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|Title:||Dissociation constants of 3-hydroxy-2-naphthylamine in the ground and excited singlet states|
|Authors:||Sarpal, R S|
Dogra, S K
|Abstract:||Absorption spectra of 3-hydroxy-2-naphthylamine at various acid concentrations indicate the presence of five species, viz. the dication, monocation, neutral, monoanion and dianion, whereas the fluorescence spectra of the above compound under similar conditions yield six species, the zwitter ion being the sixth, besides the above five. The excitation fluorescence spectrum has established that monocation is the ground state precursor for the zwitterion. Proton-induced fluorescence quenching is observed for the monocation. The dication is formed by the protonation of the amino group and the ring carbon atom, whereas the dianion is formed by the deprotonation of the hydroxyl group and - C - H bond in the So state but by the deprotonation of - OH and - NH2 groups in the SI state. The prototropic equilibrium between neutral and monoanion species is not established in S1 state during the lifetimes of the conjugate acid-base pair.|
|Appears in Collections:||IJC-A Vol.28A(10) [October 1989]|
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