Effect of Pressure on Cyanine Spectra

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Abstract
The effect of high pressure has been measured on the electronic spectra of a number of cyanine dyes dissolved in cellulose acetate. In general, a red shift was observed with pressure, which varied in magnitude with the chain length and electronegativity of the end group. The results are discussed in terms of Olszewski's resonance barrier model. The peaks tended to broaden with increasing pressure, and to decrease in height. There was no significant change in the total area under the peak. For a few cyanines the spectra of the crystals were also measured to study the effect of pressure on the Davydoff splitting. The degree of splitting increased with increasing pressure as was to be expected. There was a redistribution of intensity among the different branches with increasing splitting.

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