The absorption spectra of the Cu(II) beta - diketonates vapours in the 115 - 300 nm region
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Date
1994
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Publisher
Ohio State University
Abstract
The 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.
Description
Author Institution: Institute of Inorganic Chemistry of the Siberian Division of the Russian Academy sciences