Crystal structure of 2,6-dimethylpyridinium hydrogen phthalate

A new crystal of 2,6-dimethylpyridinium hydrogen phthalate (DPMHP) has been prepared and characterized by x-ray crystallography. DPMHP crystallizes in the monoclinic space group C2/c with a = 26.105(3), b = 8.2250(10), c = 13 .8750(10) Angstrom, beta = 116.02(1)degrees, Ir = 2677.2(5) Angstrom(3), an d Z = 8. The 2,6-dimethylpyridinium (DPM) is held with the hydrogen phthala te ion (HPI) by intermolecular hydrogen bond of N - H---O. A noncentered hy drogen atom is involved in the short intramolecular hydrogen of O---O [2.39 8(2) Angstrom] between the neighboring carboxylic groups. The phenyl ring o f the HPI appears to be deformed in comparison with the original. The entit y of HPI in itself and DMPMHP as a whole are arranged in a rumple pattern. The geometrical arrangement in the crystal structure is characterized by th e formation of laminar ribbons of DPMHP.