Spectral Studies on the Cyclodextrin Inclusion Complexes of Toluidine Blue O and Meldola's Blue in Aqueous Solution |
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| Authors: | M Ilanchelian C Retna Raj R Ramaraj |
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| Institution: | (1) School of Chemistry, Madurai Kamaraj University, Madurai, 625 021, India |
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| Abstract: | The absorption and emission spectral properties of toluidine blue O (TBO) and Meldola's blue (MDB) in the presence of cyclodextrins (CDs) were studied. Formation of 1 : 1 and 1 : 2 (CD-Dye) inclusion complexes were observed with  -CD and  -CD, respectively. An increase in the emission intensity was noticed in the presence of -CD due to the formation of 1 : 1 (CD-Dye) inclusion complexes. However, a decrease in the emission intensity was observed in the presence of -CD due to the formation of 1 : 2 (CD-Dye) inclusion complexes. Dimerization of dye molecules in the presence of -CD lead to a decrease in the emission intensity. The formation constants for the 1 : 1 and 1 : 2 (CD-Dye) inclusion complexes were calculated. |
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| Keywords: | Toluidine blue O Meldola's blue cyclodextrin inclusion complex |
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