Single C-C bond in (<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">C</mml:mi></mml:mrow><mml:mrow><mml:mn>60</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msubsup><mml:mrow><mml:mo>)</mml:mo></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow><mml:mrow><mml:mn>2</mml:mn><mml:mi mathvariant="normal">−</mml:mi></mml:mrow></mml:msubs

His research interests include reactive cation and superacid chemistry with inert carborane counterions, ionic liquids, bioinorganic chemistry, spin-coupling phenomena, fullerene chemistry, and new carbon-or porphyrin-based materials. He is a Sloan Fellow, a Dreyfus Teacher−Scholar Awardee, and a Guggenheim Fellow. Robert Bolskar received his B.S. degree in Chemistry from Carroll College in Waukesha, WI, in 1992. He earned his Ph.D. degree at the University of Southern California in Los Angeles under the direction of Christopher Reed in 1997, investigating the synthetic redox chemistry of fullerene anions and cations. In 1998 he moved to the University of California, Riverside, as Managing Research Associate. He is currently Senior Chemist at TDA Research in Wheat Ridge, CO. His research interests include the chemistry and physics of fullerene compounds, supramolecular chemistry, strongly oxidizing systems, and electrophilic cations.

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“…Dimeric 22 and polymeric 23 AC 60 phases containing C-C bonded fullerides have become quite well characterized in recent years.…”

Section: Introduction Scope and Nomenclaturementioning

confidence: 99%

Discrete Fulleride Anions and Fullerenium Cations

2000

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“…1.͒ Charged C 60 's polymerize with the same 2ϩ2 cycloaddition connections, or by forming atom-atom connections, each consisting of one C-C bond between neighboring C 60 's. The observed polymerized C 60 structures include dimers 6,7 orthorhombic onedimensional ͑1D͒ chains, [8][9][10] tetragonal and rhombohedral two-dimensional ͑2D͒ lattices, 4,11 and some disordered 3D structures, 12 among others. 13 Methods of preparing the 2 ϩ2 cycloaddition dimer include mechanochemical reaction of C 60 with KCN or Li, 7,14 high-temperature phototransformation, 15 quasihydrostatic compression, 16 and pressurization of the template compound (ET) 2 C 60 .…”

Section: Introductionmentioning

confidence: 99%

“…8,9 These charged 1D chains are structurally indistinguishable, by x-ray diffraction, 10,19 from the neutral 1D chains made by HPHT processes. Finally, the charged C 60 dimer with an atom-atom connection may be made by quenching AC 60 , 6 and more exotic atom-atom phases have been created in Na 4 C 60 and Na 2 RbC 60 . 11,20 Vibrational spectroscopy is well suited to the study of molecular symmetry and symmetry reductions, and has been used extensively to investigate C 60 and fullerene-derived materials.…”

Section: Introductionmentioning

confidence: 99%

Far-infrared vibrational properties of high-pressure high-temperatureC60polymers and theC60
Long
¹
,
Musfeldt
²
,
Kamarás
³

et al. 2000
Phys. Rev. B
29
2
33
0
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We report high-resolution far-infrared transmission measurements of the 2ϩ2 cycloaddition C 60 dimer and two-dimensional rhombohedral and one-dimensional orthorhombic high-pressure high-temperature C 60 polymers. In the spectral region investigated (20-650 cm Ϫ1 ), we see no low-energy interball modes, but symmetry breaking of the linked C 60 balls is evident in the complex spectrum of intramolecular modes. Experimental features suggest large splittings or frequency shifts of some I h C 60 -derived modes that are activated by symmetry reduction, implying that the balls are strongly distorted in these structures. We have calculated the vibrations of all three systems by first-principles quantum molecular dynamics and use them to assign the predominant I h C 60 symmetries of observed modes. Our calculations show unprecedentedly large downshifts of T 1u ͑2͒-derived modes and extremely large splittings of other modes, both of which are consistent with the experimental spectra. For the rhombohedral and orthorhombic polymers, the T 1u ͑2͒-derived mode that is polarized along the bonding direction is calculated to downshift below any T 1u ͑1͒-derived modes. We also identify a previously unassigned feature near 610 cm Ϫ1 in all three systems as a widely split or shifted mode derived from various silent I h C 60 vibrations, confirming a strong perturbation model for these linked fullerene structures.

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“…The N atoms are in a trans configuration with a 'closed' C-N network on the ball [19]. This structure is also very similar to the molecular structure of isoelectronic dimersied C 60 - [20,21]. Additional experimental evidence for this predicted configuration was found by analysing the parent hydroheterofullerene C 59 HN [22] and by using the N 1s excitation spectrum as a local probe of the chemical environment of the N site [23].…”

mentioning

confidence: 51%

The electronic structure of polymerized fullerenes and dimerized heterofullerenes

Pichler

Knupfer²,

Golden³

et al. 1997

Applied Physics A: Materials Science & Processing

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The electronic structure of polymerized fullerenes and dimerized heterofullerenes Pichler, T.; Knupfer, M.; Golden, M.S.; Fink, J.; Winter, J; Haluska, M.; Kuzmany, H.; Keshavarz, K.; Bellavia-Lund, C.; Sastre, A. Take-down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.Downloaded from the University of Groningen/UMCG research database (Pure): http://www.rug.nl/research/portal. For technical reasons the number of authors shown on this cover page is limited to 10 maximum. Abstract. We present studies of the electronic structure of polymerized orthorhombic Rb 1 C 60 and dimerised C 59 N using electron energy-loss spectroscopy in transmission. From the C1s excitation spectra a reduced density of π* states is observed for polymerized Rb 1 C 60 . This is in contrast to (C 59 N) 2 and can be explained by the different type of 'doping' and by the different bonding between the fullerene molecules in the two systems. Additional information about the optical properties was obtained from the low energy loss function. Using a Kramers-Kronig analysis, the dielectric function, (ε), and the optical conductivity, (σ), have been derived. ε(0) and the onset of the spectral weight have been compared between the polymer, the dimer and C 60 . This onset of spectral weight is found to be at 1.2 and 1.4 eV for o-Rb 1 C 60 and for (C 59 N) 2 , respectively.

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Single C-C bond in (C60)22−

Cited by 118 publications

References 31 publications

Discrete Fulleride Anions and Fullerenium Cations

Discrete Fulleride Anions and Fullerenium Cations

Far-infrared vibrational properties of high-pressure high-temperatureC60polymers and theC60
Long
¹
,
Musfeldt
²
,
Kamarás
³

et al. 2000
Phys. Rev. B
29
2
33
0
View full text Add to dashboard Cite

The electronic structure of polymerized fullerenes and dimerized heterofullerenes

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Single C-C bond in (C60)22−

Cited by 118 publications

References 31 publications

Discrete Fulleride Anions and Fullerenium Cations

Discrete Fulleride Anions and Fullerenium Cations

Far-infrared vibrational properties of high-pressure high-temperatureC60polymers and theC60Long1, Musfeldt2, Kamarás3 et al. 2000Phys. Rev. B292330View full textAdd to dashboardCite

The electronic structure of polymerized fullerenes and dimerized heterofullerenes

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About

Far-infrared vibrational properties of high-pressure high-temperatureC60polymers and theC60
Long
¹
,
Musfeldt
²
,
Kamarás
³

et al. 2000
Phys. Rev. B
29
2
33
0
View full text Add to dashboard Cite