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IJC-A Vol.48A(11) [November 2009] >

Title: Inclusion complexation of 3,5-dihydroxybenzoic acid with β-cyclodextrin at different pHs
Authors: Siva, S
Sankaranarayanan, R K
Prabhu, A Antony Muthu
Subramanian, V K
Rajendiran, N
Keywords: Fluorescence spectra
Inclusion complexes
Intramolecular charge transfer
Issue Date: Nov-2009
Publisher: CSIR
Abstract: Effect of -cyclodextrin on the absorption and fluorescence spectra of 3,5-dihydroxy benzoic acid has been studied in buffer solutions of different pHs (1, 7, 10). The study reveals that in all the studied pHs, DHB forms 1:1 inclusion complex. The hydroxyl group is present in the interior part of the -CD cavity and carboxyl group is present in the hydrophilic part of the -CD cavity. Dual luminescence is observed in pH~1 and pH~7 solutions which shows that intramolecular charge transfer is present in these pHs. The broad spectral maximum at pH~10 indicates intramolecular proton transfer in DHB.
Page(s): 1515-1521
ISSN: 0975-0975(Online); 0376-4710(Print)
Source:IJC-A Vol.48A(11) [November 2009]

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