Empirical Dielectric Constant From Optical Measurements
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Solvent effects on the vibrational and electronic absorption band of different compoundsrnwere determined. In increasing the polarity of the solvent a shift of the absorptionrnmaxima to lower energy was observed in all compounds. The solvation dielectricrnconstant of dioxane was empirically determined from correlation plot of Lippert-Matagarnpolarity function versus vibrational absorption maxima of picolinamide and other amidesrn(Acrylamide, propylamide etc.). From linear fit the value of solvation dielectric constantrnof dioxane was goes to infinite (ï¥r,solv= ï‚¥ ), which is unrealistic and unphysical. Inrnaddition, from correlation plot of Lippert-Mataga polarity function versus electronicrnabsorption maxima of DMABA, BBA and NBA the value of solvation dielectric constantrnof dioxane was found to be 3.4, 3.8 and 7.7, respectively. These values were inconsistentrnand there is no universal solvation dielectric constant from electronic spectroscopy
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