title: Can H2 inside C60 communicate with the outside world?
abstract: The quenching rate constants of singlet oxygen by C60, H2@C60, D2@C6o, H2, and D2 in solution were measured. The presence of a hydrogen (H2@C60) or deuterium (D2@C60) molecule inside the fullerene did not produce any observable effect based on triplet lifetime or EPR measurements. However, a remarkable effect was found for the 1O2 quenching by C60, H2@C60, D2@C6o, H2, and D2. Singlet oxygen was generated by photosensitization or by thermal decomposition of naphthalene endoperoxide derivatives. Comparison of the rate constants for quenching of 1O2 by H2@C60 and D2@C60 demonstrates a significant vibrational interaction between oxygen and H2 inside the fullerene. The quenching rate constant for H2 is 1 order of magnitude higher than that of D2, in agreement with the results observed for the quenching of 1O2 with H2@C60 or D2@C60.
authors.affiliation: Department of Chemistry, Columbia University, New York, New York 10027, USA.
authors.forename: Juan
authors.initials: J
authors.lastname: López-Gejo
authors.forename: Angel A
authors.initials: AA
authors.lastname: Martí
authors.forename: Marco
authors.initials: M
authors.lastname: Ruzzi
authors.forename: Steffen
authors.initials: S
authors.lastname: Jockusch
authors.forename: Koichi
authors.initials: K
authors.lastname: Komatsu
authors.forename: Fumiyuki
authors.initials: F
authors.lastname: Tanabe
authors.forename: Yasujiro
authors.initials: Y
authors.lastname: Murata
authors.forename: Nicholas J
authors.initials: NJ
authors.lastname: Turro