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Abstract

The structure of the solvated yttrium(III) ion in the oxygen donor solvents dimethyl sulfoxide, N,N-dimethylformamide and N,N'-dimethylpropyleneurea, OCN2Me2(CH2)(3), has been studied by means of XAFS and large angle X-ray scattering. The yttrium(III) ion co-ordinates eight solvent molecules in dimethyl sulfoxide and N,N-dimethylformamide solution with the mean Y-O bond distance 2.36(1) Angstrom. The slightly asymmetric distribution was modelled by the cumulant expansion method for the XAFS data. The Y ... S distance of the [Y(OSMe2)(8)](3+) ion in dimethyl sulfoxide solution was found to be 3.54(1) Angstrom, corresponding to a mean Y-O-S angle of 132 degrees. For the [Y(OCHNMe2)(8)](3+) ion in N,N-dimethylformamide the Y ... C distance is 3.34(1) Angstrom, giving a Y-O-C angle of 133 degrees. In N,N'-dimethylpropyleneurea solution the steric effect of the bulky solvent molecules reduces the co-ordination number to six and the mean Y-O bond distance to 2.24(1) Angstrom. The mean Y ... C distance at 3.48(2) Angstrom agrees with an analysis of the angular-sensitive multiple scattering contributions, which gave a Y-O-C angle of about 165 degrees. The crystal structures of [Y(OCN2Me2(CH2)(3))(6)]I-3 and [Y(OSMe2)(8)]I-3, determined by X-ray diffraction at room temperature, show the ionic radii of yttrium(III) to increase about 0.12 Angstrom from six to eight co-ordination.

Published in

Journal Of The Chemical Society-Dalton Transactions
2000, number: 16, pages: 2703-2710
Publisher: ROYAL SOC CHEMISTRY

SLU Authors

UKÄ Subject classification

Inorganic Chemistry
Physical Chemistry

Publication identifier

  • DOI: https://doi.org/10.1039/b005119p

Permanent link to this page (URI)

https://res.slu.se/id/publ/95565