Vapour pressure of some phthalocyanines

Mass spectrometric studies of the composition of the gaseous phase under solid compounds of free phthalocyanine (H2Pc) and its complexes with aluminium (AICLPc, ALFPc, (AIPc)(2)O) and copper (CuPc) were performed in the temperature range up to 700 degrees C. It has been shown that the phthalocyanines sublime in the form of monomers, excluding one aluminium complex. All phthalocyanines under investigation sublime without thermal decomposition until 700 degrees C. The vapour 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 vapour through a small orifice was measured. The thermodynamic parameters of the sublimation process for phthalocyanies were calculated. Copyright (C) 2000 John Wiley & Sons, Ltd.