Acta Cryst. (2002). E58, m599-m601  [ doi:10.1107/S1600536802017385 ]

Hexaaquacobalt(II) tetrapotassium diethylenediaminetetraacetato(4-)cobaltate(III) -octamolybdate hexahydrate

U. Lee, H.-C. Joo and M.-A. Cho

Abstract: Crystals of the title double salt, K₄[Co^II(H₂O)₆][Co^III(C₁₀H₁₂N₂O₈)]₂[-Mo₈O₂₆]·6H₂O, were prepared by the hydrothermal reaction of K₃[Co^IIIMo₆O₁₈(OH)₆]·nH₂O with Na₂H₂edta and CoCl₂ (edta is ethylenediamine tetraacetic acid). The compounds contain -octamolybdate, [-Mo₈O₂₆]^4-, and ethylenediaminetetraacetato(4-)cobaltate(III), [Co^III(edta)]^-, complex anions. The counter-cations are [Co^II(H₂O)₆]²⁺ and K⁺. The [-Mo₈O₂₆]^4- anion and [Co^II(H₂O)₆]²⁺ cations have inversion centers. The bond-length ranges are as follows: Co^III-O in [Co(edta)]^- 1.882  (4)-1.917  (4)  Å, Co^III-N in [Co(edta)]^- 1.922  (4)-1.931  (4)  Å, Co^II-O in [Co(H₂O)₆]²⁺ 2.062  (4)-2.141  (4)  Å, and Mo-O in [Mo₈O₂₆]^4- 1.690  (4)-1.716  (4)  Å (Ot), 1.742  (3)-2.265  (3)  Å (Ob), 1.939  (3)-2.348  (3)  Å (Oc), 2.187  (3)-2.472  (3)  Å (Of), where Ot are terminal O atoms, Ob bridging O atoms bound to two Mo atoms, Oc central O atoms bound to three Mo atoms and Of central O atoms bound to five Mo atoms.

Online 30 September 2002

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