Research Article: Diaqua­bis­(pyrazine-2-carboxamide-κ2N1,O)cobalt(II) dinitrate

Date Published: April 01, 2012

Publisher: International Union of Crystallography

Author(s): Ajay Pal Singh Pannu, Seona Lee, Yongjae Lee.


The asymmetric unit of the title complex, [Co(C5H5N3O)2(H2O)2](NO3)2, contains one half of a CoII cationic unit and a nitrate anion. The entire [Co(C5H5N3O)2(H2O)2]2+ cationic unit is completed by the application of inversion symmetry at the CoII site, generating a six-coordinate distorted octa­hedral environment for the metal ion. The chelating pyrazine-2-carboxamide mol­ecules are bound to cobalt via N and O atoms, forming a square plane, while the remaining two trans positions in the octa­hedron are occupied by two coordinated water mol­ecules.

Partial Text

For the monodentate coordination mode of the pyrazine-2-carboxamide ligand, see: Azhdari Tehrani et al. (2010 ▶); Mir Mohammad Sadegh et al. (2010 ▶); Goher & Mautner (1999 ▶, 2001 ▶). For the chelating bidentate coordination mode, see: Tanase et al. (2008 ▶); Prins et al. (2007 ▶); Sekisaki (1973 ▶). For coordination by pyrazine carboxamide moieties, see: Hausmann & Brooker (2004 ▶); Cati & Stoeckli-Evans (2004 ▶).