COORDINATION CHEMISTRY OF N-METHYLIMIDAZOLE WITH YTTRIUM AND CERIUM

Abstract

Abstract YCl3 crystallizes in the presence of N-methylimidazole (N-MeIm) to form [YCl2(N-MeIm)5]+ [YCl4(N-MeIm)2]−, 1 or [YCl2(N-MeIm)5]+[C1]-, 2, depending upon crystallization conditions. The bromide analog of 2, [YBr2(N-MeIm)5]+[Br]−, 3, has been obtained from YBr3(THF)3 and N-MeIm. Both 1 and 2 contain seven coordinate pentagonal bipyramidal [YCl2(N-MeIm)5]+ cations which have chloride atoms in the axial ligand positions. The anion in 1 has a trans octahedral geometry. Ceric ammonium nitrate crystallizes from N-MeIm to form Ce(NO3)3(N-MeIm)4, 4, which contains a formally ten-coordinate cerium center. 4 is best described as a seven coordinate distorted pentagonal bipyramid with the NO3 ligands occupying one axial and two equatorial sites. 1 crystallized from N-MeIm in the space group P1 with a = 8.1435 (10) A, b = 9.0448(8) A, c = 15.103(2) A, α = 93.872 (10)°, β = 94.117(11)°, γ = 107.288(9)°, V = 1054.8(2) A3 and Dcalcd = 1.520 Mg/m−3 for Z = 1. Least squares refinement of the model based on 3375 ref...