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Ultrafast intersystem crossing of 4-Thiothymidine inaqueous solution

Harada, Yosuke; Okabe, Chie; Kobayashi, Takashi; Suzuki, Tadashi; Ichimura, Teijiro; Nishi, Nobuyuki and Xu, Yao-Zhong (2010). Ultrafast intersystem crossing of 4-Thiothymidine inaqueous solution. Journal of Physical Chemistry Letters, 1(2) pp. 480–484.

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DOI (Digital Object Identifier) Link: http://dx.doi.org/10.1021/jz900276x
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Abstract

Ultrafast intersystem crossing of UVA-sensitive 4-thiothymidine in aqueous solution was investigated by pump?probe transient absorption. 4-Thiothymidine in the excited singlet state exhibited a distinctively different photophysical pathway from that of thymidine, with intersystem crossing to the triplet manifold being dominant and the triplet formation being completed within approximately 10 ps. This was further supported by quantum chemical calculations. We propose that the unique behavior of photoexcited 4-thiothymidine results from its distinctive molecular and electronic structures and that the triplet form is the initial toxic source to DNA and other biomolecules.

Item Type: Journal Article
Copyright Holders: 2010 American Chemical Society
ISSN: 0022-3654
Academic Unit/Department: Science > Life, Health and Chemical Sciences
Interdisciplinary Research Centre: Biomedical Research Network (BRN)
Item ID: 19898
Depositing User: Astrid Peterkin
Date Deposited: 09 Feb 2010 12:19
Last Modified: 13 Mar 2014 03:14
URI: http://oro.open.ac.uk/id/eprint/19898
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