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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.

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

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