Synthesis of New Type Graphite Intercalation Compounds with Ferric Chloride in Chloroform

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Abstract
New type of ferric chloride-graphite intercalation compounds, which was characterized by new intercalate thickness d1 and new powder pattern of X-ray, was synthesized in chloroform solution. In the beginning of the reaction between graphite powder (average particle size of 400μm) and ferric chloride in chloroform, graphite intercalation com-pounds (GlCs) with d1-value of 9.4Å were formed, being the same in d1-value and X-ray powder pattern as those synthesized by vapor method and also in organic solutions and so being called as type I compounds in the present paper. By continuation of reaction in chloroform, the type I compounds thus formed were found to convert to new type G1Cs, of which d1-value was supposed to be 11.8Å, much larger than that for the type I compounds, and X-ray powder pattern showed relatively strong two peaks around 26° in 2θ, different from that of the type I compound. The conversion from the type I to type II GlCs was found to occur when the weight ratio of FeCl3 to graphite was less than 2 and FeCl3 in 100 ml of CHCl3 was less than 2g. The identity period values observed, 21.8, 25.3, 28.6, 31.9 and 45.3Å, could be explained by stage change.

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