NUCLEAR MAGNETIC RESONANCE EFFECTS IN SYSTEMS WITH STERICALLY INTERFERING PROTONS

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1956

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Ohio State University

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The nuclear magnetic resonance spectra of about 40 polynuclear aromatic hydrocarbons have been examined. It has been found that the largest chemical shifts are due to direct proton-proton interference between suitably placed neighbours. These may be in identical or non-identical environments and are consequently not electron coupled spin-spin effects, but ""repulsive"" chemical shifts. Using ring systems of different shapes and sizes, a correlation between proton-proton distance and shifts has been found. Some new ideas about steric hindrance are suggested.

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Author Institution: Department of Chemistry, The University of British Columbia

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http://hdl.handle.net/1811/7522

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Abstracts of OSU International Symposium on Molecular Spectroscopy 1946-1959