γ‐Cyclodextrin Derivatives Bearing Thymolphthalein Dyes in Their Secondary Hydroxyl Side as Guest‐Responsive Color Change Indicators |
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Authors: | Akio Yoshida Akihiko Ueno |
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Abstract: | Two geometrically isomeric γ‐cyclodextrin derivatives with a thymolphthalein moiety in the secondary hydroxyl side were prepared as guest‐responsive color change indicators. The isomers exhibit a pH dependence of their absorption spectra and a remarkable change in the absorbance around 610 nm upon guest addition. One of the isomers formed complexes of 2 : 1, the other of 1 : 1 stoichiometry (host/guest). |
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Keywords: | cyclodextrins dyes host‐guest systems inclusion chemistry sensors |
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