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In the title mononuclear complex, [Ag(C 9 H 7 N 3 S) 2 ]BF 4 , the Ag I  ion adopts a virtually linear coordination geometry [N—Ag—N = 178.06 (11)°] with the two ligands bound to the metal atom  via  the pyridine N atoms. The metal-coordinated pyridine rings are almost coplanar, making a dihedral angle of 1.5 (2)°, while the two pendent pyrazine rings are arranged on the same side of the N—Ag—N line. Along the  a  axis, the mononuclear coordination units are stacked with π–π inter­actions between the pyridine rings [centroid–centroid distance = 3.569 (4) Å], leading to infinite chains. The chains are inter­connected through inter­molecular N(pyrazine)⋯π(pyrazine) inter­actions forming layers parallel to the  ab  plane [N⋯centroid = 3.268 (5) Å]. These layers are further stacked along the  c -axis direction, furnishing a three-dimensional supra­molecular framework with the tetra­fluoridoborate anions embedded within the inter­stices.

Bis{2-[(pyridin-4-yl-κN)sulfanyl]pyrazine}silver(I) tetrafluoridoborate