Acta Cryst. (2003). E59, m759-m761  [ doi:10.1107/S1600536803017835 ]

A new tetramolybdenumcobaltdiphosphonate, Na₈[CoMo₄O₁₂{MeC(O)(PO₃)₂}₂]·18H₂O

S. Ren, G. Xue, J. Li, Q. Shi, D. Wang and J. Wang

Abstract: A new tetramolybdate-diphosphate compound with the formula Na₈[CoMo₄O₁₂{MeC(O)(PO₃)₂}₂]·18H₂O, octasodium(I) cobalt(II) tetramolybdenum(VI) bis(1-hydroxyethylidenediphosphate) octadecahydrate, has been synthesized under weakly acidic conditions (pH = 5.5-6.0). The [CoMo₄O₁₂{MeC(O)(PO₃)₂}₂]^8- anion comprises two [Mo₂O₆{MeC(O)(PO₃)₂}]^5- fragments linked by one six-coordinate Co^II atom. 1-Hydroxyethylidenediphosphonate as a pentadentate ligand bonds to two pairs of face-sharing MoO₆ octahedra. The Co atom in the anion is situated on a centre of inversion.

Online 15 August 2003

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