γ-Cyclodextrin Derivatives Bearing Thymolphthalein Dyes in Their Secondary Hydroxyl Side as Guest-Responsive Color Change Indicators

A facile method to construct dual-responsive organogels with color changes

“…Thymolphthalein having an isopropyl and a methyl group in each of the two phenol rings, is too big to be included into the cavity. 12 This will result in two b-CD molecules including one thymolphthalein molecule in a face-to-face mode through hydrogen bonds between the two host molecules in order to realize the inclusion.…”