Production and characterization of monomeric $C59N:$ A magnetic modification of fullerene

Solid solutions of $C59N$ azafullerene in $C60$ with concentrations up to $10−4$ were produced in an electric gas discharge tube and by a heat treatment of $(C59N)2$ dissolved in pure $C60.$ The results on materials produced by the two methods are identical. $C59N$ is a stable monomeric substituent molecule in crystalline $C60$ and may be heated to temperatures as high as 1300 K. The concentration of ESR active neutral $C59N$ molecules at ambient temperatures depends on temperature history.