Date Published: June 01, 2010
Publisher: International Union of Crystallography
Author(s): José A. Fernandes, Ana I. Ramos, Patrícia Silva, Susana S. Braga, Paulo Ribeiro-Claro, João Rocha, Filipe A. Almeida Paz.
In the title complex, [Cu(C2H8N2)2(H2O)2](C13H9O2)2·2.66H2O, the CuII centre (located at an inversion centre) is coordinated by two bidentate ethylenediamine (en) ligands and two water O atoms in a typical Jahn–Teller distorted octahedral geometry. The amino groups and the water molecules are disordered over two distinct crystallographic positions with occupancies of 1/3 and 2/3. In the crystal, the cations and anions are disposed in alternating layers. One of the water molecules of crystallization is disordered and the other has a fractional occupation. In the 2/3 occupancy component, water molecules are organized into a chain composed of hexameric units interconnected by carboxylate bridges.
For general background to reactions based on the copper cation, see: Graham et al. (2000 ▶); Majumder et al. (2006 ▶); Rao et al. (2004 ▶); Zhao et al. (2009 ▶). For examples of framework-type structures of hybrid materials comprising carboxylate anions, see: Eddaoudi et al. (2001 ▶). For general background to crystal engineering approaches from our research group, see: Paz & Khimyak et al. (2002 ▶); Paz & Bond et al. (2002 ▶); Paz & Klinowski (2003 ▶); Paz et al. (2005 ▶); Shi et al. (2008 ▶). For a description of the graph-set notation for hydrogen-bonded aggregates, see: Grell et al. (1999 ▶).