NDLI: Mechanism for Highly Efficient Non-Radiative Deactivation of Electronic Excitation in Rutin

Content Provider	Springer Nature Link
Author	Bondarev, S. L. Knyukshto, V. N. Tikhomirov, S. A. Bugav, O. V.
Copyright Year	2016
Abstract	Steady-state and pulsed spectroscopic methods are used to study the spectroscopic and photophysical properties of the biologically important plant pigment rutin at room temperature and 77 K in organic solvents and a buffer solution at pH 7.0. The large dipole moment μ$_{e}$ = 13.3 D of the rutin molecule in a Franck–Condon excited state indicates that rutin is dipolar in this excited state. The nonstationary S$_{1}$ → Sn induced absorption spectra are characterized by a short-wavelength band at λ$_{abs}$ $^{max}$ = 460 nm and low-intensity absorption in the 500–750 range which clearly belongs to associates of rutin. No residual induced absorption which might be related to triplet-triplet T$_{1}$→T$_{k}$ transitions in rutin was observed over the entire spectral range for times >50 ns. S$_{1}$ → S$_{0}$ fluorescence with a quantum yield Φ$_{fl}$ ~ 10$^{–4}$ was also observed at room temperature. The fluorescence and fluorescence excitation spectra manifest a weak dependence on the excitation and detection wavelengths, which may be related to the presence of conformers in the solution owing to rotation of the phenol B ring around a single 1′–2 bond. Lowering the temperature of a glassy frozen solution of rutin in ethanol to 77 K raises Φ$_{fl}$ by a factor of 750. A rate constant k$_{ic}$ = 3.7·1011 s$^{–1}$ for internal conversion from the S$_{1}$ state at room temperature is calculated from the spectral-luminescence data. It is found that the main channel for exchange of electronic excitation energy in the rutin molecule at room temperature is S$_{1}$(π,π$^{*}$) ~~> S$_{0}$-internal conversion induced by the charge-transfer state.
Starting Page	929
Ending Page	935
Page Count	7
File Format	PDF
ISSN	00219037
Journal	Journal of Applied Spectroscopy
Volume Number	82
Issue Number	6
e-ISSN	15738647
Language	English
Publisher	Springer US
Publisher Date	2016-01-18
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	spectroscopy photophysics flavonoids fluorescence phosphorescence photoprotectors non-radiative processes Atomic/Molecular Structure and Spectra Analytical Chemistry
Content Type	Text
Resource Type	Article
Subject	Spectroscopy Condensed Matter Physics

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