Accession Number : ADA181120

Title :   Emission Spectroscopic Evidence of Bronsted Acid Sites in a Calcinated Vycor Glass.

Descriptive Note : Technical rept.,

Corporate Author : CALIFORNIA UNIV LOS ANGELES DEPT OF CHEMISTRY AND BIOCHEMISTRY

Personal Author(s) : Lin,C T ; Hsu,W L ; Yang,C L ; El-Sayed,M A

PDF Url : ADA181120

Report Date : 18 May 1987

Pagination or Media Count : 23

Abstract : 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.

Descriptors :   *ACIDS, *QUINOLINES, ADSORBATES, DYNAMICS, EMISSION SPECTROSCOPY, EXCITATION, FLUIDS, LIFE SPAN(BIOLOGY), PHOSPHORESCENCE, SPECTRA

Subject Categories : Organic Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE