Transient ESR nutation signals in excited aromatic triplet states

Furrer, Reinhard; Fujara, P.; Lange, C.A. de; Stehlik, D.; Vieth, Hans‐Martin; Vollmann, W.

doi:10.1016/0009-2614(80)80526-4

Cited by 102 publications

(53 citation statements)

References 13 publications

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“…4c was recorded at 40 K, while spectra relative to derivatives 2 and 3 (Figs. 4a and 4b) were taken at 160 K. The oscillations of the signal intensity are due to transient nutations [36].…”

Section: Resultsmentioning

confidence: 99%

Spin polarization in fullerene derivatives containing a nitroxide group. Observation of the intermediate photoexcited quartet state in radical triplet pair interaction

et al. 1997

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A series of C-60 fullerene derivatives containing a nitroxide group has been photoexcited by short LASER pulses in the microwave cavity of a cw-EPR spectrometer. Strongly spin polarized signals have been observed, in glassy matrix as well as in liquid solution, for both the ground electronic state and the excited quartet state. In the quartet state the excitation resides in the fullerene part and the molecule constitutes a triplet-radical pair with the partner covalently linked. The absorptive or emissive character of the transitions is explained in terms of the mechanism of radical-triplet interaction producing spin polarization. Opposite initial sign and polarization patterns are observed for molecules with different spacer between nitroxide and fullerene. The time evolution of the relevant sublevel populations is fitted by a kinetic model taking into account quartet decay constants, quartet and doublet spin-lattice relaxation rates and branching ratios

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“…4c was recorded at 40 K, while spectra relative to derivatives 2 and 3 (Figs. 4a and 4b) were taken at 160 K. The oscillations of the signal intensity are due to transient nutations [36].…”

Section: Resultsmentioning

confidence: 99%

Spin polarization in fullerene derivatives containing a nitroxide group. Observation of the intermediate photoexcited quartet state in radical triplet pair interaction

et al. 1997

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“…The pulsed EPR technique has been used by Moenne-Loccoz et al (280) (348) and has been seen as evidence for the anisotropic nature of the spectrum.…”

Section: Secondary Radical Pairmentioning

confidence: 99%

Radicals and Radical Pairs in Photosynthesis

Angerhofer

Bittl

1996

Photochem & Photobiology

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“…~-~----~g~(r 2 = 1.5-73 (5) the spectral width of 2D~24 mT corresponds to ah average distance of 0.63 nm, which is areasonable intermolecular separafion.…”

Section: __~~) G~mentioning

confidence: 99%

“…The complementarity of these two techniques and the advantages of the former in solid state applications are considered in a recent review [4]. Previous applications of transient EPR spectroscopy in ordered systems have focused on the dynamics of triplet state guest molecules in crystalline [5], glass [6] and liquid crystalline [7,8] mat¡…”

Section: Introductionmentioning

confidence: 99%

The application of time resolved EPR to the study of photoreactive molecules in solid and liquid crystalline environments

et al. 1990

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Abstract_ The use of transient EPR spectroscopy for the study of photoreactions in solid and liquid crystalline is demonstrated. The method is applied to an intramolecular photoreaction in 2-(4-methylpentyl)-7-nonanoylfluorene (MPNOF) and to ah intermolecular photoreaction in 4-cyano-4'-octylbiphenyl (8CB) doped with phenazine. It is shown that both MPNOF and phenazine undergo photoreactions via their first excited triplet state. Odentational ordering in the solid and Iiquid crystalline phase is studied via the excited triplet powder spectrum. Spectra of precursor and products can be identified and separated by their kinetics. The possible nature of the products of reaction is discussed.

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Transient ESR nutation signals in excited aromatic triplet states

Cited by 102 publications

References 13 publications

Spin polarization in fullerene derivatives containing a nitroxide group. Observation of the intermediate photoexcited quartet state in radical triplet pair interaction

Spin polarization in fullerene derivatives containing a nitroxide group. Observation of the intermediate photoexcited quartet state in radical triplet pair interaction

Radicals and Radical Pairs in Photosynthesis

The application of time resolved EPR to the study of photoreactive molecules in solid and liquid crystalline environments

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