Positron lifetime in supramolecular gamma- and delta-cyclodextrin- C60 and - C70 compounds

K. Süvegh, K. Fujiwara, K. Komatsu, T. Marek, T. Ueda, A. Vértes, T. Braun

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Temperature dependence of positron lifetime parameters have been studied in pure cyclodextrins and their supramolecular complexes with C60 and C70 molecules. It was found that while C60 molecules are localized in molecular cavities in gamma-cyclodextrin, they are too small to be trapped by the larger cavities of delta-cyclodextrin. On the other hand, the larger C70 molecules fill these larger voids completely. In cases where fullerene molecules are localized in molecular cavities, a low-temperature phase transition was observed. The activation energies for the phase transitions were calculated assuming a simple two-state annihilation model.

Original languageEnglish
Pages (from-to)263-269
Number of pages7
JournalChemical Physics Letters
Volume344
Issue number3-4
DOIs
Publication statusPublished - Aug 24 2001

Fingerprint

Positrons
positrons
life (durability)
Molecules
cavities
molecules
Phase transitions
Fullerenes
Cyclodextrins
fullerenes
voids
Activation energy
activation energy
Temperature
temperature dependence
gamma-cyclodextrin
delta-cyclodextrin

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Spectroscopy
  • Atomic and Molecular Physics, and Optics

Cite this

Positron lifetime in supramolecular gamma- and delta-cyclodextrin- C60 and - C70 compounds. / Süvegh, K.; Fujiwara, K.; Komatsu, K.; Marek, T.; Ueda, T.; Vértes, A.; Braun, T.

In: Chemical Physics Letters, Vol. 344, No. 3-4, 24.08.2001, p. 263-269.

Research output: Contribution to journalArticle

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