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Investigations of N@C60 and N@C70 stability under high pressure and high temperature conditions
Umeå University, Faculty of Science and Technology, Department of Physics.
2009 (English)In: Physica Status Solidi B vol. 246, issue 11-12: Proceedings of the International Winterschool on Electronic Properties of Novel Materials 2009 (IWEPNM 2009), Kirchberg, March 2009. / [ed] Christian Thomsen, Peter Dinse, Hans Kuzmany, Stephanie Reich, and Siegmar Roth, 2009, 2767-2770 p.Conference paper (Refereed)
Abstract [en]

Endohedral fullerenes encapsulating single nitrogen atoms (N@C60 and N@C70) are spin active, due to the presence of unpaired nitrogen electron spins. High reactivity of nitrogen leads to a poor stability of these molecules at elevated temperatures, drastically restricting possibilities of their chemical treatment. In this study, N@C60 and N@C70 in toluene solutions were subjected to high pressure (HP) up to 0.8 GPa and annealed for 1, 2, 10 or 24 h, at either room or elevated temperatures. In each case the number of surviving molecules was evaluated based on the relative spin counts of ex situ EPR spectra obtained before and after the treatment. The enhanced thermal stability of N@C60 and N@C70 under HP conditions is attributed to inhibited formation of azabridges, which under normal pressure facilitate the escape of nitrogen from the fullerene cage.

Place, publisher, year, edition, pages
2009. 2767-2770 p.
, Physica Status Solidi B, ISSN 0370-1972 ; Volume 246 issue 11-12
Keyword [en]
Fullerenes, endohedral fullerenes, C60, C70, N@C60, N@C70, high pressure, fullerene solution, molecular stability
National Category
Condensed Matter Physics
Research subject
URN: urn:nbn:se:umu:diva-30559DOI: 10.1002/pssb.200982270OAI: diva2:284724
International Winterschool on Electronic Properties of Novel Materials (IWEPNM) 2009
Available from: 2010-01-08 Created: 2010-01-08 Last updated: 2015-09-28Bibliographically approved

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Iwasiewicz-Wabnig, AgnieszkaSundqvist, Bertil
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