Acta Cryst. (2008). E64, m1463-m1464  [ doi:10.1107/S1600536808034296 ]

catena-Poly[[[tetrakis(-2-butenoato)dicopper(II)]--2-butenoato-[diaqua(2-butenoato)holmium(III)]-di--2-butenoato-[diaqua(2-butenoato)holmium(III)]--2-butenoato] trihydrate]

M. Perec, M. T. Garland and R. Baggio

Abstract: The title compound {[Cu₂Ho₂(C₄H₅O₂)₁₀(H₂O)₄]·3H₂O}_n, is a one-dimensional 3d/4f organic-inorganic hybrid complex, the Ho^III member of the isotypic lanthanoid series with Ln = Gd^III, Er^III and Y^III. The structure shows an alternation of Cu₂ and Ho₂ dinuclear units bridged by the ligands and hydrogen bonds only. The chains are composed of Cu₂ classical dinuclear ¹:¹:₂ fourfold bridges [CuCu = 2.6417 (9) Å] and of Ho₂ units bridged by two ²:¹:₂ carboxylate units. This results in distorted square-based pyramidal CuO₅ units and irregular HoO₉ units. The alternating Cu₂ and Ho₂ units are bridged into linear arrays along the a axis by a set of one ²:¹:₂ carboxylate O atom and two hydrogen bonds with CuHo separations of 4.4883 (10) and 4.5086 (10) Å. The distance between adjacent chains, as calculated by the closest and furthest distances between two chains, covers the range 10-14 Å. The H atoms of the water molecules could not be located, but the OO separations for these species suggest the presence of O-HO hydrogen bonds.

Online 25 October 2008

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