Abstract
The vibrational spectra of the protonated Schiff base of n-butylretinal (nSBR(+)) in dichloromethane are studied. The trifluoroacetic acid (TFA) is used for the protonation of the Schiff base of n-butylretinal (nSBR). Combining the two-dimensional correlation analysis of the experimental infrared spectra with anharmonic frequency calculations it is shown that two types of ionic aggregates between nSBR(+) and the TFA counterion are formed. The study suggests that the interaction between nSBR(+) and the TFA counterion may be responsible for the observed lost of photoselectivity in the trans-cis isomerization of the nSBR(+) in solution.
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