Identification of the dysprosium(III) chloride solvate DyCl3(THF)3.5: crystal structure of the ion pair [trans-DyCl2(THF)5] [trans-DyCl4(THF)2

Abstract

Abstract Treatment of DyCl3(H2O)6 with thionyl chloride in the presence of tetrahydrofuran provided colourless crystals of DyCl3(THF)3.5, subsequently identified as the ionic salt [trans-DyCl2(THF)5] [trans-DyCl4(THF)2] by an X-ray diffraction study. The dysprosium atom in the monocation is seven coordinate with the trans-DyCl2 unit [Dy-Cl, 2.624(5)A˚] surrounded by five tetrahydrofuran molecules (Dy-O, mean 2.41(2)A˚) in a regular pentagonal bipyramidal geometry. For the anion the dysprosium atom is six coordinate with an octahedral geometry comprising four equatorial chlorine atoms (Dy%z.sbnd;Cl, mean 2.642(5)A˚) and two axial tetrahydrofuran molecules (Dy-O, 2.41(2)A˚).