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Saturated vapor pressure and sublimation enthalpy of C60F 18

✍ Scribed by Guido Gigli; ; Giovanni Balducci; ; Vitaliy Yu. Markov; ; Olga V. Boltalina; ; Alexey A. Goryunkov; ; Lev N. Sidorov; ; Roger Taylor

Publisher
Elsevier Science
Year
2002
Tongue
English
Weight
80 KB
Volume
34
Category
Article
ISSN
0021-9614

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✦ Synopsis

The Knudsen effusion-mass loss method was used to determine the saturated vapor pressure and molar enthalpy of sublimation for C 60 F 18 , fluorofullerene. The average molar mass of the effusing vapor was checked by an independent torsion effusionmass loss experiment. The vapor pressure against temperature dependence is described by the equation ln( p/Pa) = -(23739 Β± 1234) β€’ (K/T ) + (33.23 Β± 1.97) in the temperature range (591 to 671) K. The anomalously high value of the sublimation enthalpy of C 60 F 18 { sub H o m (627 K) = (197 Β± 10) kJ β€’ mol -1 } compared with the values found for the parent fullerene C 60 and the other fluorofullerenes C 60 F 48 and C 60 F 36 so far studied, may be explained by the high polarity of the C 60 F 18 molecule.

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