Poly[bis(μ2-2-aminopyrazine-κ2N1:N4)(μ2-nitrato-κ2O:O)(nitrato-κ2O,O′)disilver(I)]: an achiral two-dimensional coordination polymer forming chiral crystals
Abstract
The solution reaction of AgNO3 and 2-aminopyrazine (apyz) in a 1:1 ratio gives rise to the title compound, [Ag2(NO3)2(C4H5N3)2]n, (I), which possesses a chiral crystal structure. In (I), both of the crystallographically independent AgI cations are coordinated in tetrahedral geometries by two N atoms from two apyz ligands and two O atoms from nitrate anions; however, the AgI centers show two different coordination environments in which one is coordinated by two O atoms from two different symmetry-related nitrate anions and the second is coordinated by two O atoms from a single nitrate anion. The crystal structure consists of one-dimensional AgI–apyz chains, which are further extended by μ2-κ2O:O nitrate anions into a two-dimensional (4,4) sheet. N—H...O and Capyz—H...O hydrogen bonds connect neighboring sheets to form a three-dimensional supramolecular framework.
