E.s.r. spectra of some aromatic free radical anions which contain cumulated and unsaturated chains

Chippendale, J. C.; Gill, P. S.; Warhurst, E.

doi:10.1039/tf9676301088

Cited by 10 publications

(1 citation statement)

References 3 publications

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“…Aromatics with unsaturated side chains (-) (174) Polynuclear hydrocarbons-thermal treatment in air or anaerobic-molecular rearrangements (277).…”

Section: Generalmentioning

confidence: 99%

Electron paramagnetic resonance

Eargle¹

1968

Anal. Chem.

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Atherton, et al. ESR (49). Schlyapintokh. Free radicals and chemiluminescence (743).Horsfield. ESR applied to organic chemistry (398).Schoffa. Applications of ESR to biochemistry (742).Silver and Luz. 170 in NMR and ESR (776). THEORETICALA. Line Widths and Line Shapes Hf line widths from benzene (-) distortions ( 285).Benzene (-) line width theory (483).Anisotropic and spin-rotational VO2 + in aqueous solution (582).Tetrakistertbutoxyvanadium (IV) (489).V-acetylacetonates-sixth position coordination (875).

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“…Aromatics with unsaturated side chains (-) (174) Polynuclear hydrocarbons-thermal treatment in air or anaerobic-molecular rearrangements (277).…”

Section: Generalmentioning

confidence: 99%

Electron paramagnetic resonance

Eargle¹

1968

Anal. Chem.

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Electron Transfer and Conformational Interconversions in 1, n ‐Diphenylpolyenes

et al. 1988

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1,4‐Diphenylbutadiene (1), 1,6‐diphenylhexatriene (2), and 1,8‐diphenylocatatetraene (3) are reduced with alkali metals and the resulting paramagnetic monoanions and diamagnetic dianions characterized by ESR and (1H‐, 13C‐)NMR spectroscopy, respectively. The stereodynamic behavior of the ions is studied as a function of chain length, charge, and counterion. The reduction of 1, 2, and 3 serves as a model experiment for the doping of extended linear polyenes (polyacetylenes).

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Radical Ions in the Pentalene Series [1]. Part II. Dibenzo [b,f]pentalene and its 5, 10‐dimethyl derivative

Fürderer

Gerson

Rabinovitz

et al. 1978

Helvetica Chimica Acta

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Proton hyperfine data have been determined for the radical anions and cations of dibenzo [b,f]pentalene (III) and its 5, 10‐dimethyl derivative (IV). The assignment of the coupling constants to pairs of equivalent protons follows from a simple MO model, the use of which enables one to reproduce satisfactorily the experimental values. The proton hyperfine data, aHμ , for the radical anion III⊖. correlate fairly well with the π‐charge populations ϵμ derived from 1H‐NMR. spectra for the carbon centres μ in the dianion III2⊖. The analogous correlation is less good in the case of the radical cation III⊕. and the dication III2⊕., presumably due to the rough approximations involved in the evaluation of the numbers ϵμ for the latter species. The coupling constants aH5,10 for III⊖. and III⊕. are very close to the corresponding values aH4,6 for the radical ions of 1,3,5‐tri‐t‐butylpentalene (II), in accord with the prediction of the MO model. A similarity is also found between the proton hyperfine data for III⊖. and those for the radical anions of structurally related 1,4‐diphenyl‐1,3‐butadiene (V). On the other hand, there are striking changes in the coupling constants of the analogous protons on passing from III⊖. to the radical anions of dibenzo [a,e] cyclooctene (VI) and [16] annulene (VII), as a consequence of raising the symmetry from C2h to D2h and D4h, respectively.

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E.s.r. spectra of some aromatic free radical anions which contain cumulated and unsaturated chains

Cited by 10 publications

References 3 publications

Electron paramagnetic resonance

Electron paramagnetic resonance

Electron Transfer and Conformational Interconversions in 1, n ‐Diphenylpolyenes

Radical Ions in the Pentalene Series [1]. Part II. Dibenzo [b,f]pentalene and its 5, 10‐dimethyl derivative

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