title: Pyromellitic acid-sarcosine (1/2).
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.
authors.affiliation: CEMDRX, Physics Department, University of Coimbra, P-3004-516 Coimbra, Portugal.
authors.forename: Sérgio R
authors.initials: SR
authors.lastname: Domingos
authors.forename: Manuela
authors.initials: M
authors.lastname: Ramos Silva
authors.forename: Nuno D
authors.initials: ND
authors.lastname: Martins
authors.forename: Ana
authors.initials: A
authors.lastname: Matos Beja
authors.forename: J A
authors.initials: JA
authors.lastname: Paixão