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In the title compound, [Co(C(5)H(4)N(3)O(2))(2)(H(2)O)(2)], the Co(II) atom is situated on a twofold rotation axis and is N,O-chelated by two 3-amino-pyrazine-2-carboxyl-ate anions and additionally bonded to the O atoms of two water mol-ecules, leading to a slightly distorted octa-hedral coordination environment. The crystal packing is dominated by inter-molecular O-H⋯O, O-H⋯N and N-H⋯O hydrogen bonding involving the water mol-ecules and amino groups as donors and carboxyl-ate O atoms, as well as the non-coordinating heterocyclic N atoms as acceptors, resulting in a three-dimensional network. An intra-molecular N-H⋯O hydrogen bond is also observed.

Bis(3-aminopyrazine-2-carboxylato-κ2N1,O)diaquacobalt(II)

Bis(3-aminopyrazine-2-carboxylato-κ²N¹,O)diaquacobalt(II)