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| Content Provider | PubMed Central |
|---|---|
| Author | Cohen, Boiko Larson, Matthew H. Kohler, Bern |
| Abstract | The excited-state dynamics of the RNA homopolymer of cytosine and of the 18-mer (dC)18 were studied by steady-state and time-resolved absorption and emission spectroscopy. At pH 6.8, excitation of poly(rC) by a femtosecond UV pump pulse produces excited states that decay up to one order of magnitude more slowly than the excited states formed in the mononucleotide cytidine 5’-monophosphate under the same conditions. Even slower relaxation is observed for the hemiprotonated, self-associated form of poly(rC), which is stable at acidic pH. Transient absorption and time-resolved fluorescence signals for (dC)18 at pH 6.8 are similar to ones observed for poly(rC) near pH 4, indicating that hemiprotonated structures are found in DNA C tracts at neutral pH. In both systems, there is evidence for two kinds of emitting states with lifetimes of ~100 ps and slightly more than 1 ns. The former states are responsible for the bulk of emission from the hemiprotonated structures. Evidence suggests that slow electronic relaxation in these self-complexes is the result of vertical base stacking. The similar signals from RNA and DNA C tracts suggest a common base-stacked structure, which may be identical with that of i-motif DNA. |
| Related Links | http://dx.doi.org/10.1016/j.chemphys.2008.01.050 |
| Ending Page | 174 |
| Page Count | 10 |
| Starting Page | 165 |
| File Format | |
| ISSN | 03010104 |
| Journal | Chemical physics |
| Issue Number | 1-3 |
| Volume Number | 350 |
| Language | English |
| Publisher Date | 2008-06-01 |
| Access Restriction | Open |
| Subject Keyword | Physical and Theoretical Chemistry Physics and Astronomy(all) Research in Higher Education |
| Content Type | Text |
| Resource Type | Article |
| Subject | Physics and Astronomy Physical and Theoretical Chemistry |
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