January 2012 issue
Cover illustration: The considerably distorted tetrahedral coordination environment of the Ag(I) atom in the complex cation of the salt [Ag(C10H6N4)2]PF6 is defined by two 2N,N'-chelating 5-(pyridin-2-yl)pyrazine-2-carbonitrile ligands. Weak intermolecular interactions between the cations result in the formation of interstices in which the PF6- counter-anions are embedded. See Wang [Acta Cryst. (2012). E68, m5].