Spectroscopy and photoisomerization of protonated Schiff-base retinal derivatives in vacuo

Literature Information

Publication Date 2021-11-26
DOI 10.1039/D1CP04501F
Impact Factor 3.676
Authors

Anne P. Rasmussen, Elisabeth Gruber, Ricky Teiwes, Mordechai Sheves, Lars H. Andersen


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Abstract

The protonated Schiff-base retinal acts as the chromophore in bacteriorhodopsin as well as in rhodopsin. In both cases, photoexcitation initializes fast isomerization which eventually results in storage of chemical energy or signaling. The details of the photophysics for this important chromophore is still not fully understood. In this study, action-absorption spectra and photoisomerization dynamics of three retinal derivatives are measured in the gas phase and compared to that of the protonated Schiff-base retinal. The retinal derivatives include C9C10trans-locked, C13C14trans-locked and a retinal derivative without the β-ionone ring. The spectroscopy as well as the isomerization speed of the chromophores are altered significantly as a consequence of the steric constraints.

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