Excited State Proton Transfer Dynamics of Thioacetamide in S2(ππ*) State: Resonance Raman Spectroscopic and Quantum Mechanical Calculations Study

2015 ◽  
Vol 119 (5) ◽  
pp. 832-842 ◽  
Author(s):  
Xiao Chen ◽  
Yanying Zhao ◽  
Haibo Zhang ◽  
Jiadan Xue ◽  
Xuming Zheng
Keyword(s):  
Excited State ◽  
Proton Transfer ◽  
Resonance Raman ◽  
Quantum Mechanical ◽  
Quantum Mechanical Calculations ◽  
Raman Spectroscopic ◽  
State Resonance ◽  
Excited State Proton Transfer

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.

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