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The rotational energy curves for the model compounds formaldazine, H<jats:sub>2<\/jats:sub>C = N\uf8ffN = CH<jats:sub>2<\/jats:sub>, ethenyl diazene, H<jats:sub>2<\/jats:sub>C = CH\uf8ffN = NH, and ethanediimine, HN = CH\uf8ffCH = NH were calculated for a variety of basis sets at the HF and MP2 level. In all of these cases the rotational energy barriers are quite different from butadienes or aza\u2010substituted butadienes because of the lone pair\u2013lone pair interaction of the adjacent nitrogen atoms. The results on the model compounds were used to generate a set of molecular mechanics (MM) parameters that are appropriate for linear oligo\u2010 and polyazines. 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