Acid–base regulated inclusion complexes of β-cyclodextrin with 1-[2-(4-fluorophenyl)-2-oxoethyl]-4,4′-bipyridinium dichloride displaying multistimuli-responsive chromic behaviors and photomodulable fluorescence

Two inclusion complexes of β-cyclodextrin with a viologen derivative display multistimuli-responsive chromic behaviors and photomodulable fluorescence, which endows them with various applications.