Stable Nitroxide Radicals

Forrester, A. R.; Thomson, R. H.

doi:10.1038/203074a0

Cited by 67 publications

(43 citation statements)

References 7 publications

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“…In the Grigor'ev paper a 15 was a function of ring size analogous to the C=O stretch of cyclic ketones. The findings that the peak positions of 5-membered cyclic nitroxides were up to 60 cm -1 higher than the known nitroxide range were at odds with the reports cited in the reviews [4,5] …”

Section: Introductionmentioning

confidence: 75%

“…By 1998 when Aurich published his review on the chemistry of nitroxides [4], the situation was much clearer. Aurich placed the characteristic IR absorptions for the N-O • bond in the range 1380 -1340 cm -1 by reference to the acyclic compounds DTBN [8], diphenylnitroxide [10] and the 6-membered cyclic nitroxides, TEMPONE VII and TEMPOL VIII [13].…”

Section: Introductionmentioning

confidence: 99%

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The vibrational group frequency of the N–O stretching band of nitroxide stable free radicals

Rintoul

Micallef

Bottle

2008

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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Section: Introductionmentioning

confidence: 75%

Section: Introductionmentioning

confidence: 99%

The vibrational group frequency of the N–O stretching band of nitroxide stable free radicals

Rintoul

Micallef

Bottle

2008

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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“…These findings indicate that the melted 2F5Me-and 5F2MeBPBN were chemically decomposed under such thermal conditions. The m-phenylene-bridged bisnitroxides are known to thermally change into isomeric diamagnetic compounds, aminoquinone imine N-oxide derivatives [6,10,26,27].…”

Section: Magnetic Propertiesmentioning

confidence: 99%

Thermally Activated Paramagnets from Diamagnetic Polymers of Biphenyl-3,5-diyl Bis(tert-butyl Nitroxides) Carrying Methyl and Fluoro Groups at the 2’- and 5’-Positions

2016

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Three new biradicals-2',5'-dimethyl-, 2'-fluoro-5'-methyl-, and 5'-fluoro-2'-methylbiphenyl-3,5-diyl bis(tert-butyl nitroxides)-were synthesized. The magnetic susceptibility measurements revealed their diamagnetism below and around room temperature. The nitroxide groups are located close to each other in an intermolecular fashion to form a weakly covalent head-to-tail (NO) 2 ring. Biradical molecules are connected on both radical sites, constructing a diamagnetic chain. The dimethyl derivative underwent a structural phase transition at 83˝C, clarified via differential scanning calorimetry and powder X-ray diffraction, and a paramagnetic solid phase with S = 1 irreversibly appeared. The other analogues exhibited a similar irreversible upsurge of the magnetic susceptibility on heating, but the transition was characterized as the melting.

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“…et Celles-ci, generalement imputees a Mc Connell('), decoulent respectivement des modeles de polarisation de spin et d'hyperconjugaison (2).…”

Section: Introduction De Separation Isotropes Hyperfines A(hd Et A(hunclassified

L'Évaluation Semi‐Empirique des Densités de Spin π dans les Radicaux Carbones

Leroy

Peeters

Sana

et al. 1988

Bulletin des Soc Chimique

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A critical analysis of the well known Mc Connell relations a = QpaS(Cu) leads us to propose a new value for the parameter Qp and an additive rule to calculate the spin densities, pas(C,). Other values of substituent parameters AX^ are also proposed. The difference between a(Hp)/Qp and the spin densities calculated by use of the additive relation is generally negative, in captodative-substituted ethyl radicals. Furtheron, it is found that the observed values of prs(Cq) are pretty well correlated to the corresponding thermodynamic stabilization energies, in the case of cd-substituted radicals.

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Stable Nitroxide Radicals

Cited by 67 publications

References 7 publications

The vibrational group frequency of the N–O stretching band of nitroxide stable free radicals

The vibrational group frequency of the N–O stretching band of nitroxide stable free radicals

Thermally Activated Paramagnets from Diamagnetic Polymers of Biphenyl-3,5-diyl Bis(tert-butyl Nitroxides) Carrying Methyl and Fluoro Groups at the 2’- and 5’-Positions

L'Évaluation Semi‐Empirique des Densités de Spin π dans les Radicaux Carbones

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