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 μe = 13.3 D of the rutin molecule in a Franck–Condon excited state indicates that rutin is dipolar in this excited state. The nonstationary S1 → Sn induced absorption spectra are characterized by a short-wavelength band at λabs 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 T1→Tk transitions in rutin was observed over the entire spectral range for times >50 ns. S1 → S0 fluorescence with a quantum yield Φfl ~ 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 Φfl by a factor of 750. A rate constant kic = 3.7·1011 s–1 for internal conversion from the S1 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 S1(π,π*) ~~> S0-internal conversion induced by the charge-transfer state.
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Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 82, No. 6, pp. 852–859, November–December, 2015.
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Bondarev, S.L., Knyukshto, V.N., Tikhomirov, S.A. et al. Mechanism for Highly Efficient Non-Radiative Deactivation of Electronic Excitation in Rutin. J Appl Spectrosc 82, 929–935 (2016). https://doi.org/10.1007/s10812-016-0207-3
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DOI: https://doi.org/10.1007/s10812-016-0207-3