Issue 34, 2021

Ultrafast vibrational wave packet dynamics of the aqueous tyrosyl radical anion induced by photodetachment

Abstract

The ultrafast dynamics triggered by the photodetachment of the tyrosinate dianion in aqueous environment shed light on the elementary processes that accompany the interaction of ionizing radiation with biological matter. Photodetachment of the tryosinate dianion yields the tyrosyl radical anion, an important intermediate in biological redox reactions, although the study of its ultrafast dynamics is limited. Here, we utilize femtosecond optical pump–probe spectroscopy to investigate the ultrafast structural reorganization dynamics that follow the photodetachment of the tyrosinate dianion in aqueous solution. Photodetachment of the tyrosinate dianion leads to vibrational wave packet motion along seven vibrational modes that are coupled to the photodetachment process. The vibrational modes are assigned with the aid of density functional theory (DFT) calculations. Our results offer a glimpse of the elementary dynamics of ionized biomolecules and suggest the possibility of extending this approach to investigate the ionization-induced structural rearrangement of other aromatic amino acids and larger biomolecules.

Graphical abstract: Ultrafast vibrational wave packet dynamics of the aqueous tyrosyl radical anion induced by photodetachment

Associated articles

Supplementary files

Article information

Article type
Paper
Submitted
01 juil. 2021
Accepted
15 août 2021
First published
16 août 2021

Phys. Chem. Chem. Phys., 2021,23, 18525-18534

Ultrafast vibrational wave packet dynamics of the aqueous tyrosyl radical anion induced by photodetachment

M. S. Bin Mohd Yusof, Y. L. Lim and Z. Loh, Phys. Chem. Chem. Phys., 2021, 23, 18525 DOI: 10.1039/D1CP02975D

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