title: Bis[5-(pyridin-2-yl)pyrazine-2-carbo-nitrile-κN,N]silver(I) perchlorate.
abstract: In the mononuclear title complex, [Ag(C(10)H(6)N(4))(2)]ClO(4), the Ag(I) ion is surrounded by two 5-(pyridin-2-yl)pyrazine-2-carbonitrile ligands, forming a considerably distorted square-planar N(4)-coordination geometry, with two short and two long Ag-N distances. Each perchlorate anion links two mononuclear coordination units through C-H⋯O(perchlorate) hydrogen bonding, forming an infinite tape structure along [110]. Inter-molecular π-π stacking inter-actions between adjacent pyridine and pyrazine rings [centroid-centroid distances of 3.777 (3) and 3.879 (2) Å] further assemble the tape motifs into a three-dimensional supra-molecular structure.
authors.affiliation: Department of Chemistry, Capital Normal University, Beijing 100048,  People's Republic of China.
authors.forename: Fan
authors.initials: F
authors.lastname: Zhang
authors.forename: Zhi-Wei
authors.initials: ZW
authors.lastname: Wang
authors.forename: Yong-Li
authors.initials: YL
authors.lastname: Yang