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Faculty Sponsor

Dr. Steven Stevenson

Sponsor Department/Program

Department of Chemistry

Student Department/Program

Department of Biology

University Affiliation

Indiana University – Purdue University Fort Wayne


Recently, we have demonstrated an ability to separate metallofullerenes from empty-cage fullerenes using Lewis Acid chemistry. However, there was poor selectivity among individual metallofullerenes with this approach. Precipitation of the entire metallofullerene family of compounds was due to not optimizing the precipitation threshold for these species. The use of AlCl3 as the Lewis Acid precipitated all metallofullerenes with a 1st oxidation potential < 0.7 V. In this presentation, we demonstrate that CuCl2 successfully decreases the precipitation threshold to less than 0.2 V. In this manner, most Gd metallofullerenes remain unreacted and in solution. The more reactive species precipitate and are readily separated from these “inert” Gd metallofullerenes. We have further decreased this precipitation threshold by exploring the use of “weaker” Lewis acids to achieve even better selectivity. Results indicate an improved selectivity toward individual metallofullerenes with these newly investigated Lewis acids. In this presentation, we report a variety of alternative Lewis acids and their feasibility of replacing CuCl2 and AlCl3.


Chemistry | Physical Sciences and Mathematics

Selective Precipitation of Gadolinium Metallofullerenes with Lewis Acids

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