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The title compound, [Cu(C 5 H 3 N 2 O 2 ) 2 (H 2 O) 2 ], is a new polymorph of the previously reported compound [Klein  et al.  (1982  ▶ ).  Inorg. Chem.   21 , 1891–1897]. The Cu II  atom, lying on an inversion center, is coordinated by two N atoms and two O atoms from two pyrazine-2-carboxyl­ate ligands and by two water mol­ecules in a distorted octa­hedral geometry with the water mol­ecules occupying the axial sites. Inter­molecular O—H⋯O, O—H⋯N and C—H⋯O hydrogen bonds connect the complex mol­ecules into a two-dimensional layer parallel to (10    ), whereas the previously reported polymorph exhibits a three-dimensional hydrogen-bonded network.

A polymorph of diaquabis(pyrazine-2-carboxylato-κ2N1,O)copper(II)

A polymorph of diaquabis(pyrazine-2-carboxylato-κ²N¹,O)copper(II)