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The methanesulfonates of trivalent lanthanides, Ln(CH(3)SO(3))(3), xH(2)O (Ln=Ce, Sm and Tb with x=2 and Ln=Yb with x=0), have been prepared by the reaction of methanesulfonic acid with the respective lanthanide oxide (Ce(2), Sm(2)O(3), Tb(4)O(7) and Yb(2)O(3)) in the presence of water. In the reactions involving cerium and terbium oxides, hydrogen peroxide was used as reducing agent. Single crystals, suitable for X-ray examination, were obtained by slow evaporation of water-ethyl alcohol (50:50, v/v) solution. The isostructural tri-s(methanesulfonate)dihydrates of the trivalent Ce, Sm and Tb crystallize in the monoclinic system, space group P21/c (14), with Z=4, and cell parameters: a=948.9(1); b=1431.9(2); c=983.7(1) pm, beta=91.22(2) for Ce; a=938.1(1), b=1417.9(2), c=974.3(3) pm, beta=91.19(2) for Sm; and a=931.3(3), b=1407.2(3), c=966.4(3) pm, beta=91.09(3) for Tb. Also the water-free ytterbium compound crystallizes in the monoclinic system, however the space group is P2, (4), with two molecules per elementary cell. Its crystallographic parameters are a=979.8(5), b=509.4(2), c=1183.7(5) pm and beta=107.16(4) . In all investigated compounds the methanesulfonate anion acts as a bidentate ligand, bridging two metallic centres to yield polymeric structures.

Additional information

Authors: ARICÓ E M, Universidade de São Paulo, Instituto de Quimica (BR);ZINNER L B, Universidade de São Paulo, Instituto de Quimica (BR);APOSTOLIDIS C, Forschungszentrum Karlsruhe GmbH (DE);REBIZANT J, Forschungszentrum Karlsruhe GmbH (DE);DORNBERGER E, JRC Karlsruhe (DE);KANELLAKOPULOS B, JRC Karlsruhe (DE);ARICO E M, Universidade de S?o Paulo, Instituto de Quimica (BR)
Bibliographic Reference: Article: Journal of Alloys and Compounds, Vol. 249 (1997) pp. 111-115
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