Synthesis and properties of scandium, yttrium and lanthanum periodates. Crystal structures of Y(H2O)(3){IO4(OH)(2)} and Y(H2O)(2)(IO3)(3)

Hector, A. L., Levason, W. and Webster, M. (2000) Synthesis and properties of scandium, yttrium and lanthanum periodates. Crystal structures of Y(H2O)(3){IO4(OH)(2)} and Y(H2O)(2)(IO3)(3). Inorganica Chimica Acta, 298 (1), 43-49. (doi:10.1016/S0020-1693(99)00409-0).

Abstract

The reaction of periodic acid or alkali-metal periodates with aqueous solutions of scandium, yttrium or lanthanum salts formed white M(H2O)(3){IO4(OH)(2)} (M = Sc, Y or La). The compounds are insoluble in water, but dissolve in hot aqueous H5IO6 or mineral acids. They were characterised by analysis, IR, UV-Vis spectroscopy and TGA. The X-ray crystal structure of Y(H2O)(3){IO4(OH)(2)} shows the presence of octahedral IO6 (I-O 1.840(4)-1.943(4) Angstrom) and eight-coordinate YO8 (Y-O 2.321(5)-2.475(4) Angstrom) residues linked via edge sharing into chains. The solution chemistry of [M(H2O)(n)](3+) in the presence of H5IO6 has been partially explored by (SC)-S-45, Y-89 and La-139 NMR spectroscopy. Attempts to isolate periodate complexes with different stoichiometries have been unsuccessful. Crystals of the iodate complex Y(H2O)(2)(IO3)(3) were also obtained and the X-ray crystal structure shows the expected pyramidal IO3- groups and eight-coordinate Y (Y-O 2.290(5)-2.457(5) Angstrom).

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