1-{2-[(2-hydroxybenzylidene)-amino]-ethyl}-3-methyl-3H-imidazolium hexafluorophosphate

The title Schiff base compound, C(13)H(16)N(3)O(+)·PF(6) (-), was derived from the condensation of 2-hydroxy-benaldehyde with the ionic liquid 1-(2-amino-ethyl)-3-methyl-imidazolium hexa-fluoro-phosphate in an ethanol solution. The asymmetric unit comprises one cation and two PF(6) (-) anions. The dihedral angle between the aromatic and imidazole rings is 15.2 (2)°. An intra-molecular O-H⋯N hydrogen bond is found which generates an S(6) ring motif.