The absorption spectra of the Cu(II) beta - diketonates vapours in the 115 - 300 nm region

Author Institution: Institute of Inorganic Chemistry of the Siberian Division of the Russian Academy sciencesThe high temperature vapour absorption spectra of Cu(gfac)2 Cu(dpm)2 (gfac, dpm - 1,1,1,5,5,5--hexafluoro-2,4- pentanedionate, 2,2,6,6-tetramethyl-3,5-heptanedicnate anions, respectively) have been measured on Seya-Namioka type spectrophotometer with a resolution of 5 A in the 115-300 nm region. The hydrogen lamp was used as a radiation source. The heated and vacuum-tight quartz cell with MgF2 windows were used. The concentration of Cu(II) beta-diketonates was calculated from saturated vapour pressure data. The absorption cross section of Cu(II) beta-diketonates vapours were calculated. It was shown the obtained values correspond to the known extinction coefficients in the 220-300 nm region of these compounds dissolved in nonpolar solvents. The intense absorption bands in the wavelength region of 140-170 nm were determined. Using the known molecular orbital calculations for Cu(dpm)2 the absorption bands observed about 150, 210, 250 nm can be interpreted as the metal to ligand charge- transfer e-transition and the absorption bands observed about 170, 300 nm - as the ligand e-transition bands. The obtained spectral data of these compounds were used for an aiming choose of the wavelength for the photochemical vapour deposition of metal films

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

MO CVD obtaining composite coatings from metal of platinum group on titanium electrodes

In the present paper we report obtaining composite coatings based on platinum metals by means of CVD technique. Platinum-, iridium- and ruthenium-containing coatings were deposited onto titanium substrates. Platinum bis-(2,4-pentanedionate), iridium tris-(2,4-pentanedionate), and ruthenium tris-(2,4-pentanedionate) were used as precursors. Corrosion resistance of the obtained samples is investigated with respect to the deposition conditions (substrate temperature and flow rate of the gas reagent – oxygen). Investigation was carried out using the electrolysis in sea water simulated solutions under active evolution of oxygen. It is stated that platinum coatings exhibit longer mean lifetime, in comparison with iridium and ruthenium samples. Service lifetime of the best electrodes exceeded 600 hours