Abstract
The title compound was precipitated by the action of freshly prepared Ag 2O on an aqueous solution of pyridine-2,3-dicarboxylic acid. The white compound was redissolved in hot water and crystals suitable for X-ray diffraction study were grown. The crystal is a polymeric network; five-membered chelate rings (-CNAgOC-) and dimeric units (AgOCO′) 2 sequenced in two types of similar chains linked by AgAg bonds and short intermolecular hydrogen bonds are presented simultaneously. The four Ag atoms of the asymmetric unit show two different environments. Ag(1) and Ag(2), sitting on a symmetry centre, are each included in two chelating rings. So, Ag(1) and Ag(2) are in four-coordinated planar environments: Ag(1)N(21) = 2.166(5), Ag(1)O(24) = 2.705(4), Ag(2)N(11) = 2.172(4), Ag(2)O(11) = 2.706(5) Å, N(21)Ag(1)-(1)(24) = 67.7(2), N(11)Ag(2)O(11) = 68.4(2)°. Ag(3) Ag(4) are included in eight-membered rings, (AgOCO′) 2 with bipyramidal trigonal arrangement constituted by two Ag atoms [Ag(3)(3 ii) = 2.843(2), Ag(3)Ag(4 i) = 3.090(2), Ag(4)Ag(4 v) = 2.894(1) Å, two oxygen carboxylic atoms [Ag(3)0223) = 2.271(5), Ag(3)O(24 ii) = 2.245(4), Ag(4)O(12 v) = 2.236(6), Ag(4)= 2.242(6) Å] and one aqueous oxygen atom Ag(3)O(wl) = 2.329(6), Ag(4)O(w2) = 2.399(5) Å]. The H carboxylic hydrogen atoms of the hydrogenopyridine-2,3-dicarboxylate ligands being split between two carboxylate groups are involved in short intermolecular hydrogen bonds between two carboxylic groups: 0(13) … 0(22 ii) = 2.459(4) Å.
Published Version
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