Solid-State NMR Studies of Fullerene C₆₀/Benzene Solvates

Abstract

Stable van der Waals-bonded C 60 /benzene solvates were prepared using a novel crystallization technique. Solid-state NMR measurements on highly crystalline solvate under liquid benzene show that there is very little interaction between benzene and the C 60 molecules and that the rotation of C 60 at room temperature is not hindered. The magnetization transfer between benzene protons and local C 60 molecules is highly inefficient. Three benzene species have been found in the solvate: two, nearly freely mobile, in wide and narrow porous structures, and the third constrained by C 60 molecules in lattice defects. Premelting of deuterated benzene within the C 60 solvate has been observed at T m -10.5 K.

Preparation and gas permeation of immobilized fullerene membranes

“…Pure crystalline fullerene is known to show a molecular rotor, 14 having a diameter of 7 angstroms at room temperature, and fullerene readily forms solid solvates with several host solvents such as n-pentane, 15 hexane, 14,16 ndecane, 17 and benzene. 14 These intrinsic characteristics of fullerene prompted us to prepare homogeneous fullerene-dispersed polymeric membranes (i.e., fullerene/polymer blend membranes), and to investigate gas permeation through the fullerene membranes where the fullerene is spinning as a molecular rotor and solvates with penetrant gases.…”

“…14 These intrinsic characteristics of fullerene prompted us to prepare homogeneous fullerene-dispersed polymeric membranes (i.e., fullerene/polymer blend membranes), and to investigate gas permeation through the fullerene membranes where the fullerene is spinning as a molecular rotor and solvates with penetrant gases.…”

Synthesis and solid-state studies of self-assembled C60 microtubes

“…Crystallization from solutions usually produces C 60 solvated structures [9][10][11][12]. It has been found that C 60 nanorods fabricated from solutions of C 60 in m-xylene have a single-crystalline C 60 *1m-xylene solvated structure [7].…”

Gas permeation of fullerene-dispersed poly(1-trimethylsilyl-1-propyne) membranes

“…8 -12 Pure crystalline fullerene is known to show a molecular rotor 13 having a diameter of 7 angstroms at room temperature, and fullerene readily forms solid solvates with several host solvents such as n-pentane, 14 hexane, 13,15 ndecane, 16 and benzene. 13 These intrinsic characteristics of fullerene prompted us to prepare homogeneous fullerene-dispersed polymeric membranes (i.e., fullerene/polymer blend membranes) and to investigate gas permeation through the fullerene membranes where the fullerene is spinning as a molecular rotor and forms solvates with penetrant gases.…”