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  • Title: Inter- and intramolecular excited state proton transfer in 2-hydroxy-9H-carzole-1-carboxylic acid.
    Author: Nayak MK, Dogra SK.
    Journal: Spectrochim Acta A Mol Biomol Spectrosc; 2005 Apr; 61(6):1247-57. PubMed ID: 15741129.
    Abstract:
    Absorption, fluorescence and fluorescence excitation spectroscopy and single photon counting time dependence spectrofluorimetry have been used to study the inter- and intramolecular excited state proton transfer (ESIPT) reactions in 2-hydroxy-9H-carbazole-1-carboxylic acid (2-HCA). Except in cyclohexane and water (pH 5) dual fluorescence is observed in rest of the solvents used. Normal Stokes shifted band seems to originate from 2-HCA-1-c and tautomer emission band from the tautomer formed by ESIPT in 2-HCA-1-c followed by structural reorganization. Both these emission band systems originate from the same ground state species. AM1 and CNDO/S-CI calculations have been carried out to establish the identity of the species. Different prototropic equilibria have been determined and discussed.
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