Spectral characteristics of 2-aminodiphenylamine in different solvents and at various pH values.
Journal - Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy (England )
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.
|ISSN : ||1386-1425|
|Mesh Heading : ||Hydrogen-Ion Concentration Onium Compounds Phenylenediamines Solvents Spectrometry, Fluorescence|
|Mesh Heading Relevant : ||chemistry chemistry|