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Acta Cryst. (2012). E68, m1329
[ doi:10.1107/S1600536812040846 ]


J. Li, X. C. Jia, J. Qi, Y. Y. Liu and Y. Ding

Abstract: In the asymmetric unit of the title compound, [Ag(C10H6N4)2(CF3CO2)], there two mononuclear but slightly different complex units. In each, two [kappa]2N:N-chelating 5-(pyridin-2-yl)pyrazine-2-carbonitrile ligands surround the AgI atom, giving an N4O square-pyramidal coordination geometry with one trifluoroacetate O atom at the apex. The difference between the two lies in the Ag-N bond lengths: in one complex, three normal [range 2.272 (5)-2.552 (5) Å] and one long [2.706 (4) Å] and in the second, two normal [2.254 (5) and 2.290 (5) Å] and two long [2.647 (5) and 2.675 (5) Å] are present. Short intermolecular F...F contacts [2.586 (4) Å] and weak [pi]-[pi] stacking interactions [minimum ring centroid separation 3.836 (5) Å] between pyridyl and pyrazinyl rings connect the complex units, forming columns which extend along the b-axis direction.

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