Normal and twisted intramolecular charge transfer (TICT)‎ fluorescence of p-(n, n-diphenylamino)‎ benzoic acid methyl ester (DPABME)‎ in various solvents

Abstract EN

The steady state fluorescence of P-(N, N-diphenylamine) benzoic acid methyl ester (DPABME) in ethanol is broad and is composed mainly of the intermolecular charge transfer (ICT) band ~490 nm and a shoulder ~400 nm due to normal fluorescence of charge transfer character.

In acetonitrile only the long fluorescence (ICT) band ~480 nm could be observed.

In n-butyl chloride, only the short fluorescence ~420 nm could be observed.

The competition between the two fluorescence bands is discussed and confirmed by fluorescence decay, time resolved fluorescence (TRF) spectra and red edge effect (REE) results.