Abstract
The title compound, [Cu(C5H3N2O2)2(H2O)2], is a new polymorph of the previously reported compound [Klein et al. (1982 ▶). Inorg. Chem. 21, 1891–1897]. The CuII 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.
Highlights
The State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People’s
H O, O—H N and C—H O hydrogen bonds connect the complex molecules into a two-dimensional layer parallel to
Symmetry codes: (ii) x+1/2, −y+3/2, z+1/2; (iii) x+1/2, −y+1/2, z+1/2
Summary
H O, O—H N and C—H O hydrogen bonds connect the complex molecules into a two-dimensional layer parallel to (101), whereas the previously reported polymorph exhibits a three-dimensional hydrogen-bonded network
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