Excited from aminopyrenes

While HAN shows an ESIPT reaction between two groups both located on the molecular frame of the dye and does not need solvation for the occurrence of internal proton motion, 1- and 2-naphthol, which are among the most studied aromatic systems, show an excited-state intermolecular proton transfer to the medium (water, alcohols) [88-96]. The produced anionic structure emits at the blue side of the normal form. The effects of CD on the intermolecular proton-transfer reaction from 1-naphthol (1-NP) [97, 98] to water and from water to 1-aminopyrene (1-AP) [98] have been studied by emission spectroscopy. For 1-NP in pure water, the decay of the 360 nm emission band (that of the neutral reactive species leading to the anionic one emitting at the blue side, 460 nm) was fitted with a 36 ps exponential component [98]. In the presence of (S-CD, the decay at 370 nm needed two exponential functions with time constants of 700 ps (75%) and 1600 ps (25%) [98]. The average time constant for deprotonation of 1-NP in the presence of (S-CD (1 1... 

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