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International Union of Crystallography, Acta Crystallographica Section E: Structure Reports Online, 5(64), p. o826-o826, 2008

DOI: 10.1107/s1600536808009045

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Pyromellitic acid–sarcosine (1/2)

Journal article published in 2008 by Sérgio R. Domingos, Manuela Ramos Silva, Nuno D. Martins, Ana Matos Beja, Ana Matos Beja, J. A. Paixão ORCID
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

The title compound, C(10)H(6)O(8)·2C(3)H(7)NO(2), crystallizes as an adduct with the acid and amino acid mol-ecules in their neutral forms. The asymmetric unit contains one half of a centrosymmetric pyromellitic acid mol-ecule and one sarcosine mol-ecule. The sarcosine has the amine group protonated and the carboxyl group deprotonated, as is usual for amino acids (zwitterionic form). The pyromellitic acid mol-ecules 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 mol-ecules.