Acta Cryst. (2008). E64, o826  [ doi:10.1107/S1600536808009045 ]

Pyromellitic acid-sarcosine (1/2)

S. R. Domingos, M. Ramos Silva, N. D. Martins, A. Matos Beja and J. A. Paixão

Abstract: The title compound, C₁₀H₆O₈·2C₃H₇NO₂, crystallizes as an adduct with the acid and amino acid molecules in their neutral forms. The asymmetric unit contains one half of a centrosymmetric pyromellitic acid molecule and one sarcosine molecule. The sarcosine has the amine group protonated and the carboxyl group deprotonated, as is usual for amino acids (zwitterionic form). The pyromellitic acid molecules retain the four carboxyl H atoms with the carboxyl groups rotated out of the ring plane [O-C-C-C torsion angles = 24.1 (3) and 61.6 (2)°]. There is a three-dimensional hydrogen-bond network linking the molecules.

Online 10 April 2008

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