Time-resolved resonance Raman scattering of the excited singlet state of 2-(2′-hydroxyphenyl)benzoxazole after excited state intramolecular proton transfer

2005 ◽  
Vol 415 (1-3) ◽  
pp. 121-125 ◽  
Author(s):  
V. Kozich ◽  
J. Dreyer ◽  
A. Vodchits ◽  
W. Werncke
Keyword(s):  
Excited State ◽  
Raman Scattering ◽  
Proton Transfer ◽  
Singlet State ◽  
Resonance Raman ◽  
Intramolecular Proton Transfer ◽  
Excited Singlet State ◽  
Resonance Raman Scattering ◽  
Excited Singlet ◽  
Time Resolved

Ab initio insights into the mechanism of excited-state intramolecular proton transfer triggered by the second excited singlet state of a fluorescent dye: an anti-Kasha behavior

2019 ◽  
Vol 3 (6) ◽  
pp. 1225-1230 ◽  
Author(s):  
Huijuan Yuan ◽  
Xugeng Guo ◽  
Jinglai Zhang
Keyword(s):  
Excited State ◽  
Proton Transfer ◽  
Ab Initio ◽  
Singlet State ◽  
Intramolecular Proton Transfer ◽  
Fluorescent Dye ◽  
Excited Singlet State ◽  
Excited Singlet ◽  
Ultrafast Process

An excited-state intramolecular proton transfer (ESIPT) reaction triggered by the second excited singlet S2 state is found by ab initio calculations to be an ultrafast process for a novel fluorophore.

Infrared absorption and resonance Raman scattering of photochromic triphenylformazans

1983 ◽  
Vol 61 (5) ◽  
pp. 809-816 ◽  
Author(s):  
J. W. Lewis ◽  
C. Sandorfy
Keyword(s):  
Excited State ◽  
Raman Scattering ◽  
Proton Transfer ◽  
Raman Spectra ◽  
Infrared Absorption ◽  
Resonance Raman ◽  
Tautomeric Equilibrium ◽  
Resonance Raman Scattering ◽  
Excited State Proton Transfer ◽  
Resonance Raman Spectra

The infrared and resonance Raman spectra of the two long-lived forms of triphenylformazan and several of its derivatives have been examined. The spectra of unsymmetrically 15N-labelled derivatives suggest that two tautomers exist for each of the two forms. This observation is confirmed by the spectra of 1-(p-halophenyl)-3,5-diphenylformazans. The spectra of the non-chelate forms of these latter compounds demonstrate that the position of the tautomeric equilibrium is influenced by the electron-attracting ability of the para-halo-substituent. A comparison of the resonance Raman spectra of the two forms leads to the conclusion that excited state proton transfer is the initial photoevent in the photochromism of the triphenylformazans.

scholarly journals Picosecond Time-Resolved Fourier Transform Raman Spectroscopy of 9,10-Diphenylanthracene in the Excited Singlet State

1995 ◽  
Vol 49 (5) ◽  
pp. 645-649 ◽  
Author(s):  
Gouri S. Jas ◽  
Chaozhi Wan ◽  
Carey K. Johnson
Keyword(s):  
Raman Spectroscopy ◽  
Fourier Transform ◽  
Excited State ◽  
Near Infrared ◽  
Singlet State ◽  
Excited Singlet State ◽  
Excited Singlet ◽  
Time Resolved ◽  
Fourier Transform Raman Spectroscopy ◽  
Fourier Transform Raman

Time-resolved Fourier transform Raman spectroscopy of the highly fluorescent chromophore 9,10-diphenylanthracene (DPA) in cyclohexane and ethanol is described. Raman spectra of the first excited singlet state of DPA were obtained with 100-ps resolution at several time delays between pump pulses at 355 nm and probe pulses at 1064 nm. The near-infrared excited-state Raman scattering is enhanced by resonance with an excited-state transition of DPA. The excited-state Raman bands decay in about 5–6 ns. Evidence for interaction of the solvent with the DPA excited state is observed in the cyclohexane C-H stretching bands.

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