A new three-dimensional silver(I) coordination framework with a diamondoid topology constructed from 2-(pyridin-4-yl)-1H-imidazole-4,5-dicarb­oxy­lic acid

The title compound, poly[[[mu]₄-5-carb­oxy-4-carboxyl­ato-2-(pyri­din-4-yl)-1H-imidazol-1-ido]disilver(I)], [Ag₂(C₁₀H₅N₃O₄)]_n, was synthesized by reacting silver nitrate with 2-(pyridin-4-yl)-1H-imidazole-4,5-dicarb­oxy­lic acid (H₃PyIDC) under hydro­thermal conditions. The asymmetric unit contains two crystallographically independent Ag^I cations and one unique HPyIDC^2- anion. Both Ag^I cations are three-coordinated in distorted T-shaped coordination geometries. One Ag^I cation is coordinated by one N and two O atoms from two HPyIDC^2- anions, while the other is bonded to one O and two N atoms from two HPyIDC^2- anions. It is inter­esting to note that the HPyIDC^2- group acts as a [mu]₄-bridging ligand to link the Ag^I cations into a three-dimensional framework, which can be simplified as a diamondoid topology. The thermal stability and photoluminescent properties of the title compound have also been studied.