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Azafullerene C_(59)N, a stable free radical substituent in crystalline C_(60)

Solid solutions of C_(59)N azafullerene in C_(60) with concentrations of 10^(-5) to 10^(-4) were produced in large quantities in an electric gas discharge tube. C_(59)N is a stable monomeric substituent molecule in crystalline C_(60) The isotropic N-14 and C-13 hyperfine coupling constants measured by electron spin resonance (ESR) are characteristic of the extent of delocalization of the charge over the cage and are a sensitive test of electronic structure calculations. The C_(59)N reorientational activation energy measured below the face centered cubic (fcc) to simple cubic (sc) transition is 2300 K. This value is similar to that of the matrix C_(60) molecules, indicating that C_(59)N-C_(60) intermolecular interactions are weak.

C_(59)N; C_(60); Solid solution; Azafullerene; Reorientational activation energy; Intermolecular interactions

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