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Resonance Raman Spectra of 1‐(2‐Pyridylazo)‐2‐naphthol Adsorbed on Silica and Alumina
Author(s) -
Bisset Alison,
Dines Trevor J.
Publication year - 1996
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/(sici)1097-4555(199601)27:1<49::aid-jrs924>3.0.co;2-k
Subject(s) - raman spectroscopy , adsorption , chemistry , chemisorption , protonation , resonance (particle physics) , langmuir adsorption model , toluene , lewis acids and bases , inorganic chemistry , catalysis , organic chemistry , optics , ion , physics , particle physics
Resonance Raman spectra were recorded from 1‐(2‐pyridylazo)‐2‐naphthol (HPAN) adsorbed from toluene solution on to Aerosils 90, 130, 200 and 300 and γ‐alumina. In each case HPAN adsorption gave a good fit to a Langmuir adsorption isotherm. The spectra indicate that the adsorbed species consists mainly of physisorbed HPAN but there is also evidence for chemisorption of the protonated species (H 2 PAN + ). The latter results from interaction with Brønsted acidic sites on both silica and γ‐alumina. For HPAN adsorbed on γ‐alumina there is also evidence for interaction with Lewis acidic sites.