Proton transfer involving a photoacid in Langmuir–Blodgett films of octadecylamine by time-resolved fluorescence spectroscopy

Proton transfer in organized assembly has been investigated by steady-state and picosecond time-resolved fluorescence spectroscopy. Pyranine has been incorporated into the functionalized Langmuir–Blodgett (LB) films of octadecylamine. This paper is the first example of investigating proton transfer involving pyranine in the restricted geometry of functionalized LB films. Time-resolved fluorescence spectra of pyranine in LB film matrices show that as deprotonation occurs the PyOH* band decays and the PyO−* band builds up. It is observed that the proton transfer reactions in restricted geometry can be monitored by choosing proper parameters.