Sean H. Gallagher

Analysis of the near-infrared spectra of C60−

Abstract Band analyses of the NIR spectra of two C 60 − salts in nine solvents reveal a previously unnoticed low-energy transition arising from a thermally populated excited electronic state. The viability of vibronic origin for three intermediate-energy transitions is confirmed. A multiplicity of weak high-energy transitions presently defies unique deconvolution and assignment.

Solvent/C60 interactions evidenced in the resonance Raman spectrum of C60

Abstract Substantial electronic and vibrational interactions between solvent and C 60 are revealed in the resonance Raman spectra of C 60 by the appearance of bands corresponding to 11 modes that are Raman and/or IR inactive. These bands result mainly from solvent-induced rather than isotope-induced lowering of symmetry of both the ground and excited states of C 60 . The nature of solvent interactions with the surface of C 60 are discussed.

Comment on “Genetic relationship between intrinsic Raman and infrared fundamental vibrations of the C60 and C70 fullerenes”: [J. Mol. Struct. 378 (1996) 147]

Abstract Brockner and Menzel [J. Mol. Struct. 378 (1996) 147] have recently presented the view that the effects of resonance in the Raman spectrum of C 70 are unclear and that the anomalies in polarization data have not been considered in the literature. In fact, three papers have addressed these issues, removing inconsistencies in the assignments of the vibrational modes of C 70 . In the work on C 60 , Brockner and Menzel [ibid] assign the H g (2) mode to a Raman band at 485 cm −1 . This contradicts earlier assignments to a band at 430 cm −1 and a recent reaffirmation at 427 cm −1 via resonance Raman spectroscopy. Additional features in the Raman spectrum of C 60 , proposed by Brockner and Menzel to arise from isomers of C 60 , are better explained by 13 C splitting and the symmetry-lowering effects of solute–solvent interactions.

RESONANCE RAMAN SPECTRA OF C70 IN BENZENE

Abstract Of the 53 Raman active bands of A 1 , E 2 ′, and E 1 ″ symmetries, 25 are observed in resonance Raman spectra of C 70 in benzene; excitation responses from 457.9 to 514.5 nm show that A -term, B -term, and probably D -term scattering mechanisms operate and assist in the assignment of the electronic spectrum.

Solvent Effects on the Resonance Raman Spectroscopy, Electronic Absorption Spectroscopy and Electrochemistry of Fullerenes and Fullerides

Abstract The symmetry of C60 and C70 in solution is reduced by specific solvent effects, which have been studied in detail by electrochemistry, and electronic absorption and resonance Raman spectroscopies. This review outlines how surface/solvent interactions involving the fullerenes affects their physical properties.