Abstract
Spectral characteristics of 2-(4′- N, N-dimethylaminophenyl)pyrido[3,4-d]imidazole (DMAPPI) have been studied in AOT/ n-heptane/water reverse micelles at w 0≥0. Absorption, fluorescence excitation and fluorescence spectra have revealed that the monocation (MC) of DMAPPI, protonated at the imidazole nitrogen (MC2) ( Scheme 2) is present in the S 0 state at w 0=0, along with the MC, protonated at pyridine nitrogen (MC3) and only normal emission is observed from both MC2 and MC3. With increase in w 0 (water amount), the equilibrium is shifted towards the MC, protonated at NMe 2 group (MC1) and MC3 in the S 0 state. Biprotonic phototautomerism is observed in MC1 to generate MC2 in the S 1 state. The twisted intramolecular charge transfer (TICT) emission replaces the normal emission in MC3. All the MCs are present near the anionic polar head group of AOT in the bound water region.
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