Twisted Intramolecular Charge Transfer of 2-(4‘-N,N-Dimethylaminophenyl)pyrido[3,4-d]imidazole in Cyclodextrins: Effect of pH

摘要: Absorption, fluorescence, and fluorescence excitation spectra of 2-(4‘-N,N-dimethylaminophenyl)pyrido[3,4-d]imidazole (DMAPPI) have been studied as a function cyclodextrins (CDxs) acid concentrations. The above study has revealed that −NMe2 group enters into the CDx cavity pyridoimidazole (PI) ring is present at interface. N3− atom >NH PI are involved in hydrogen bonding with water molecule interface and/or hydroxyl groups CDxs, N6− bulk water. Two monocations (MC1 MC3) S0 state, MC2 MC3 S1 state. emission observed when MC1 excited to state involves biporotonic phototautomerism, whereas for not from locally but twisted intramolecular charge transfer (TICT) Fluorescence band maxima all bands blue shifted their ...