Acta Cryst. (2005). E61, m1677-m1679  [ doi:10.1107/S1600536805024165 ]

-Oxalato-⁴O¹,O²:O^1',O^2'-bis[aqua(2,2'-bipyridyl-²N,N')copper(II)] bis(hydrogen squarate)

S. Reinoso, P. Vitoria, L. San Felices, L. Lezama and J. M. Gutiérrez-Zorrilla

Abstract: The title compound, [Cu₂(C₂O₄)(C₁₀H₈N₂)₂(H₂O)₂](C₄HO₄)₂, contains a dinuclear -oxalato-dicopper(II) complex cation in which the oxalate ligand (ox) bridges the Cu atoms in a bis-bidentate fashion. The square-pyramidal environment of each Cu atom is completed by the two N atoms of the 2,2'-bipyridine ligand (bpy) and by one apical water molecule. The hydrogen squarate counter-anions (Hsq) form cyclic dimeric units through strong O-HO hydrogen bonds. The crystal structure shows alternating hydrogen-bonded complex cations and cyclic anionic units.

Online 6 August 2005

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