Imaging Science and Photochemistry ›› 2018, Vol. 36 ›› Issue (4): 299-305.DOI: 10.7517/j.issn.1674-0475.171201

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Study on Fluorescence Spectral Behavior of 1,5-Diphenyl-3-biphenylyl-2-pyrazoline

LI Junfen1, LI Pengxia1, ZHANG Lin1, DONG Chuan2   

  1. 1. Department of Chemistry and Chemical Engineering, Shanxi University, Taiyuan 030006, Shanxi, P. R. China;
    2. Institute of Enviromental Science, Shanxi University, Taiyuan 030006, Shanxi, P. R. China
  • Received:2017-12-09 Revised:2018-01-09 Online:2018-07-15 Published:2018-07-15

Abstract: The pyrazoline derivatives have excellent hole-transfer performance and luminescent properties. In this paper, the spectral behaviors of 1,5-diphenyl-3-biphenylyl-2-pyrazoline (DBP) were investigated by fluorescence spectroscopy briefly. DBP has strong fluorescence emission, and its spectral behaviors were significantly affected by solvent polarity and acidity. With the increase of solvent polarity, the fluorescence emission of DBP showed a remarkably red shift, and the difference of dipole moments between the excited state and the ground state increased due to intramolecular charge transfer. Under strong acidic conditions, the fluorescence of DBP was significantly quenched and quantum yield reduced. In addition, the fluorescence of DBP were effectively quenched by acceptors of fluorenone and trinitrofluorenone, because of strong intermolecular photoinduced charge transfer. The charge transfer between DBP and trinitrofluorenone was obviously stronger than fluorenone. Further experiment shows that the fluorescence quenching of DBP by fluorenone or trinitrofluorenone was dynamic quenching process.

Key words: pyrazoline, fluorescence, spectral behavior, dynamic quenching process