Abstract
The proton-transfer reaction of 1,8-diaminonaphthalene (1,8-DAN) in acidic medium was studied by means of fluorescence and picosecond spectroscopic techniques. It has been found that there are three different forms of 1,8-DAN in the ground state, but only two different forms in the excited state. The absorption of the mono-cation form of 1,8-DAN is found to be a mixture of the neutral form and the di-cation form. However, the emission is found to be the same as the neutral form, due to the fast dissociation of the mono-cation form once it is excited. The fluorescence of the mono-cation form of 1,8-DAN shows a small shift under different excitation wavelengths. The di-cation form only fluoresces if no free water cluster is available as a proton acceptor. The reaction in the excited state is shown to be a diabatic quenching reaction. With the help of quantum yields and fluorescence lifetime measurements these results are interpreted in terms of a new photochemical scheme. All dissociation and quenching rate constants, pK a and k q, have been determined.
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Al-Betar, AR., El-Rayyes, A. & Klein, U.K.A. Ground and Excited States Proton Transfer Reactions of 1,8-Diaminonaphthalene in Perchloric Acid Solutions. J Fluoresc 15, 689–696 (2005). https://doi.org/10.1007/s10895-005-2976-6
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DOI: https://doi.org/10.1007/s10895-005-2976-6