Synthesis and electron-paramagnetic-resonance spectra of some new iminoxyl biradicals

Shapiro, A. B.; Suskina, V. I.; Федорова, В. В.; Rozantsev, É. G.

doi:10.1007/bf00849005

Cited by 6 publications

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“…, and R−O−S−O−R (VI), were synthesized as described in the literature [21][22][23][24]. Their melting points were in good correlation with the published ones.…”

Section: Methodsmentioning

confidence: 73%

Solvent effects on the intramolecular spin exchange in biradicals at room temperature

et al. 2007

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Solvent effects on intramolecular electron spin exchange in biradicals have been investigated in various solvents by electron spin resonance (ESR) spectroscopy at room temperature. Biradicals containing different radical fragments and bridges of different length and composition have been used. Interactions between solvent molecules and biradicals were found to take place at the radical fragment as well as at the functional group in the connecting bridge and have been proved to have an influence on the intramolecular spin exchange. The experimentally measured parameters, exchange integral (J) and characteristic time of an intramolecular movement (τ eff), have been compared with solvent viscosity and polarity parameters (macroscopic level) and longitudinal solvent relaxation time (microscopic level). The dependencies on viscosity and polarity were in good agreement with reported results. In addition, strong evidence of hydrogen bonding between solvent and different sites of the biradicals was found, in some cases even surpassing the other effects.

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“…, and R−O−S−O−R (VI), were synthesized as described in the literature [21][22][23][24]. Their melting points were in good correlation with the published ones.…”

Section: Methodsmentioning

confidence: 73%

Solvent effects on the intramolecular spin exchange in biradicals at room temperature

et al. 2007

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“…Biradicals (CH 2 ) 8 [COOCH 2 CH 2 R 6 ] 2 (B1) and (CH 2 ) 8 [CONHR 6 ] 2 (B2) in which R 6 is 1-oxyl-2,2,6,6-tetramethylpiperidine residue, used in this work, were synthesized as described in [2,3,28] and their colors and melting points were in good correlation with the published ones.…”

Section: Methodsmentioning

confidence: 70%

Intramolecular Mobility in Nitroxide Biradicals with Flexible Linkers

et al. 2020

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Intramolecular electron spin exchange has been studied by X-band electron paramagnetic resonance (EPR) spectroscopy in two long-chain flexible nitroxide biradicals existing in fluid solutions in three spectroscopy-different spatial conformations as a function of temperature, solvent viscosity and polarity. Certain thermodynamic parameters of the conformational transitions were calculated from the EPR spectra. The process of spin-exchange in these biradicals dissolved in five different alcohols was compared with that in the non-polar solvents (toluene) and aprotic (acetonitrile), as well as with two other biradicals studied earlier, and with thermodynamic characteristics of the solvents. A distinct correlation was found between macroscopic (solvent viscosity) characteristics of solvents and thermodynamic parameters of the intramolecular conformational transitions.

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22.1.4.11.10 X = 9 atoms

Forrester¹

Organic Cation Radicals and Polyradicals. Index of Substances for Volumes II/1 and II/9

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Synthesis and electron-paramagnetic-resonance spectra of some new iminoxyl biradicals

Cited by 6 publications

References 0 publications

Solvent effects on the intramolecular spin exchange in biradicals at room temperature

Solvent effects on the intramolecular spin exchange in biradicals at room temperature

Intramolecular Mobility in Nitroxide Biradicals with Flexible Linkers

22.1.4.11.10 X = 9 atoms

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