Twisted intramolecular charge transfer effects on fast violet B and fast blue RR: Effect of HP-α- and HP-β-cyclodextrins

► TICT is observed in FBRR and FVB with water and CD solutions. ► FBRR and FVB form 1:1 complex with HP-α-CD and HP-β-CD. ► Aniline ring present in the hydrophilic part and benzoyl ring present in the hydrophobic part of the CD nano-cavity ► Triexponential decay was observed in the nanosecond time-resolved fluorescence.