Solid state 19F NMR study of acceptor-doped fullerenes (MF6)2C60 (M = As, Sb)

A. M. Panich; H. M. Vieth; P. K. Ummat; W. R. Datars

doi:10.1016/S0921-4526(02)01708-8

Solid state ¹⁹F NMR study of acceptor-doped fullerenes (MF₆)₂C₆₀ (M = As, Sb)

A. M. Panich, H. M. Vieth, P. K. Ummat, W. R. Datars

Department of Physics

Research output: Contribution to journal › Article › peer-review

17 Scopus citations

Abstract

We report on temperature-dependent ¹⁹F NMR measurements of solid C₆₀ intercalated with AsF₅ and SbF₅ acceptor species. Structure, molecular dynamics and possible phase transitions in the compounds are studied. The temperature dependence of the second moment, S₂, of (AsF₆)₂C₆₀ is typical for activation of molecular mobility on heating. The reorientation of the (AsF₆)^- complex is random and lasts at least down to 67K. The temperature dependence of S₂ for (SbF₆)₂C₆₀ showing significant change in the range of 200-270K is discussed. Further narrowing of the ¹⁹F spectra of (SbF₆)₂C₆₀ on heating occurs around 320K. ¹⁹F spectra at 7.04T resolve two resonances corresponding to different fluorine species. Suggesting that these species randomly occupy two different interstitial sites, we give reasons for the absence of superconductivity down to 5K in the compounds under study.

Original language	English
Pages (from-to)	102-107
Number of pages	6
Journal	Physica B: Condensed Matter
Volume	327
Issue number	1
DOIs	https://doi.org/10.1016/S0921-4526(02)01708-8
State	Published - 1 Mar 2003

Keywords

Doped fullerenes
Fullerenes
Nuclear magnetic resonance (NMR)

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

Access to Document

10.1016/S0921-4526(02)01708-8

Cite this

@article{a747904368cc45148acb3b40b16be9e7,

title = "Solid state 19F NMR study of acceptor-doped fullerenes (MF6)2C60 (M = As, Sb)",

abstract = "We report on temperature-dependent 19F NMR measurements of solid C60 intercalated with AsF5 and SbF5 acceptor species. Structure, molecular dynamics and possible phase transitions in the compounds are studied. The temperature dependence of the second moment, S2, of (AsF6)2C60 is typical for activation of molecular mobility on heating. The reorientation of the (AsF6)- complex is random and lasts at least down to 67K. The temperature dependence of S2 for (SbF6)2C60 showing significant change in the range of 200-270K is discussed. Further narrowing of the 19F spectra of (SbF6)2C60 on heating occurs around 320K. 19F spectra at 7.04T resolve two resonances corresponding to different fluorine species. Suggesting that these species randomly occupy two different interstitial sites, we give reasons for the absence of superconductivity down to 5K in the compounds under study.",

keywords = "Doped fullerenes, Fullerenes, Nuclear magnetic resonance (NMR)",

author = "Panich, {A. M.} and Vieth, {H. M.} and Ummat, {P. K.} and Datars, {W. R.}",

note = "Funding Information: The research in Canada was supported financially by the Natural Sciences and Engineering Research Council of Canada. The research in Israel was supported financially by the Ben-Gurion University Seed Grant. One of us (AMP) thanks E. Katz for helpful discussion. ",

year = "2003",

month = mar,

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doi = "10.1016/S0921-4526(02)01708-8",

language = "English",

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T1 - Solid state 19F NMR study of acceptor-doped fullerenes (MF6)2C60 (M = As, Sb)

AU - Panich, A. M.

AU - Vieth, H. M.

AU - Ummat, P. K.

AU - Datars, W. R.

N1 - Funding Information: The research in Canada was supported financially by the Natural Sciences and Engineering Research Council of Canada. The research in Israel was supported financially by the Ben-Gurion University Seed Grant. One of us (AMP) thanks E. Katz for helpful discussion.

PY - 2003/3/1

Y1 - 2003/3/1

N2 - We report on temperature-dependent 19F NMR measurements of solid C60 intercalated with AsF5 and SbF5 acceptor species. Structure, molecular dynamics and possible phase transitions in the compounds are studied. The temperature dependence of the second moment, S2, of (AsF6)2C60 is typical for activation of molecular mobility on heating. The reorientation of the (AsF6)- complex is random and lasts at least down to 67K. The temperature dependence of S2 for (SbF6)2C60 showing significant change in the range of 200-270K is discussed. Further narrowing of the 19F spectra of (SbF6)2C60 on heating occurs around 320K. 19F spectra at 7.04T resolve two resonances corresponding to different fluorine species. Suggesting that these species randomly occupy two different interstitial sites, we give reasons for the absence of superconductivity down to 5K in the compounds under study.

AB - We report on temperature-dependent 19F NMR measurements of solid C60 intercalated with AsF5 and SbF5 acceptor species. Structure, molecular dynamics and possible phase transitions in the compounds are studied. The temperature dependence of the second moment, S2, of (AsF6)2C60 is typical for activation of molecular mobility on heating. The reorientation of the (AsF6)- complex is random and lasts at least down to 67K. The temperature dependence of S2 for (SbF6)2C60 showing significant change in the range of 200-270K is discussed. Further narrowing of the 19F spectra of (SbF6)2C60 on heating occurs around 320K. 19F spectra at 7.04T resolve two resonances corresponding to different fluorine species. Suggesting that these species randomly occupy two different interstitial sites, we give reasons for the absence of superconductivity down to 5K in the compounds under study.

KW - Doped fullerenes

KW - Fullerenes

KW - Nuclear magnetic resonance (NMR)

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DO - 10.1016/S0921-4526(02)01708-8

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