Citation: Ling ZHU, Han Yao LIANG, Su Nian CHEN, Rong Sheng SHENG. CHROMATOGRAPHIC SEPARATION ON GRAPHITE OF FULLERENE-C₆₀ AND-C₇₀[J]. Chinese Chemical Letters, ;1993, 4(3): 229-232. shu

CHROMATOGRAPHIC SEPARATION ON GRAPHITE OF FULLERENE-C₆₀ AND-C₇₀

Department of Modern Analytical Science Wuhan University, Wuhan, 430072

Received Date: 20 July 1992

The mixture of fullerene—C₆₀ and —C₇₀ was successfully separated in larger amount by liquid chromatography on graphite column.The column was first eluted with a mixture of hexane and toluene,and then with toluene.The eluates were monitored by UV/visible absorption spectroscopy.Graphite column shows high performance for separation.and much larger quantities of pure C₆₀ can be easily obtained.The synthesis of fullerenes(C₆₀ and C₇₀)in macroscopic quantities^[1,2] has stimulated scientists to study on themethod for separating C₆₀ and C₇₀.Because of the poor solubility of fullerenes C₆₀/C₇₀ in most organic solvents,theseparation of C₆₀ and C₇₀ proved to be a challenging task.Most attempts at the separation have used silica and alu-mina as the stationary phase and a mixture of hexane and benzene(or toluene)as the mobile phase^[3,5].Fullerenes,however,have only limited solubility in hexane,these separations are usually only achieved by limit-ing the amount of sample to a few milligrams.The hexane-silica technique using phenylglycine based HPLCcolumns appears to offer good separation^[6],but only for submilligram amounts. The use of graphite powder as the stationary phase in liquid chromatography is an advanced separation tech-nique for fullerenes C₆₀/C₇₀^[7,8].The technique is based on that the fullerene-C₆₀ is different from C₆₀ in the de-gree of electron delocalisation,and C₆₀ is much less diamagnetic than C₇₀.It is expected that the dissimilarity willcause the C₆₀/C₇₀ molecules to exhibit different interactions with graphite,and can be separated from each other onthis basis.
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