Salts of 4-[(benzylamino)carbonyl]-1-methylpyridinium and iodide anions with different cation:iodine stoichiometric ratios

The two iodide salts, 4-[(benzylamino)carbonyl]-1-methylpyridinium iodide–iodine (2/1), C 14 H 15 N 2 O + ·I − ·0.5I 2 , I , and 4-[(benzylamino)carbonyl]-1-methylpyridinium triiodide, C 14 H 15 N 2 O + ·I 3 − , II , with different cation:iodine atoms ratios were studied. Salt I contains one cation, one iodide anion and half of the neutral I 2 molecule in the asymmetric unit (cation:iodine atoms ratio is 1:2). Salt II contains two cations, one triiodide anion (I 3 − ) and two half triiodide anions (cation:iodine atoms ratio is 1:3). The NH group forms N—H...I hydrogen bonds with the I − anion in the crystal of I or N—H...O hydrogen bonds in II where only triiodide anions are present.