Hyperfine coupling constants and their dependence on charge densities

Colpa, J.P.; Bolton, James R.

doi:10.1080/00268976300100311

Cited by 181 publications

(36 citation statements)

References 14 publications

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“…The asymmetry parameters ' 1/ due to (b) are estimated to be zero for trans- [CoCI 2 (NH a ) 4]CI and 0.18 for the other compounds. The variation in the shift of the observed ' 1/ from these values could be explained as a result of different contributions of the crystalline field in each of these compounds.…”

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confidence: 99%

Comment on the ``Anomalous'' ESR Spectrum Spread for Pentacene Anion and Cation Radicals

Bolton

1967

The Journal of Chemical Physics

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confidence: 99%

Comment on the ``Anomalous'' ESR Spectrum Spread for Pentacene Anion and Cation Radicals

Bolton

1967

The Journal of Chemical Physics

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“…The splitting value is found to be 25% larger than that of the benzene anion radical. The difference between negative and positive ion radicals of alternant aromatic hydrocarbons has been studied by many workers from experimental and theoretical points of view.7,10-17) Bolton et al 12) have predicted that proton hyperfine coupling constants of positive ions should be larger than those of corresponding negative ions as a result of difference in charge density and obtained the following equation.…”

Section: Discussionmentioning

confidence: 99%

Electron Spin Resonance Study on Ultraviolet Light Irradiated Benzene Adsorbed on Silica Gel and Alumina

Tanei¹

1968

Bulletin of the Chemical Society of Japan

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Benzene adsorbed on silica gel was irradiated at 77°K with ultraviolet light. Three kinds of samples, with different degree of adsorption, were examined. ESR spectra were strongly dependent on the amount of benzene adsorbed and three different spectra were observed; (1) six-line spectrum with a splitting value of 6 gauss, assigned to phenyl radical, (2) seven-line spectrum with a splitting value of 4.5 gauss, assigned to benzene cation radical, and (3) apparent nine-line spectrum with 2.4 gauss splitting due to benzene dimer cation radical. Upon raising temperature, benzene cation radical was found to transform into benzene dimer cation radical. In UV-irradiated benzene-alumina system, cyclohexadienyl radicals were observed in addition to the ion radicals. It is suggested that the above reaction may be occurred by two photon absorption process involving the excitation of triplet benzene.

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“…Dieser auch fur andere cyclische z-Systeme bekannte Befund [20] lasst sich uber eine enveiterte McConnell-Beziehung (GI. 3 ) erfassen, in welcher die unterschiedlichen Ladungsdichten an jeweils gleichen Zentren der Radikal-Kationen und Radikal-Anionen durch einen Zusatzterm KE, beriicksichtigt werden [21]:…”

Section: Fig 1 Hmo-eigmwert-schemata Fur Radialene (>C'=ch) Mil Runclassified

Einelektronen‐Redox‐Reaktionen von Octamethyl[4]radialen: Nachweis der Alternanz geradzahliger Radialene

Bock

Rohn

1991

Helvetica Chimica Acta

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One-Electron Redox Reactions of Octamcthyl[4jradialene: Proof of the Alternancy of Even-Membered RadialenesThe photoelectron spectrum of octamethyl[4]radialene ( = tetrukis(dimethylmethy1idene)cyclobutune) yields the rather low first vertical ionization of only 7.30 eV and, therefore, the molecule can be oxidized by AICI,/CH,CI, to its radical cation. The ESR and ENDOR signal patterns recorded are almost identical with those of the radical anion, generated in a [2.2.2]cryptand THF solution by reduction at a potassium metal mirror. Their near congruency is in accord with the alternant rr molecular properties of even-membered radialenes as predicted by HMO theory, and larger changes of the D,, structure of C,(CH,), during the redox reactions are presumably hindered by the steric overcrowding in persubstituted [4]radialenes.

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Hyperfine coupling constants and their dependence on charge densities

Cited by 181 publications

References 14 publications

Comment on the ``Anomalous'' ESR Spectrum Spread for Pentacene Anion and Cation Radicals

Comment on the ``Anomalous'' ESR Spectrum Spread for Pentacene Anion and Cation Radicals

Electron Spin Resonance Study on Ultraviolet Light Irradiated Benzene Adsorbed on Silica Gel and Alumina

Einelektronen‐Redox‐Reaktionen von Octamethyl[4]radialen: Nachweis der Alternanz geradzahliger Radialene

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