Vapour pressure of some phthalocyanines

Mass spectrometric studies of the composition of the gaseous phase under so lid compounds of free phthalocyanine (H2Pc) and its complexes with aluminiu m (AICLPc, ALFPc, (AIPc)(2)O) and copper (CuPc) were performed in the tempe rature range up to 700 degrees C. It has been shown that the phthalocyanine s sublime in the form of monomers, excluding one aluminium complex. All pht halocyanines under investigation sublime without thermal decomposition unti l 700 degrees C. The vapour pressure of these phthalocyanines was determine d 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 mea sured. The thermodynamic parameters of the sublimation process for phthaloc yanies were calculated. Copyright (C) 2000 John Wiley & Sons, Ltd.