catena-Polydiaqua­nickel(II)-μ-pyrazine-2-carboxyl­ato-silver(I)-μ-pyrazine-2-carboxyl­ato nitrate dihydrate

摘要

In the polymeric complex of the title compound, {[AgNi(C5H3N2O2)2(H2O)2]NO3·2H2O}n, the Ag^I ion displays an angular coordination geometry with two N atoms from pyrazine-2-carboxyl­ate ligands, and the Ni^II ion is hexa­coordinated by two O atoms from two water mol­ecules, two O and two N atoms from pyrazine-2-carboxyl­ate ligands in a distorted octa­hedral geometry. In the crystal, the Ag^I and Ni^II ions lie on a mirror plane and an inversion centre, respectively. The complex chains, the nitrate ions and the uncoordinated water mol­ecules are linked together through O—H⋯O hydrogen bonds and weak Ag⋯O inter­actions [2.619 (17)–2.749 (17) Å] into a three-dimensional network.