The electron resonance spectrum of the mono-anion of tricyano-symtriazine, at 25°c and below, reveals the presence, not of two sets of three equivalent nitrogen atoms, but a set of two and another set of four. It is suggested that the radical-ion undergoes a permanent Jahn-Teller distortion to one of three equivalent distorted forms.
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Carrington et al. (1965) studied this question.
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