Research Article: Diaqua­bis­(2-oxo-2H-chromene-3-carboxyl­ato)copper(II)

Date Published: June 01, 2011

Publisher: International Union of Crystallography

Author(s): Yue Cui, Qian Gao, Huan-Huan Wang, Lin Wang, Ya-Bo Xie.


In the title compound, [Cu(C10H5O4)2(H2O)2], the CuII atom lies on a crystallographic inversion center and exhibits an octa­hedral coordination defined by two O atoms from water mol­ecules in the axial positions and by four O atoms from two deprotonated coumarin-3-carb­oxy­lic acid ligands in the equatorial positions. The angles around the CuII atom vary between 85.32 (6) and 94.68 (6)°. The Cu—O bond distances between the CuII atom and the O atoms vary between 1.9424 (14) and 2.3229 (15) Å. The layers inter­digitate via face-to-face aromatic inter­actions [3.6490 (8) Å] between coumarin moieties such that the inter­layer separation is 10.460 (2) Å, i.e. the length of the c axis. O—H⋯O hydrogen bonds between the H atoms of coordinated water mol­ecules and the O atoms of carboxyl­ate groups link the complex mol­ecules into layers parallel to the ab plane.

Partial Text

For background to topological networks, see: Laza­rou et al. (2011 ▶). For applications of copper(II) complexes, see: Eddaoudi et al. (2001 ▶); Kirillov et al. (2010 ▶); Konidaris et al. (2009 ▶). For related structures, see: Wang et al. (2011 ▶).




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