Photochemistry and excited state prototropic behaviour of 8-amino 2-naphthol

[Display omitted] ► Spectral and time resolved properties of 8-amino-2-naphthol are investigated. ► Some interesting pH dependent features for this compound are noticed. ► At lower pH (1.7), cation/neutral dynamic equilibrium exists in the excited state. ► At neutral pH, it exhibits larger Stokes sh...

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Bibliographic Details
Published in:Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy Molecular and biomolecular spectroscopy, 2013-05, Vol.109, p.164-172
Main Authors: Gahlaut, Richa, Joshi, Hem C., Joshi, Neeraj K., Pandey, Neetu, Pant, Sanjay
Format: Article
Language:English
Subjects:
8-Amino-2-naphthol
Equilibrium
Kamlet–Taft
Prototropic
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Summary:[Display omitted] ► Spectral and time resolved properties of 8-amino-2-naphthol are investigated. ► Some interesting pH dependent features for this compound are noticed. ► At lower pH (1.7), cation/neutral dynamic equilibrium exists in the excited state. ► At neutral pH, it exhibits larger Stokes shifted emission. ► The spectral signatures indicate various emitting/absorbing species. In the present work, photophysical behaviour of 8-amino 2-naphthol in various solvents as well as at various pH values has been investigated. Various ground and excited state species are noticed. It exhibits a completely different photo prototropic behaviour as compared to its parent molecule 2-naphthol. The spectral and transient studies indicate that at lower pH values, equilibrium between cation and neutral exists in the excited state. At neutral pH some peculiar behaviour in its spectral properties is noticed.
ISSN:1386-1425
DOI:10.1016/j.saa.2013.01.091