title: Solvent effect in β-phosphorylated nitroxides. Part 4: detection of traces of water by electron paramagnetic resonance.
abstract: For decades, the nitrogene hyperfine coupling constant aN of nitroxides has been applied to probe their environment using EPR. However, the small changes observed (≈2 G from n-pentane to water) with the solvent polarity allow only a qualitative discussion. A stable β-phosphorylated nitroxide exhibiting a small change in aN (≈3 G from n-pentane to water) and a striking change (≈25 G from n-pentane to water) in phosphorus hyperfine coupling constant aP with the polarity of solvent was prepared and used to develop the first procedure for the titration of water in THF by EPR, down to 0.1% v/v.
authors.affiliation: Aix-Marseille Université, CNRS, ICR, UMR 7273, case 551, Avenue Escadrille Normandie-Niemen, 13397 Marseille Cedex 20, France. sylvain.marque@univ-amu.fr g.audran@univ-amu.fr paul.bremond@univ-amu.fr.
authors.forename: Gérard
authors.initials: G
authors.lastname: Audran
authors.forename: Lionel
authors.initials: L
authors.lastname: Bosco
authors.forename: Paul
authors.initials: P
authors.lastname: Brémond
authors.forename: Teddy
authors.initials: T
authors.lastname: Butscher
authors.forename: Sylvain R A
authors.initials: SR
authors.lastname: Marque