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Abstract
A small absorption of light has been observed in the visible region of spectrum in oleic acid, whereas a strong increase in the absorption has been observed in the near the ultraviolet region. The increase in absorption in the visible region after the application of pressure has been observed using an apparatus constructed in the Faculty laboratory. A small amount of rhodamine 6G (C28H31N2O3Cl) was added to some amount of oleic acid (C18H34O2) and the examination of the mixture showed the reshaping of the absorption chart as a function of light wavelength. Pressure-induced changes of the VIS absorption spectrum in the mixture of rhodamine 6G and oleic acid have been observed compared with those of the absorption spectrum of the mixture of rhodamine 6G in ethanol. The analysis of the absorption bands of mixtures rhodamine 6G in ethanol and rhodamine 6G in oleic acid has been approximated with the sum of Gaussian curves. The analyses of these absorption charts have shown that probably VIS absorption of the mixture of rhodamine 6G in oleic acid is probably a result of imposition of the absorption spectrum of rhodamine 6G and that charge transfer complexes are formed.