Journal of Photoscience

Korean Society of Photoscience (한국광과학회)
권호 표지

INVESTIGATION OF TRIPLET STATE AND SINGLET OXYGEN DYNAMICS OF BENZOPHENONE IN POLAR AND NONPOLAR SOLUTIONS WITH TIME-RESOLVED TWO-COLOR THERMAL LENSING METHOD

  • Ha, Jeong-Hyon (Department of Chemistry, Yonsei University, Seoul 120-749, Korea)
  • Published : 1996.09.01
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Abstract

The heat generated by nonradiative decay dynamics induces thermal lens effect. From such an effect, photodynamic properties of solutions can be investigated with two-color pulsed thermal lens experiments which have the time resolution of down to nanoseconds. In this study, using nanosecond two-color thermal lens method, we investigated the triplet state of benzophenone and the singlet oxygen state dynamics in various oxygen concentration solvents. The measured triplet state lifetimes, singlet oxygen relaxation times and singlet oxygen formation quantum yields are in good agreement with the reference values. From these parameters the existence of the triplet exciplex formation between benzophenone and benzene is proved, and it is also suggested that the relaxations of triplet states of benzophenone undergo coupled dynamics with some of singlet oxygens in oxygen-rich conditions.

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References

  1. Topics in Current Physics Bailey, R. J.;F. R. Cruickshank;P. Hess(ed.)
  2. Topics in Current Physics Hess, P.;P. Hess(ed.)
  3. J. Am. Chem. Soc. v.105 Thermal lensing study of singlet oxygen reactions. Fuke, K.;M. Ueda;M. Itoh
  4. Chom. Rev. v.92 Time-resolved photothermal and photoacoustic methods appleid to photoinduced processes in solution. Braslavsky, S. E.;G. E. Heibel
  5. J. Phys. Chem. v.95 Phototheumal investigation of the triplet state of $C_{60}$ Terazima, M.;N. Hirota;H. Shinohara;Y. Saito
  6. Chem. Soc. Rov. Photosensitizers of the porphyrin and phthalocyanine series for photodynamic therapy. Bonnett, R.
  7. Photochem. Photobiol. v.45 Thermal-lensing and phosphorescence studies of the quantum yield and lifetime of singlet molecular oxygen ($\Delta_{g}$) sensitized by hematoporphyrin and related porphyrins in deuterated and non-deuterated ethanols. Redmond, R. W.;K. Heihoff, S. E.;Braslavsky;T. George
  8. Chem. Phys. Lett. v.141 Measurement of the triplet lifetime and the quantum yield of triplet formation of phthalazine bu the time-resolved thermal lens method. Terazima, M.;T. Azumi
  9. Photochem. Photobio. v.54 Is singlet oxygen formation dominat in triplet quenching processes? Measurement of the quantum yield of singlet oxygen ofrmation by the time-resolved thermal lens method. Terazima, M.;M. Tonooka;T. Azumi
  10. J. Photochem. v.31 Thermal-lensing measurements of singlet molecular oxygen ($\Dalta_{g}$): quantum yields of formation and lirdtimes. Rossbroich, G.;N. A. Garcia;S. E. Braslavsky
  11. Bull. Chem. Soc. Jpn. v.65 Photodissociation of highly-excited triplet state of benzophenone studied by a time-resolved thermal lensing thchnique. Kajii, Y.;T. Suzuki, Y.;Takatori, K. Shibuya;K. Obi
  12. J. Am. Chem. Soc. v.111 Resolution of benzophenone delayed fluorescence and phosphorescence sprctra. Evidence of vibrationally unrelaxed prompt benzophenone fluorescence. Sun, Y. P.;D. F. Sears;J. Saltiel
  13. Proceeding of the 50th anneversary conference of the Korean chemical Society Molecular coupling dynamics with time-resolved photothermal properties. Ha J. H.;Y. R. Kim
  14. J. Am. Chem. Soc. v.94 Radiationless decay of singlet molecular oxygen in solution, An experimental and theoretical study of electronic-to-vibrational energy transfer. Merkel, P. B.;D. R. Kearns
  15. J. Am. Chem. Soc. v.98 Quenching of aromatic hydrocarbon singlets and aryl ketone triplets by alkyl disulgides. Wallace, W. L.;R. P. V. Duyne;F. D. Lewis
  16. J. Am. Chem. Soc. v.105 Solvent-induced deactivation of singlet oxygen : Additivity relationships in nonaromatic solvents. Rodgers, M. A. T.
  17. Chem. Phys. v.161 Relaxation processes of highly excited naphthalene in solution studied by time-resolxed thermal lensing technique. suzuki, T.;Y. Kajii;K. Shibuya;K. Obi
  18. Solubilities of inorganic and metal organic compounds, 3rd ed. Seidell, A.
  19. Zehlnwerte nud Funktionen, Band Ⅱ, Teil 5 Bomstein, L.
  20. Biophysical ChemistryⅡ Cantor, C. R.;P. R. Schimmel
  21. J. Am. Chem. Soc. v.99 Deactivation of benzophenone triplets via exciplex formation. Evidence fof dual reaction pathways. Wolf, M. W.;R. E. Brown;L. A. Singer