Spectral characteristics of 2-aminodiphenylamine in different solvents and at various pH values.


Journal Article

The absorption and fluorescence spectra of 2-aminodiphenylamine (2ADA) have been studied as a function of solvent polarity and acid concentration. Analysis of solvatochromic and prototropic shifts of 2ADA reveals: (i) the presence of intramolecular hydrogen bonding between imino and amino groups in the ground state, (ii) dual fluorescence (360 and 430 nm) of the monocation (2ADA+) formed by the protonation of amino group; and (iii) proton-induced quenching of the monocation (2ADA+) fluorescence. In the dual fluorescence of 2ADA+, the longer wavelength emission at 430 nm is found to be from the twisted form of the monocation. The rate constants of the proton-induced quenching of 2ADA+ are determined.

Full Text

Cited Authors

  • Nayaki, SK; Swaminathan, M

Published Date

  • June 2001

Published In

Volume / Issue

  • 57 / 7

Start / End Page

  • 1361 - 1367

PubMed ID

  • 11446691

Pubmed Central ID

  • 11446691

Electronic International Standard Serial Number (EISSN)

  • 1873-3557

International Standard Serial Number (ISSN)

  • 1386-1425

Digital Object Identifier (DOI)

  • 10.1016/s1386-1425(00)00469-8


  • eng