Crystal structure of μ-cyanido-1:2κ<sup>2</sup><i>N</i>:<i>C</i>-dicyanido-1κ<i>C</i>,2κ<i>C</i>-bis(quinolin-8-amine-1κ<sup>2</sup><i>N</i>,<i>N</i>′)-2-silver(I)-1-silver(II): rare occurrence of a mixed-valence Ag<sup>I,II</sup>compound
Acta crystallographica. Section E, Crystallographic communications