The molecules C₂₈, C₂₈@C, C₂₈@Zr and C₂₈@Ti have been studied in an ab initio density functional calculation (M. Pederson et. al, Phys. Rev. B 48, 2733 (1993).

The TDAE-C60 has attracted much interest, because of its transition to a state of ferromagnetic-like charactar at a temperature which is unusally high for organic systems. The properties of the TDAE molecule were studied in an ab initio density functional calculation, and some of the consequences for TDAE-C60 were discussed (M. Pederson, N. Laouini, J. Cluster Sci. 10, 557 (1999)).