Abstract
Solid solutions of C 59N azafullerene in C 60 with concentrations of 10 −5 to 10 −4 were produced in large quantities in an electric gas discharge tube. C 59N is a stable monomeric substituent molecule in crystalline C 60. The isotropic 14N and 13C 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 59N 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 59N–C 60 intermolecular interactions are weak.
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