Dielectric and Sorption Responses of Hydrogen-Bonding Network of Amorphous C₆₀(OH)₁₂ and C₆₀(OH)₃₆

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Hydrophilic fullerene derivatives of C 60 (OH) 12 ( 1 ) and C 60 (OH) 36 ( 2 ) bearing different numbers of −OH groups formed amorphous solids of 1 · x (H 2 O) ( x = 5–10) and 2 · x (H 2 O) ( x = 15–22), respectively, according to the humidity. The thermally activated dynamic molecular motion of polar H 2 O 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 N 2, CO 2, H 2, and CH 4 gases vapors and polar H 2 O, MeOH, and EtOH molecules reversibly adsorbed into the networks. The molecular motion of polar H 2 O 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 m 2 g –1, respectively, from the CO 2 sorption isotherms. Reversible vapor sorption behaviors with structural changes of amorphous 1 and 2 were also confirmed for the polar H 2 O, MeOH, and EtOH.