Vapor pressure measurements and thermodynamics of some volatile phthalocyanines

Mass spectrometric studies of the composition of the gaseous phase for solid compounds of hexadecafluorinated phthalocyanines MPcF16, M = Cu, Zn, VO and their unsubstituted MPc analogs were performed in a temperature range up to 600 degrees C. It has been shown that phthalocyanines sublime into the form of monomers without thermal decomposition. The vapor pressure of these phthalocyanines was determined as a function of temperature by the Knudsen effusion method, in which the rate of effusion of the equilibrium vapor through a small orifice was measured. The thermodynamic parameters of the sublimation process for phthalocyanines were calculated. Copyright (c) 2006 Society of Porphyrins & Phthalocyanines.