title: Kitaigorodsky revisited: polymorphism and mixed crystals of acridine/phenazine.
abstract: Non-stoichiometric molecular mixed crystals have potential as functional materials, the properties of which can be tailored by rationally changing their composition. The guidelines for their preparation were summarized over thirty years ago by Alexander Kitaigorodsky. Here those principles are revised in light of new studies on the acridine/phenazine system, and solvent-assisted grinding is presented as a convenient synthetic procedure to afford a more homogeneous product than traditional solvent-evaporation methods. Finally, the proposed prerequisite of crystal isostructurality/isomorphicity for the pure compounds, which seems to be violated in the present case, is discussed.
authors.affiliation: Department of Chemistry, Ben-Gurion University of the Negev, P.O. Box 653, Beer Sheva 84120 (Israel).
authors.forename: Einat
authors.initials: E
authors.lastname: Schur
authors.forename: Elisa
authors.initials: E
authors.lastname: Nauha
authors.forename: Matteo
authors.initials: M
authors.lastname: Lusi
authors.forename: Joel
authors.initials: J
authors.lastname: Bernstein
keywords: crystal engineering; heterocycles; mixed crystals; polymorphism; solid solutions