Inter­molecular hydrogen bonding in N-methyl-N′-(pyridin-2-yl)benzene-1,2-di­amine

The structure of N-methyl-N′-(pyridin-2-yl)benzene-1,2-di­amine, C12H13N3, at 123 K has ortho­rhom­bic (Pna21) symmetry. The title compound displays an unexpected proton-splitting pattern when studied by 1H NMR spectroscopy. The X-ray crystallography analysis determined this to be caused by strong dual N—H⋯N hydrogen bonding.