Acta Cryst. (2003). E59, m165-m167  [ doi:10.1107/S1600536803005567 ]

catena-Poly[disodium [[tris(formato-O)copper(II)]-₂-formato-²O:O']], with partial substitution of formate by acetate, Na_2n[Cu(O₂CH)_4-x(O₂CCH₃)_x]_n (x = 0.28)

A. Golobic, K. Klancar and P. Segedin

Abstract: The structure of the title compound, Na₂[Cu(CHO₂)_3.72(C₂H₃O₂)_0.28], is built of sodium cations and Cu^II complex anions; the latter are linked into infinite chains. The Cu^II 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 Cu^II 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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