Acta Cryst. (2004). E60, m637-m640  [ doi:10.1107/S1600536804008979 ]

Tetrakis(2,2'-bipyridine)tetra-₃-hydroxo-di--trifluoroacetato-tetracobalt(II) diiodide diacetonitrile monohydrate: a compound containing a tetranuclear `cubane'-type cobalt(II) core

H. Zhao, J. Bacsa and K. R. Dunbar

Abstract: A new compound, [Co₄(C₂F₃O₂)₂(OH)₄(C₁₀H₈N₂)₄]I₂·2C₂H₃N·H₂O, containing a tetranuclear cobalt(II)-hydroxo core with a cube-like structural geometry is reported. The four Co^II coordination polyhedra are irregular octahedra and the Co^II atoms are linked by three hydroxo and trifluoroacetate ions resulting in a Co₄O₄ core with approximate tetrahedral symmetry. The coordination polyhedra share edges with short CoCo distances. A bond valence analysis shows that a cube-like arrangement of atoms in a tetranuclear cluster is ideal for the clusters [M₄(OR)₄]⁴⁺ (R is a strongly binding group) and [M₄O₄]⁸⁺ when the metal ions are in oxidation states of +2 and +4, respectively.

Online 24 April 2004

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