Patent ID: 7351284

Claim:
A method for producing fullerene crystals comprising: i) bringing a solution and a second solvent into contact with each other so that a liquid-liquid interface is formed therebetween, the solution including a first solvent containing a benzene derivative (A) whose content is at least 50 wt. % and fullerene dissolved in the first solvent, and the second solvent having a lower solubility of the fullerene than that of the first solvent; and ii) allowing the solution and the second solvent to be mixed together through counter diffusion of the solution and the second solvent to deposit crystals of the fullerene, wherein the benzene derivative (A) is at least one benzene derivative selected from the group consisting of a benzene derivative in which at least two hydrogen atoms of a benzene ring have been substituted, halogenated benzene, and alkoxybenzene.