Ethyl [(2-hydroxyphenyl)(pyridinium-2-ylamino)methyl]phosphonate methanol solvate

In the title compound, C14H17N2O4P·CH3OH, the planes of the pyridinium-2-ylamino and 2-hydroxyphenyl groups form a dihedral angle of 75.6 (1)°, with the pyridinium NH group and the 2-hydroxyphenyl OH group pointing in opposite directions. Three intramolecular hydrogen bonds are observed. Two phosphonate and two methanol molecules are connected by O—H...O hydrogen bonds as a centrosymmetric dimeric cluster, and interact further with other dimeric clusters via N—H...O, O—H...O and C—H...O hydrogen bonds and C—H...π interactions, resulting in a sheet structure.