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Raman and surface‐enhanced Raman spectroscopic studies of sulphanilic acid azochromotrope (SPADNS)
Author(s) -
Siu G. G.,
Chen Z. L.
Publication year - 1993
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.1250240308
Subject(s) - raman spectroscopy , aqueous solution , x ray photoelectron spectroscopy , molecule , adsorption , chemistry , surface enhanced raman spectroscopy , infrared , analytical chemistry (journal) , photochemistry , raman scattering , nuclear magnetic resonance , optics , organic chemistry , physics
The trisodium salt of 2‐(4‐sulphophenylazo)‐1,8‐dihydroxynaphthalene‐3,6‐disulphonic acid (SPADNS) was studied by Raman and surface‐enhanced Raman spectroscopy (SERS) techniques. The Raman spectra of SPADNS powder and aqueous solution were investigated and an assignment of the Raman bands was made taking into account its infrared absorpiton spectrum. SPADNS tatomers, o‐hydroxyazo and o‐quinone hydrazone, are also discussed. Although the assignment is still preliminary owing to the complex structure of the SPADNS molecule, it provides useful information for SERS investigations of SPADNS in aqueous silver sol and on silve film. The results of SERS are compared with those of visible absorption spectra and x‐ray photoelectron spectra (XPS) and the adsorption configuration of the SPADNS molecule on a silver surface is considered.