Conformational s-cis/trans isomerization in free radicals observed by muon level crossing resonance spectroscopy

Journal Article · Wed Sep 26 00:00:00 EDT 1990 · Journal of the American Chemical Society; (United States)

DOI:https://doi.org/10.1021/ja00176a013· OSTI ID:5467326

Barnabas, M V; Venkateswaran, K; Walker, D C ^[1]

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1. Univ. of British Columbia, Vancouver (Canada)

A rare type of cis-trans isomerism arises from restricted rotation about a single C-C bond and has been seen here by level crossing resonance spectroscopy (LCR) in muonated free radicals. It is observed as a splitting of the proton's LCR when the C-atom adjacent to the unpaired electron density is an asymmetric sp{sup 2} hybrid. Free radicals which contain C's with sp{sup 3}, symmetric sp{sup 2}, or sp hybrid bonds do not show this geometric isomerism. The {alpha}-protons on these radicals show resolvable splitting less easily than the {beta}-protons. The radicals observed are those resulting from formal addition of muonium to the C{double bond}C bonds of acrylates, and they occur regardless of whether the compounds are studied in dilute aqueous solution or as pure liquids.

• OSTI ID: 5467326
• Journal Information: Journal of the American Chemical Society; (United States), Vol. 112:20; ISSN 0002-7863
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
RADICALS
ION CYCLOTRON RESONANCE SPECTROSCOPY
ACRYLATES
AQUEOUS SOLUTIONS
ISOMERIZATION
MEASURING METHODS
MUONS
CARBOXYLIC ACID SALTS
CHEMICAL REACTIONS
DISPERSIONS
ELEMENTARY PARTICLES
FERMIONS
ION SPECTROSCOPY
LEPTONS
MIXTURES
SOLUTIONS
SPECTROSCOPY
400201* - Chemical & Physicochemical Properties