Ultrafast time-resolved spectroscopy of diarylethene-based photoswitchable deoxyuridine nucleosides
Photoswitches based on the diarylethene architecture have been attracting considerable attention for the investigation and control of a variety of biological processes. The reversible photoisomerization reaction between their open- and closed-ring forms can be selectively addressed by irradiation wi...
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| Main Authors: | , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
November 10, 2015
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| In: |
The journal of physical chemistry letters
Year: 2015, Volume: 6, Issue: 23, Pages: 4717-4721 |
| ISSN: | 1948-7185 |
| DOI: | 10.1021/acs.jpclett.5b01949 |
| Online Access: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1021/acs.jpclett.5b01949
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| Author Notes: | Tiago Buckup, Christopher Sarter, Hans-Robert Volpp, Andres Jäschke, Marcus Motzkus |
MARC
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| 520 | |a Photoswitches based on the diarylethene architecture have been attracting considerable attention for the investigation and control of a variety of biological processes. The reversible photoisomerization reaction between their open- and closed-ring forms can be selectively addressed by irradiation with light of two markedly different wavelengths. In this work, the dynamics of the photochromic ring-opening reaction of four novel diarylethene-based photoswitchable deoxyuridine nucleosides is investigated by femtosecond transient absorption. Upon photoexcitation with sub-20 fs pulses in the first absorption band (500 nm), all four photoswitches showed a fast ballistic excited-state deactivation within less than 500 fs toward the S1/S0 conical intersection. Transient data was globally analyzed, and a relaxation kinetic model with a branching between open and closed ring forms without any loss channels was derived. Ring-opening quantum yields, Φr-o, were found to strongly depend on the substituents (R), ranging from 0.64 (dUPSI: R = 2-naphthyl) to 0.30 (dUPSIV: R = 2-pyridyl). | ||
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