Solid-state structural transformation of two polymorphic forms of [Ag(8-HqH)(8-Hq)](n) (1 alpha and 1 beta, where 8-HqH = 8-hydroxyquinoline and 8-Hq(-) = 8-hydroxyquinolate) to {[Ag(8-HqH)(2)]NO3}(n) (2) has been observed upon solid-gas reaction of compounds 1 alpha and 1 beta with HNO3 vapors. Solid-gas reaction of compound 2 with hydrated vapors of NH3 results in the formation of only the 1 beta polymorph, while solid-solid reaction of compound 2 with KOH results in the formation of a la and 1 beta mixture with chiral and achiral space groups of P2(1)2(1)2(1) and Pbcn, respectively.