Whisker Formation in the Presence of Anthraquinone

Abstract

IT has been shown¹ that nitrogen-substituted amino-anthraquinone compounds prepared by vacuum deposition in the form of solid films on quartz can crystallize when stored in the dark at room temperature. Similar experiments with impure aminoanthraquinone derivatives containing anthraquinone showed that whiskers² also grow from the surface of the film. When these substances were purified and freed from anthraquinone before deposition, however, no whiskers were formed when the solid films were stored; nor was it possible to grow whiskers from films containing only anthraquinone. Subsequent attempts to investigate whisker formation were made with films prepared from mixtures of the purified aminoanthraquinone compound and pure anthraquinone.