Acta Cryst. (2007). E63, i5-i7  [ doi:10.1107/S1600536806052883 ]

Dipotassium heptahydrogenhexamolybdochromate(III) octahydrate, the first heptaprotonated Anderson-type polyoxometalate

U. Lee

Abstract: The title compound, K₂[H₇CrMo₆O₂₄]·8H₂O, contains an unexpectedly protonated polyanion, [H₇CrMo₆O₂₄]^2- in the B series Anderson-type heteropolyoxomolybdate. It was obtained by recrystallizing K₃[H₆CrMo₆O₂₄]·nH₂O at pH 1.80. The asymmetric unit contains two crystallographically independent polyanions that have C_i () symmetry. Six O atoms of the central CrO₆ octahedron and one atom of an edge-shared MoO₆ octahedron are protonated.

Online 15 December 2006

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