Acta Cryst. (2009). E65, m1511  [ doi:10.1107/S1600536809045371 ]

A polymorph of diaquabis(pyrazine-2-carboxylato-²N¹,O)copper(II)

G.-H. Wang, R.-L. He, F.-J. Meng, N.-H. Hu and J.-W. Xu

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 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-HO, O-HN and C-HO 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.

Online 4 November 2009

Copyright © International Union of Crystallography
IUCr Webmaster