Abstract
‘Carbon’ formation, in the temperature range 600–1200 K, by thermal decomposition of sulphanilic acid has been studied using electron spin resonance and X-ray photoelectron spectroscopy supported by chemical investigations. Evidence is put forward which suggests that these ‘carbons’ are a class of disordered free radical solids formed by cross-linking of tetra-azadibenzanthracene structural units and also containing heterocyclic sulphur.

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