ESR Signal in Azafullerene (C59N)2 Induced by Thermal Homolysis

F. Simon, Denis Arčon, Nikos Tagmatarchis, Slaven Garaj, Laszlo Forro, Kosmas Prassides

Research output: Contribution to journalArticle

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Abstract

Thermal homolysis of biazafullerenyl, (C59N)2, has been studied by CW ESR in the temperature range 290-829 K. The room-temperature ESR spectrum consists of a single sharp narrow line whose intensity is consistent with the presence of a low concentration of defect spins (1 spin per 600 C59N units). Around 500 K, three sharp lines emerge on top of the impurity signal and are assigned to the 14N(I = 1) hyperfine spectrum with a hyperfine coupling constant, aiso = 3.60(1) G and a g-factor of 2.0004(2). The intensity of the observed 14N hyperfine spectrum directly measures the fraction of the C59N radicals formed as the temperature increases, growing from ∼50 ppm at 516 K to ∼300 ppm at 740 K. The temperature evolution of this fraction allows us to extract an estimate of the binding energy as 7(1) kcal/mol. The high temperature treatment of the sample eventually results in the partial decomposition and formation of C60.

Original languageEnglish
Pages (from-to)6969-6971
Number of pages3
JournalJournal of Physical Chemistry A
Volume103
Issue number35
Publication statusPublished - Sep 2 1999

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Paramagnetic resonance
Temperature
temperature
low concentrations
binding energy
decomposition
impurities
Binding energy
defects
room temperature
estimates
Hot Temperature
Impurities
Decomposition
Defects

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Simon, F., Arčon, D., Tagmatarchis, N., Garaj, S., Forro, L., & Prassides, K. (1999). ESR Signal in Azafullerene (C59N)2 Induced by Thermal Homolysis. Journal of Physical Chemistry A, 103(35), 6969-6971.

ESR Signal in Azafullerene (C59N)2 Induced by Thermal Homolysis. / Simon, F.; Arčon, Denis; Tagmatarchis, Nikos; Garaj, Slaven; Forro, Laszlo; Prassides, Kosmas.

In: Journal of Physical Chemistry A, Vol. 103, No. 35, 02.09.1999, p. 6969-6971.

Research output: Contribution to journalArticle

Simon, F, Arčon, D, Tagmatarchis, N, Garaj, S, Forro, L & Prassides, K 1999, 'ESR Signal in Azafullerene (C59N)2 Induced by Thermal Homolysis', Journal of Physical Chemistry A, vol. 103, no. 35, pp. 6969-6971.
Simon F, Arčon D, Tagmatarchis N, Garaj S, Forro L, Prassides K. ESR Signal in Azafullerene (C59N)2 Induced by Thermal Homolysis. Journal of Physical Chemistry A. 1999 Sep 2;103(35):6969-6971.
Simon, F. ; Arčon, Denis ; Tagmatarchis, Nikos ; Garaj, Slaven ; Forro, Laszlo ; Prassides, Kosmas. / ESR Signal in Azafullerene (C59N)2 Induced by Thermal Homolysis. In: Journal of Physical Chemistry A. 1999 ; Vol. 103, No. 35. pp. 6969-6971.
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