Acta Cryst. (2003). E59, m165-m167 [ doi:10.1107/S1600536803005567 ]
Abstract: The structure of the title compound, Na2[Cu(CHO2)3.72(C2H3O2)0.28], is built of sodium cations and CuII complex anions; the latter are linked into infinite chains. The CuII atoms are coordinated by five O atoms belonging to five formate ligands, forming a distorted square-pyramidal coordination. Four symmetry-independent formate ligands are bonded to the Cu atom with Cu-O distances in the range 1.9370 (10)-1.9886 (8) Å. The fifth formate ligand, bonded to the CuII atom at a longer distance of 2.2889 (9) Å, forms a bridge to the neighbouring copper(II) ion which is symmetry-related to the original ion by a twofold screw axis. Thus, infinite chains are formed along the b axis. One of the terminal formate ligands is disordered; 28.4 (13)% of its sites are occupied by acetate, which was present in the starting material and was not completely displaced in the course of the reaction.
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