A. Sygula et Pw. Rabideau, CONVEX VS CONCAVE PI-FACIAL BINDING OF METAL-CATIONS TO A SEMIBUCKMINSTERFULLERENE - AN AB-INITIO STUDY, Journal of the Chemical Society, Chemical Communications, (19), 1994, pp. 2271-2272
In contrast with both MNDO and PM3 semiempirical calculations that pre
dict preferential binding of a number of metal cations to the convex f
ace of triindenotriphenylene, ab initio calculations suggest modest to
strong preference for the concave side in six of seven cases studied.