Abstract
Fluorescence lifetimes fluorescence quantum yields and triplet yields were measured for fluorenone in various hydroxylic and non-hydroxylic solvents, and inβ-cyclodextrin complexes. The rate of singlet-triplet intersystem crossing, which decreases with increasing polarity, was found to be a good indicator of nonspecific solvent-solute interactions, while the rate of direct internal conversion from the singlet excited state was correlated with hydrogen bonding. The fast internal conversion of singlet excited fluorenone/β-cyclodextrin complexes shows that the probe molecule, while embedded within the cyclodextrin cavity, still remains hydrogen bonded.
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Biczók, L., Jicsinszky, L. & Linschitz, H. Solvent-dependent radiationless transitions in fluorenone: A probe for hydrogen bonding interactions in the cyclodextrin cavity. J Incl Phenom Macrocycl Chem 18, 237–245 (1994). https://doi.org/10.1007/BF00708730
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DOI: https://doi.org/10.1007/BF00708730