Electronic spectra of jet-cooled indoles:  evidence for the 1La state

Hager, James W.; Demmer, David; Wallace, Stephen C.

doi:10.1021/j100290a021

Cited by 89 publications

(81 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Indeed, the lifetime of the S1 excited state of serotonin has been reported to be ∼ 17 ns. 36,37 The indole S1 state is also able to undergo intersystem crossing to a triplet state, which has a lifetime of ∼ 7 s. 38 Although we have found that the Sero1C photoreactivation is relatively insensitive to the presence of oxygen (therefore, the S1 state of serotonin is the most likely electron donor to the pyrimidine dimer), the lifetime of the serotonin S1 state (∼ 17 ns) is vastly longer than that of the guanine S1 state (which has a very short lifetime of b 1 ps, at least within G-C base pairs). 39 The guanine S1 state, furthermore, is unable to cross over to a longer-lived triplet state.…”

Section: Discussionmentioning

confidence: 99%

A Deoxyribozyme, Sero1C, Uses Light and Serotonin to Repair Diverse Pyrimidine Dimers in DNA

Thorne

Chinnapen

Sekhon

et al. 2009

Journal of Molecular Biology

View full text Add to dashboard Cite

Section: Discussionmentioning

confidence: 99%

A Deoxyribozyme, Sero1C, Uses Light and Serotonin to Repair Diverse Pyrimidine Dimers in DNA

Thorne

Chinnapen

Sekhon

et al. 2009

Journal of Molecular Biology

View full text Add to dashboard Cite

“…4 At energies above ∼220 nm, strong absorption to two higher lying 1 ππ* states, denoted 1 B a and 1 B b , also becomes significant. [5][6][7] The region around the 1 L b origin (which lies at 283.8 nm) has been investigated extensively [8][9][10][11][12][13][14][15][16][17][18] and numerous vibronic bands are observed up to ∼271 nm. Since no individual vibronic progression exhibits more than two members, the geometries of the S 0 ground state and the 1 L b state are assumed to be similar.…”

Section: Introductionmentioning

confidence: 99%

Following the excited state relaxation dynamics of indole and 5-hydroxyindole using time-resolved photoelectron spectroscopy

Livingstone¹,

Schalk²,

Boguslavskiy³

et al. 2011

The Journal of Chemical Physics

View full text Add to dashboard Cite

Time-resolved photoelectron spectroscopy was used to obtain new information about the dynamics of electronic relaxation in gas-phase indole and 5-hydroxyindole following UV excitation with femtosecond laser pulses centred at 249 nm and 273 nm. Our analysis of the data was supported by ab initio calculations at the coupled cluster and complete-active-space self-consistent-field levels. The optically bright 1 L a and 1 L b electronic states of 1 ππ* character and spectroscopically dark and dissociative 1 πσ* states were all found to play a role in the overall relaxation process. In both molecules we conclude that the initially excited 1 L a state decays non-adiabatically on a sub 100 fs timescale via two competing pathways, populating either the subsequently long-lived 1 L b state or the 1 πσ* state localised along the N-H coordinate, which exhibits a lifetime on the order of 1 ps. In the case of 5-hydroxyindole, we conclude that the 1 πσ* state localised along the O-H coordinate plays little or no role in the relaxation dynamics at the two excitation wavelengths studied.

show abstract

“…( 1 L a state), see also Figure 2. For aromatic molecular systems such as indoles, [27][28][29][30][31][32][33] tryptophane, [34] or pyrene derivatives [35] internal conversion between these 1 L b and 1 L a levels has been suggested in the interpretations. For 1-naphthol [36,37] the 1 L b !…”

Section: Introductionmentioning

confidence: 99%

Solvent‐Dependent Photoacidity State of Pyranine Monitored by Transient Mid‐Infrared Spectroscopy

et al. 2005

View full text Add to dashboard Cite

We investigate with femtosecond mid‐infrared spectroscopy the vibrational‐mode characteristics of the electronic states involved in the excited‐state dynamics of pyranine (HPTS) that ultimately lead to efficient proton (deuteron) transfer in H2O (D2O). We also study the methoxy derivative of pyranine (MPTS), which is similar in electronic structure but does not have the photoacidity property. We compare the observed vibrational band patterns of MPTS and HPTS after electronic excitation in the solvents: deuterated dimethylsulfoxide, deuterated methanol and H2O/D2O, from which we conclude that for MPTS and HPTS photoacids the first excited singlet state appears to have charge‐transfer (CT) properties in water within our time resolution (150 fs), whereas in aprotic dimethylsulfoxide the photoacid appears to be in a nonpolar electronic excited state, and in methanol (less polar and less acidic than water) the behaviour is intermediate between these two extremes. For the fingerprint vibrations we do not observe dynamics on a time scale of a few picoseconds, and with our results obtained on the OH stretching vibration we argue that the dynamic behaviour observed in previous UV/Vis pump–probe studies is likely to be related to solvation dynamics.

show abstract

Electronic spectra of jet-cooled indoles: evidence for the 1La state

Cited by 89 publications

References 1 publication

A Deoxyribozyme, Sero1C, Uses Light and Serotonin to Repair Diverse Pyrimidine Dimers in DNA

A Deoxyribozyme, Sero1C, Uses Light and Serotonin to Repair Diverse Pyrimidine Dimers in DNA

Following the excited state relaxation dynamics of indole and 5-hydroxyindole using time-resolved photoelectron spectroscopy

Solvent‐Dependent Photoacidity State of Pyranine Monitored by Transient Mid‐Infrared Spectroscopy

Contact Info

Product

Resources

About