Pyromellitic acid-sarcosine (1/2)

• Autor(a) principal: Domingos, S. R.
• Data de Publicação: 2008
• Outros Autores: Silva, Manuela Ramos, Martins, Nuno D., Beja, Ana Matos, Paixão, J. A.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
• Texto Completo: https://hdl.handle.net/10316/110434; https://doi.org/10.1107/S1600536808009045
• topic: single-crystal X-ray study; T = 293 K; mean (C–C) = 0.002 A°; R factor = 0.042; wR factor = 0.115; data-to-parameter ratio = 14.2

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.