title: Diaqua-bis-(pyrazine-2-carboxamide-κ(2)N(1),O)cobalt(II) dinitrate.
abstract: The asymmetric unit of the title complex, [Co(C(5)H(5)N(3)O)(2)(H(2)O)(2)](NO(3))(2), contains one half of a Co(II) cationic unit and a nitrate anion. The entire [Co(C(5)H(5)N(3)O)(2)(H(2)O)(2)](2+) cationic unit is completed by the application of inversion symmetry at the Co(II) site, generating a six-coordinate distorted octa-hedral environment for the metal ion. The chelating pyrazine-2-carboxamide mol-ecules are bound to cobalt via N and O atoms, forming a square plane, while the remaining two trans positions in the octa-hedron are occupied by two coordinated water mol-ecules.
authors.affiliation: Department of Earth System Sciences, Yonsei University, Seoul 120-749,  Republic of Korea.
authors.forename: Ajay Pal Singh
authors.initials: AP
authors.lastname: Pannu
authors.forename: Seona
authors.initials: S
authors.lastname: Lee
authors.forename: Yongjae
authors.initials: Y
authors.lastname: Lee