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• W2051992014 abstract "On rappelle brievement les principes de la relaxation intermoleculaire d'un spin nucleaire, due aux fluctuations de ses interactions dipolaires magnetiques avec les spins electroniques des solutes paramagnetiques environnants. En saturant l'une des transitions permises de radicaux libres possedant une structure hyperfine, on obtient une polarisation dynamique nucleaire tres elevee, pouvant servir dans des magnetometres efficaces pour mesurer le champ terrestre. On presente une etude recente de deplacements paramagnetiques et de taux de relaxation des protons de solutes sonde en presence des complexes aqua des ions lanthanides trivalents Ln 3+ dans des solutions d'eau lourde. On determine ainsi les moments magnetiques electroniques effectifs des ions Ln 3+ ainsi que leurs temps de relaxation electronique longitudinale et transverse T 1e et T 2e On s'interesse particulierement a des chelates hydrates de gadolinium Gd(III), pouvant servir d'agents de contraste de relaxation en imagerie par resonance magnetique (IRM) medicale. On peut interpreter les spectres complets de resonance paramagnetique electronique (RPE) de ces complexes avec la theorie approchee de la relaxation due a Redfield. On explore par simulation Monte-Carlo les situations ou la theorie de Redfield devient imprecise. Pour chaque complexe de Gd(III), l'etude RPE conduit a une prediction de T 1e , en bon accord avec la mesure independante resultant d'une etude de dispersion de relaxation des protons des solutes sonde." @default.
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• W2051992014 date "2001-11-01" @default.
• W2051992014 modified "2023-10-18" @default.
• W2051992014 title "Intermolecular nuclear relaxation in paramagnetic solutions: from free radicals to rare earths" @default.
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• W2051992014 doi "https://doi.org/10.1016/s1387-1609(01)01332-9" @default.
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