1999
DOI: 10.1021/jp9927000
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Abstract: The effect of the orientating potential in the E7 liquid crystal on a series of fulleropyrrolidine bisadducts has been examined. Photoexcited triplet states, populated by spin−orbit promoted intersystem crossing, have been used as spin probes to determine the preferential orientations of the guest molecules in the anisotropic medium. Time-resolved electron paramagnetic resonance (TREPR) spectroscopy has been applied and spectra with the external magnetic field set parallel or perpendicular to the director n of… Show more

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Cited by 11 publications
(11 citation statements)
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“…Recently, the properties of the photoexcited triplet state of some mono- and bis-adducts of C 60 were studied by TREPR. It was found that the spin distribution varies only slightly upon addition of adducts, their chemical nature, and position. On the other hand, a larger deviation of D relative to that of the pristine C 60 was found only in more strained structures. , In addition, chemical bonding destroys the high electronic degeneracy and reduces the influence of a pseudorotation and the dynamic Jahn−Teller effect.…”
Section: Resultsmentioning
confidence: 99%
“…Recently, the properties of the photoexcited triplet state of some mono- and bis-adducts of C 60 were studied by TREPR. It was found that the spin distribution varies only slightly upon addition of adducts, their chemical nature, and position. On the other hand, a larger deviation of D relative to that of the pristine C 60 was found only in more strained structures. , In addition, chemical bonding destroys the high electronic degeneracy and reduces the influence of a pseudorotation and the dynamic Jahn−Teller effect.…”
Section: Resultsmentioning
confidence: 99%
“…For the sake of comparison, the line shape obtained under the assumption of uniaxial orientation of the e bisadduct is shown in Figure d; its inadequacy to simulate the 240 GHz spectrum clearly appears. In the past, X band spectra of organic solutes of various symmetries were interpreted by assuming uniaxial behavior …”
Section: Resultsmentioning
confidence: 99%
“…On the other hand, the orientation of the principal axes of magnetic tensors in the molecule requires the study of doped single crystals, normally difficult to obtain. The use of uniaxial media, such as nematic liquid crystals, was suggested, , but the low resolution of X-band EPR spectra and the lack of knowledge of the molecular orientation in the anisotropic medium prevented the assignment of the principal directions to the molecular structure …”
Section: Introductionmentioning
confidence: 99%
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“…For a complete assessment of the reciprocal orientation of the ZFS tensor and molecular frames, some information on the preferred direction of alignment of the molecules in the liquid crystal solvent is required. Fortunately, this information can often be obtained from symmetry considerations in conjunction with the requirement of cylindrical symmetry of the mesophase around the LC director [26][27][28]. In such cases, the location of the ZFS tensor axes within the molecular frame and therefore the sign of the zero-field splitting parameter, D, can directly be inferred from the EPR data of aligned samples.…”
Section: Introductionmentioning
confidence: 99%