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Indian Journal of Chemistry -Section A (IJC-A) >
IJC-A Vol.48A [2009] >
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
Luminescence
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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