Supramolecular host-guest interactions of oxazine-1 dye with β- and γ-cyclodextrins: a photophysical and quantum chemical study.
作者： Mhejabeen Shaikh , Jyotirmayee Mohanty , Mahesh Sundararajan , Achikanath C. Bhasikuttan , Haridas Pal
DOI: 10.1021/JP3087368
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摘要: Supramolecular host–guest interactions of oxazine-1 dye with β- and γ-cyclodextrins (βCD γCD, respectively) have been investigated in neutral aqueous solution (pH ∼ 7) at ambient temperature (∼25 °C) following absorption, fluorescence, circular dichroism measurements. The forms inclusion complexes both CDs, causing significant changes its photophysical properties. Whereas fluorescence titration data for lower concentrations fit well 1:1 stoichiometric complexes, the time-resolved results indicate formation a small extent 1:2 (dye–host) as well, especially higher CD concentrations. moderate range binding constant values present systems indicates weaker hydrophobic interaction responsible complex these systems. It has also observed that γCD facilitates dimerization dye, prominently indicated On contrary, βCD always assists deaggregation th...
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