The Unusual Fluorescence Strengthened by Steric Hindrance

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  • Aimin Song
    Institute of Photographic Chemistry, Chinese Academy of Sciences
  • Tao Wu
    Institute of Photographic Chemistry, Chinese Academy of Sciences
  • Manhua Zhang
    Institute of Photographic Chemistry, Chinese Academy of Sciences
  • Tao Shen
    Institute of Photographic Chemistry, Chinese Academy of Sciences

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Abstract

<jats:title>Abstract</jats:title> <jats:p>In four dyads of fluorescein and carbazole, photoinduced intramolecular electron transfer occurred in polar solvents and was negligible in nonpolar solvents. However, unprecedented fluorescence strengthening in the dyad linked with a semi-rigid bridge (-CH2-Ph-CH2-) at the carboxyl of fluorescein (as 3.2 and 10 times as the model dibutyl derivative of fluorescein in toluene and cyclohexane, respectively) was observed. Experimental data showed it could result from steric hindrance.</jats:p>

Journal

  • Chemistry Letters

    Chemistry Letters 27 (9), 907-908, 1998-09-01

    Oxford University Press (OUP)

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