Crystal and molecular structure of trinitratotris(dimethyl sulfoxide)yttrium(III)

The crystal structure of the yttrium nitrate dimethyl sulfoxide complex Y(NO3)(3)(DMSO)(3) was determined by X-ray diffraction (heavy-atom method, difference Fourier syntheses, specified H atoms, anisotropic or isotropic (for hydrogen) least-squares refinement, R = 0.0588, wR2 = 0.1228, GOOF = 1.119). The crystals are monoclinic: a = 11.559(2) Angstrom, b = 12.672(3) Angstrom, c = 13.593(3) Angstrom, beta = 100.12(3)degrees, Z = 4, space group P2(1)/n. In the molecular structure, the yttrium coordination number is 9 (three O atoms of DMSO and three pairs of O atoms of bidentate NO3 groups). The molecules are polar: the DMSO and NO3 ligands reside in different halves of the yttrium coordination sphere. The Y-O. bond lengths are essentially different (the average values are 2.455(6) Angstrom for NO3 groups and 2.278 Angstrom for DMSO).