RESUMEN
The title compound, [ZnCl(2)(C(10)H(14)N(4))](n), is a coordination polymer consisting of zigzag chains propagating in [001], in which the metal cation exhibits a distorted tetrahedral ZnCl(2)N(2) coordination. Adjacent chains are linked by inter-molecular C-Hâ¯Cl hydrogen bonds, forming a three-dimensional supra-molecular network.
RESUMEN
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 â¶). 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-carboxyl-ate ligands and by two water mol-ecules in a distorted octa-hedral geometry with the water mol-ecules occupying the axial sites. Inter-molecular O-Hâ¯O, O-Hâ¯N and C-Hâ¯O hydrogen bonds connect the complex mol-ecules into a two-dimensional layer parallel to (10), whereas the previously reported polymorph exhibits a three-dimensional hydrogen-bonded network.