Acta Cryst. (2001). E57, i77-i79  [ doi:10.1107/S1600536801013241 ]

The first `hexaaqua-' complex of the [Re₆Se₈]²⁺ cluster core, [Re₆Se₈(OH)₂(H₂O)₄]·12H₂O

Z.-P. Zheng, H. D. Selby and B. K. Roland

Abstract: The first hexaaqua/hydroxo complex of the [Re₆Se₈]²⁺ cluster species, tetraaquadihydroxohexarheniumoctaselenium dodecahydrate, is found to have unusual bonding that involves both inner and outer sphere aqua/hydroxo species. The Re, one of the Se atoms and one of the O atoms are located on a crystallographic mirror plane, and the second Se atom is located on a special position of site symmetry 3m. Only the O atom in the outer coordination sphere occupies a general position. Crystallographically imposed symmetry prohibits unambiguous identification of the ligands as water or hydroxy O atoms. A lack of counter-ions in the interstices requires the molecular formula [Re₆Se₈O₁₈] to be recast as [Re₆Se₈(OH)₂(H₂O)₄]·12H₂O

Online 10 August 2001

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