In the course of investigating the thermal properties of copper phthalocyanine and related materials, a sample of copper phthalocyanine was quickly heated to 900°in a sealed evacuated Vycor ampule with no visible change in its properties. A second sample maintained at 800°for one hour was also apparently unchanged and its infrared spectrum was identical to unheated material from the same preparation. Although it has been long known that copper phthalocyanine can be sublimed at atmospheric pressure at 580°,3 this unusually

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