Research Article: Aqua­(2,2′-bipyridine-κ2N,N′)(2-methyl­malonato-κ2O1,O3)copper(II) dihydrate

Date Published: July 01, 2012

Publisher: International Union of Crystallography

Author(s): P. Manochitra, N. Manikandan, S. Murugavel, R. Sreeshailam, P. Sambasiva Rao.


In the title compound, [Cu(C4H4O4)(C10H8N2)(H2O)]·2H2O, the CuII ion displays a slightly distorted square-pyramidal coordination. The water mol­ecule at the apical position shows a long bond [Cu—O = 2.276 (2) Å]. The basal plane is formed by two N atoms of the 2,2′-bipyridine ligand and two carboxyl­ate O atoms from a malonate group. The five-membered chelate ring is almost planar [maximum deviation = −0.006 (2) Å], while the six-membered chelate ring defined by the malonate ligand adopts a distorted boat conformation. In the crystal, CuII complex mol­ecules and lattice water mol­ecules are connected by O—H⋯O and C—H⋯O hydrogen bonds. The crystal packing is further stabilized by π–π inter­actions [centroid–centroid distances = 3.563 (2)–3.828 (2) Å].

Partial Text

For background to the applications of copper(II)–malonate complexes, see: Braga et al. (1998 ▶); Suresh & Bhadbhade (1997 ▶). For related structures, see: Gasque et al. (1998 ▶); Cui et al. (2005 ▶). For ring puckering analysis, see: Cremer & Pople (1975 ▶).




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