Analytical considerations of Eatons' formula for the interspin distance between unpaired electrons in ESR

Coffman, Robert E.; Pezeshk, Abbas

doi:10.1016/0022-2364(86)90360-4

Cited by 14 publications

(19 citation statements)

References 17 publications

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“…3 were obtained when the constant A was acquired according to Eq. 4 [12]. All calculated r(Cu-Cu) distances are summarized in Table 2, which also present the crystallographically determined distances and the deviations between the two values, Dr(Cu-Cu).…”

Section: Resultsmentioning

confidence: 99%

“…This method is also applicable to EPR spectra taken at multiple microwave frequencies (e.g., X-band, Q-band, and S-band). This can be seen in the subsequent work of Coffman and Pezeshk [12], who derived the following expression for A:…”

Section: Introductionmentioning

confidence: 88%

“…The interspin distances in these systems ranged from 4.5 to 11.5 Å . Equation 3 is general in nature and could be used for distance measurements greater than [4 Å where the anisotropic exchange is negligible [12]. In addition, Eq.…”

Section: Introductionmentioning

confidence: 99%

“…3 b Interspin distance calculated by means of A obtained from Eq. 4, which is based on the work of Coffman and Pezeshk[12] …”

mentioning

confidence: 99%

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Determination of intermolecular copper–copper distances from the EPR half-field transitions and their comparison with distances from X-ray structures: applications to copper(II) complexes with biologically important ligands

Švorec

Valko

Moncóľ

et al. 2008

Transition Met Chem

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An EPR method involving measurement of halffield transitions was applied to determine the intermolecular Cu-Cu distances in copper(II)-carboxylate complexes with biologically important ligands. The experimental powder EPR spectra are composed of allowed (DM S = ±1) transitions centered at *3,200 Gauss and of weak intensity, nominally forbidden, half-field (DM S = ±2) peaks observable at *1,600 Gauss. Values of the average interspin distance for each complex were determined from the ratios of integrated allowed and forbidden peak areas using each of several methods. The calculated interspin distances were correlated with the copper-copper distances experimentally obtained by X-ray crystallography. The distances determined from the EPR spectra agree well with the X-ray determined values when the crystallographic value for one member of a series is used to calibrate the series. Less satisfactory agreement is found when methods based on Cu-spin-label systems are used.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

“…3 b Interspin distance calculated by means of A obtained from Eq. 4, which is based on the work of Coffman and Pezeshk[12] …”

mentioning

confidence: 99%

See 2 more Smart Citations

Determination of intermolecular copper–copper distances from the EPR half-field transitions and their comparison with distances from X-ray structures: applications to copper(II) complexes with biologically important ligands

Švorec

Valko

Moncóľ

et al. 2008

Transition Met Chem

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show abstract

“…The distance of the two copper ions may be estimated from the EPR spectra by considering the ratio of the intensities of the areas of the Dms = ±2 and Dms = ±1 transitions [56][57][58]. The relevant areas may be calculated after numerical double integration of the experimental spectrum.…”

Section: Epr Spectroscopymentioning

confidence: 99%

Synthesis, structure and biological activity of copper(II) complexes with oxolinic acid

Psomas

Tarushi

Efthimiadou

et al. 2006

Journal of Inorganic Biochemistry

122

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Close Packing of Nitroxide Radicals in Stable Organic Radical Polymeric Materials

Bobela

Hughes

Braunecker

et al. 2015

J. Phys. Chem. Lett.

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The relationship between the polymer network and electronic transport properties for stable radical polymeric materials has come under investigation owing to their potential application in electronic devices. For the radical polymer poly(2,2,6,6-tetramethylpiperidine-4-yl-1-oxyl methacrylate), it is unclear whether the radical packing is optimal for charge transport partially because the relationship between radical packing and molecular structure is not well-understood. Using the paramagnetic nitroxide radical as a probe of the polymer and synthetic techniques to control the radical concentration on the methyl methacrylate backbone, we investigate the dependence of radical concentration on molecular structure. The electron paramagnetic resonance data indicate that radicals in the PTMA assume a closest approach distance to each other when more than 60% of the backbone is populated with radical pendant groups. Below 60% coverage, the polymer rearranges to accommodate larger radical-radical spacing. These findings are consistent with theoretical calculations and help explain some experimentally determined electron-transport properties.

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Analytical considerations of Eatons' formula for the interspin distance between unpaired electrons in ESR

Cited by 14 publications

References 17 publications

Determination of intermolecular copper–copper distances from the EPR half-field transitions and their comparison with distances from X-ray structures: applications to copper(II) complexes with biologically important ligands

Determination of intermolecular copper–copper distances from the EPR half-field transitions and their comparison with distances from X-ray structures: applications to copper(II) complexes with biologically important ligands

Synthesis, structure and biological activity of copper(II) complexes with oxolinic acid

Close Packing of Nitroxide Radicals in Stable Organic Radical Polymeric Materials

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