A Weak Field EPR Study of TANOL in Water and Water-Oil Using Dynamic Nuclear Polarization

Horasan, Nuray; Sünnetçioğlu, M. Maral; Sungur, Rıza; Bingöl, G.

doi:10.1515/zna-1997-6-703

Cited by 4 publications

(1 citation statement)

References 12 publications

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“…Practical 47,48 (e.g. O 2 and ESR imaging) and theoretical approaches, including DNP calculations 49 for 14 N vs 15 N nitroxides, cross-relaxation determinations 50 and solvent studies 51,52 have appeared lately.…”

Section: Introductionmentioning

confidence: 99%

ESR of newβ-phosphorus nitroxides from aldo- and keto-nitrones

Haire

Janzen

Hrvoic³

1999

Magn. Reson. Chem.

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This investigation deals mainly with the synthesis of new phosphorus–nitroxide free radicals. Nitroxides with a β‐31P group were synthesized from the aldo‐nitrones α‐phenyl‐N‐tert‐butylnitrone and 5,5‐dimethyl‐1‐pyrroline‐N‐oxide (DMPO) as well as the keto‐nitrones 2,5,5‐trimethyl‐1‐pyrroline‐N‐oxide (2,5,5‐M3PO) and 2‐phenyl‐5,5‐dimethyl‐1‐pyrroline‐N‐oxide (2‐Ph‐DMPO). Three different routes were explored. The first two routes involved nitronyl spin trapping of phosphorus‐centred radicals generated thermally or photochemically by hydrogen abstraction by tert‐butoxyl radicals from di‐tert‐butyl peroxyoxalate or from photoexcited benzophenone, respectively. The third approach used the addition of phosphorus anions (generated by the strong, hindered base lithium diisopropylamide) to the nitrones and subsequent one‐electron oxidation to the corresponding nitroxides. The most novel feature of the work presented here may be the synthesis of β‐phosphoranyl [P(OR)4] nitroxide spin adducts. For comparison purposes the related β‐phosphityl [P(O)(OR)2] nitroxides were also assembled and characterized by ESR spectroscopy. Copyright © 1999 John Wiley & Sons, Ltd.

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