Emission Spectroscopic Evidence of Bronsted Acid Sites in a Calcinated Vycor Glass.
CALIFORNIA UNIV LOS ANGELES DEPT OF CHEMISTRY AND BIOCHEMISTRY
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The emission and excitation spectra of quinoline and 2,3-dichloroquinozaline embedded in a calcinated 600 C porous Vycor glass and dissolved in fluid solutions were recorded at various temperatures. The spectral characteristics and phosphorescence lifetimes of adsorbates were observed to be identical to those in 0.5 N sulphonic acid solutions, indicating that H transferred from the surface to the N-heterocyclics. The strong surface-adsorbate interaction is further revealed by the dynamic study of adsorbates at 77 and 4.2K.
- Organic Chemistry