title: 3-Acetoxy-2-(acetylamino)pyridinium-1-squarate.
abstract: The title compound, alternatively known as 3-acetoxy-2-(acetylamino)pyridinium betaine of squaric acid, C13H10N2O6, has been synthesized. The bond distances within the squarate ring indicate two possible resonance structures. The mean planes of the pyridinium and squarate systems are inclined at an angle of 24.0 (2) degrees with respect to one another due to a strong intramolecular hydrogen-bonding interaction between the amide NH group and a squarate O atom. In the extended structure, there are additional weak pi-pi and pi-ring interactions, which also stabilize the crystal structure.
authors.affiliation: Department of Physics, Faculty of Arts and Sciences, Ondokuz Mayis University, TR-55139 Kurupelit-Samsun, Turkey. iucar@omu.edu.tr
authors.forename: Ibrahim
authors.initials: I
authors.lastname: Uçar
authors.forename: Ahmet
authors.initials: A
authors.lastname: Bulut
authors.forename: Okan Zafer
authors.initials: OZ
authors.lastname: Yeşilel
authors.forename: Mustafa
authors.initials: M
authors.lastname: Odabaşoglu
authors.forename: Orhan
authors.initials: O
authors.lastname: Büyükgüngör