ESE Studies of Pristine Paramagnetic Species of C<sub>60</sub> Powder Samples

Pinhal, Nelson M.; Vugman, N.V.; Herbst, Marcelo H.; Dias, Gilson H. M.

doi:10.1021/jp9933572

Cited by 8 publications

(13 citation statements)

References 12 publications

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“…The EPR signals of triplet PC were also detected for pure C 60 powder by continuous wave EPR (CW‐EPR) and ESE spectroscopies in Refs. 4, 5. The values of the interspin distance in these cases were found to be equal to 19.3 Å 4, and 16.7 or 28 Å 5 when obtained from the CW‐EPR and ESE experiments, respectively.…”

Section: Introductionmentioning

confidence: 69%

“…The second type of PC with S = 1, observed in powder fullerite samples 3–5, was attributed to dimers formed by two PC with S = 1/2. These dimers lead to observation of EPR spectra of triplet PC ( S = 1).…”

Section: Introductionmentioning

confidence: 97%

“…Taking into account that the molecular spin of C 60 fullerene is equal to zero ( S = 0), no EPR signals should be expected for pure monomer phases. However, samples of the C 60 fullerite have shown presence of EPR signals 1–8. The main EPR signal of high‐purity polycrystalline C 60 powder is due to a doublet paramagnetic centers (PC) ( S = 1/2) with g = 2.0023–2.0030 and line width of 0.075–0.2 mT 2–7.…”

Section: Introductionmentioning

confidence: 99%

“…However, samples of the C 60 fullerite have shown presence of EPR signals 1–8. The main EPR signal of high‐purity polycrystalline C 60 powder is due to a doublet paramagnetic centers (PC) ( S = 1/2) with g = 2.0023–2.0030 and line width of 0.075–0.2 mT 2–7. This signal was attributed to a radical cation C

_{60}^{+}

, which represents an intrinsic hole type defect in the C 60 fullerite ( g ‐factors of hole type centers are higher than that of free electron, g e = 2.0023) 2, 4–7.…”

Section: Introductionmentioning

confidence: 99%

“…The main EPR signal of high‐purity polycrystalline C 60 powder is due to a doublet paramagnetic centers (PC) ( S = 1/2) with g = 2.0023–2.0030 and line width of 0.075–0.2 mT 2–7. This signal was attributed to a radical cation C

_{60}^{+}

, which represents an intrinsic hole type defect in the C 60 fullerite ( g ‐factors of hole type centers are higher than that of free electron, g e = 2.0023) 2, 4–7. Taking into account the dependence of intensity of the EPR signal of the doublet PC on the preparation conditions of the C 60 samples, particularly, the extent of their exposure to air and light, a number of authors 1, 3, 8 suggested a possibility of more complex structure for these PC.…”

Section: Introductionmentioning

confidence: 99%

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EPR study of the crystalline polymerized phases of C₆₀

Zhilinskaya¹,

Rakhmanina²,

Davydov³

et al. 2010

Physica Status Solidi (a)

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Comparative electron paramagnetic resonance (EPR) study of the monomer and 1D (orthorhombic) and 2D (tetragonal and rhombohedral) polymerized phases of C60 has been carried out. It was shown that the concentration of paramagnetic centers (PC) depends on the phase structure. Temperature dependences of the EPR spectra enabled separation of temperature‐dependent from temperature‐independent components of the main doublet signals, which were attributed to C 60+ radical (PC1) and to conducting electrons, respectively. Additional weak EPR signals, observed for the tetragonal and rhombohedral phases, were attributed to dimer PC2 formed by coupling of two PC1. Possible models for these centers are discussed.

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Section: Introductionmentioning

confidence: 69%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

_{60}^{+}

, which represents an intrinsic hole type defect in the C 60 fullerite ( g ‐factors of hole type centers are higher than that of free electron, g e = 2.0023) 2, 4–7.…”

Section: Introductionmentioning

confidence: 99%

_{60}^{+}

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

EPR study of the crystalline polymerized phases of C₆₀

Zhilinskaya¹,

Rakhmanina²,

Davydov³

et al. 2010

Physica Status Solidi (a)

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Electron Paramagnetic Resonance Spectroscopy

Dikanov¹,

Crofts²

Handbook of Applied Solid State Spectroscopy

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This chapter is devoted to magnetic resonance spectroscopy for the investigation of unpaired electron spins. Two terms are used in the literature: electron paramagnetic resonance (EPR) and electron spin resonance (ESR). We will use the first term in this chapter. During the sixty years since its discovery in 1944 by E.K. Zavoisky [1], EPR spectroscopy has been exploited as a very sensitive and informative technique for the investigation of different kinds of paramagnetic species in solid or liquid states.The first two parts of the chapter introduce the theoretical background and instrumentation used in two complementary approaches to EPR spectroscopy, i.e., continuous-wave and pulsed EPR. The final part describes typical areas of solid state applications. spectroscopy. Space limitations preclude references to all original publications and the reader is therefore referred to earlier reviews for a more complete survey of earlier work. Excellent textbooks in EPR spectroscopy cover basic materials [2-5]. Many monographs are devoted to the consideration of more specific topics including theory, instrumentation, or application to selected paramagnetic species [6][7][8][9][10][11][12][13][14][15][16][17][18][19]. Handbooks of EPR spectroscopy [20,21] are also available, as are periodic reviews on theory, experimental approaches, and different EPR applications covering the period since 1971 [22].A comprehensive description of pulsed EPR spectroscopy is given in the recently published book of Schweiger and Jeschke [23]. Previous literature on pulsed EPR includes two monographs [24,25], several edited books [18, 19,26,27], and a large number of reviews. An up-to-date list is provided in [23]. This chapter is based on an extensive literature devoted to EPR 3. Electron Paramagnetic Resonance Spectroscopy

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