Deuterium NMR of molecules adsorbed on active alumina

H. E. Gottlieb, Z. Luz

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

Deuterium NMR spectra were recorded of a number perdeuterated compounds adsorbed on active alumina. The compounds include benzene, p-xylene, pyridine, acetone, acetonitrile, cyclohexane, methanol, and water and were studied in the range probe/alumina = 0.02 to 0.30 (w/w). In most cases the spectra were typical of powder samples exhibiting a finite quadrupole interaction tensor. The quadrupole parameters depend on the probe/alumina ratio and on the temperature. The results are interpreted in terms of a model in which each crystallite surface supports an ordered layer of molecules which are in fast dynamic equilibrium with disordered "bulk" molecules associated with the same surface. In the case of benzene the average quadrupole tensor was found to be biaxial and in the case of acetone the spectrum appears to be a superposition of spectra from two distinct sites. The results demonstrate that deuterium NMR may provide a useful tool for the study of molecular ordering and molecular motion of adsorbed probes and may become an important complementary technique for the study of interface systems in general.

Original languageEnglish
Pages (from-to)257-271
Number of pages15
JournalJournal of Magnetic Resonance (1969)
Volume54
Issue number2
DOIs
StatePublished - Sep 1983
Externally publishedYes

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