1160.8(2); b = 898.9(2), c = 1572.9(2) pm, R1 = 0.0349, 4639 independent reflections, 146 refined parameters). SmCl3(DME)2 forms monomeric molecules in which samarium is coordinated by three C1 and two DME in a distorted pentagonal bipyramidal way.