Synthesis, crystal structure and Hirshfeld surface analysis of 3-(4-fluorophenyl)-2-formyl-7-methylimidazo[ 1,2-a]pyridin-1-ium chloride monohydrate.

In the title salt, C15H12FN2O+•Cl-H2O, the imidazo[1,2-a]pyridin-1-ium ring system of the cation is almostly planar [maximum deviaition = -0.047 (2) Å for the ring C atom with the attached arene ring] and forms a dihedral angle of 61.81 (6)° with the plane of the fluorophenyl ring. In the crystal, water molecules form an R24(8) motif parallel to the (100) plane by bonding with the chloride ions via O--H• • •Cl hydrogen bonds. The cations are connected along the b axis via N--H• • •O hydrogen bonds involving the O atoms of water molecules, and C--H• • •O, C--H• • •Cl and π--π interactions [centroid-to-centroid distance = 3.6195 (8) Å] form layers parallel to the (100) plane. Furthermore, these layers are connected via π--π interactions [centroid-to-centroid distance = 3.8051 (9) Å] that further consolidate the crystal structure. [ABSTRACT FROM AUTHOR]