Dielectric and Sorption Responses of Hydrogen-Bonding
Network of Amorphous C60(OH)12 and C60(OH)36
Posted on 2019-09-13 - 16:38
Hydrophilic
fullerene derivatives of C60(OH)12 (1) and C60(OH)36 (2) bearing different
numbers of −OH groups formed amorphous
solids of 1·x(H2O) (x = 5–10) and 2·x(H2O) (x = 15–22), respectively,
according to the humidity. The thermally activated dynamic molecular
motion of polar H2O was confirmed in the DSC and dielectric
spectra. Three-dimensional O–H···O hydrogen-bonding
networks in amorphous 1 and 2 produced extrinsic
adsorption–desorption pores with a hydrophilic environment
posed by −OH groups, where N2, CO2, H2, and CH4 gases vapors and polar H2O,
MeOH, and EtOH molecules reversibly adsorbed into the networks. The
molecular motion of polar H2O was directly observed in
dielectric enhancement and protonic conductivity in three-dimensional
O–H···O hydrogen-bonding networks. The Brunauer–Emmett–Teller
(BET) specific surface areas of amorphous 1 and 2 were 315 and 351 m2 g–1, respectively,
from the CO2 sorption isotherms. Reversible vapor sorption
behaviors with structural changes of amorphous 1 and 2 were also confirmed for the polar H2O, MeOH,
and EtOH.
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Uchikawa, Shota; Kawasaki, Ayumi; Hoshino, Norihisa; Takeda, Takashi; Noro, Shin-ichiro; Takahashi, Kiyonori; et al. (2019). Dielectric and Sorption Responses of Hydrogen-Bonding
Network of Amorphous C60(OH)12 and C60(OH)36. ACS Publications. Collection. https://doi.org/10.1021/acs.jpcc.9b06951