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Updated: May 6, 2026

Isolating Free Carbenes, their Mixed Dimers and Organic Radicals
Published on: April 19, 2019
Hyperfine coupling constants of the cyclohexadienyl radical in benzene and dilute aqueous solution
Iain McKenzie1, Robert Scheuermann, Stephen P Cottrell
1Centre for Molecular and Materials Science, TRIUMF , 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada.
Abstract:
The muon hyperfine coupling constant (Aμ) of the muoniated cyclohexadienyl radical (C6H6Mu) has been directly measured in a 5 mM solution of benzene in water by the radio-frequency muon spin resonance (RF-μSR) technique. The relative shift of Aμ in aqueous solution compared with the value in neat benzene (ΔAμ/Aμ = +0.98(5)% at 293 K) can now be compared directly with theoretical predictions. Application of the RF-μSR method to other dilute systems will provide extremely important information on understanding solvent effects.
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