Solid-State Structural Transformations of Two Ag^I Supramolecular Polymorphs to Another Polymer upon Absorption of HNO₃ Vapors

Solid-state structural transformation of two polymorphic forms of [Ag­(8-HqH)­(8-Hq)]n (1α and 1β, 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 1α and 1β with HNO3 vapors. Solid–gas reaction of compound 2 with hydrated vapors of NH3 results in the formation of only the 1β polymorph, while solid–solid reaction of compound 2 with KOH results in the formation of a 1α and 1β mixture with chiral and achiral space groups of P212121 and Pbcn, respectively.