Spectral characterization of thin films of vanadyl hexadecafluorophthalocyanine VOPcF16

In this work, structural features and optical properties of hexadecafluorosubstituted vanadyl phthalocyanine (VOPcF16) films deposited by Organic Molecular Beam Deposition (OMBD) technique have been investigated. Thin films of VOPcF16 were characterised by ellipsometry, optical absorption and vibrational (IR and Raman) spectroscopy. VOPcF16 films deposited onto silicon and quartz substrates held at room temperature are well organized and characterised by a predominantly co-facial parallel arrangement of molecules vertical to the surface. Thermal treatment of these films at 220 degrees C leads to the transition from one phase to another and formation of the polycrystalline VOPcF16 films with randomly distributed crystallites on the substrate surface. (C) 2008 Elsevier B.V. All rights reserved

Vapour pressure of tetra-tert-butyl substituted phthalocyanines

In this work, the results of mass spectrometric studies of the composition of gaseous phase under solid compounds of tetra-tert-butyl substituted phthalocyanines MPc(t-Bu)(4), with M = Cu(II), VO are presented. The vapour pressure of this phthalocyanine is 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 is measured. It is shown that these tetra-tert-butyl-phthalocyanines exhibit higher volatility than their unsubstituted analogues. Such data are needed in order to improve the operating conditions of the growth of thin films by OMBD. The investigation of structural features of MPc(t-Bu)(4) films was carried out using UV-vis spectral and XRD data. (C) 2010 Elsevier B.V. All rights reserved

Volatile phthalocyanines: vapor pressure and thermodynamics

The current review summarizes the data of saturated vapor pressure and thermodynamic parameters of the sublimation process of different phthalocyanines as reported in the literature as well as in our work. The volatility of phthalocyanines is analyzed from the standpoint of their molecular and crystal structure. The differences in the saturated vapor pressure value of the investigated phthalocyanines may reach some orders of magnitude and are determined by the Van der Waals and electrostatic interaction of the peripheral atoms of adjacent molecules, as well as to a specific interaction, the type and number of which depend on the type of molecules packing in the crystal

Phthalocyanine films as active layers of optical sensors for pentachlorophenol detection

In this work, thin films of octasubstituted zinc phthalocyanine derivative (ZnPcR8) with bulky substituents R=-CH2N(SO2C6H5-CH3)CH2(CH2)(8)CH3 are investigated as active layers of optical sensors for the detection of pentachlorophenol. Using total internal reflection ellipsometry (TIRE) technique response characteristics of ZnPcR8 films to pentachlorophenol was studied in the concentration range 0.5-50 mu g/l. It was demonstrated that the specific binding of pentachlorophenol molecules causes substantial shift of Delta(lambda) spectrum. The minimum registered concentration of pentachlorophenol was 0.8 mu g/l. The results are supported by performing attenuated total reflection Fourier transform infrared (ATR-FTIR) difference spectroscopy. (C) 2009 Elsevier B.V. All rights reserved