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Investigations on 1,5‐diaminoanthraquinone by laser excitation
Author(s) -
Umadevi M.,
Ramakrishnan V.
Publication year - 2003
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.922
Subject(s) - bathochromic shift , chemistry , photochemistry , fluorophore , molecule , excited state , fluorescence , lone pair , raman spectroscopy , raman scattering , absorption (acoustics) , solvent , analytical chemistry (journal) , atomic physics , materials science , organic chemistry , optics , physics , composite material
Optical absorption and fluorescence emission spectra of 1,5‐diaminoanthraquinone (1,5‐DAAQ) in different solvents and the surface‐enhanced Raman scattering (SERS) spectrum of 1,5‐DAAQ in silver sol were investigated. Optical absorption and fluorescence emission studies revealed that the internal and external hydrogen bonds and reorientation of the solvent molecule around the excited state fluorophore are responsible for the observed bathochromic shift and the non‐radiative decay process in polar solvents. SERS studies showed that 1,5‐DAAQ molecules are chemisorbed through carbonyl groups and the lone pair of electrons on the nitrogen. The orientation of the molecule on the silver surface is found to be stand‐on. Copyright © 2002 John Wiley & Sons, Ltd.