Abstract
Abstract The inclusion behavior of cyclodextrins (CDs) towards neutral species of benzo[h]quinoline (BhQ), benzo[f]quinoline (BfQ), and phenanthridine (PT) have been investigated in pH 7.3 buffers. α-CD forms little or no inclusion complexes with BhQ, BfQ, and PT, whereas β-CD forms 1:1 inclusion complexes with these benzoquinolines. In β-CD solution containing propylene oxide or tetrahydrofuran, a ternary inclusion complex is formed among β-CD, the benzoquinoline, and propylene oxide (tetrahydrofuran). γ-CD forms 1:1 inclusion complexes with the benzoquinolines, except for BhQ, for which a precipitation has been observed in the concentration range examined. For BfQ, its excimer fluorescence has also been observed, which is due to the 2:2 γ-CD–BfQ inclusion complex. The equilibrium constants for the formation of the binary and ternary inclusion complexes have been evaluated from the fluorescence intensity changes.
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