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Prolonged treatment of C 60 in benzene with very high concentrations of N 2 O 4 leads to a new polynitro[60]fullerene whose composition was determined as C 60 (NO 2 ) 14 by thermogravimetric analysis. The compound is unstable and deflagrates above 170°C when heated under nitrogen or in air with the release of a considerable amount of heat as observed by the differential thermal analysis and as measured by differential scanning calorimetry. The decomposition steps of C 60 (NO 2 ) 14 were followed by the thermogravimetric analysis coupled with Fourier-transform infrared spectroscopy analytical technique. At the deflagration point C 60 (NO 2 ) 14 releases a mixture of nitrogen oxides: NO 2 and NO with minor amounts of N 2 O. The deflagration leaves a residue of oxidized carbon which by heating releases CO 2 and CO and at 700°C is reduced to a carbonaceous matter free from residual oxygenated groups showing also the presence of small amounts (⩽10%) of C 60 fullerene.