Guanidinium 4-amino-benzoate

P S Pereira Silva; M Ramos Silva; J A Paixão; A Matos Beja

doi:10.1107/S160053681000396X

Guanidinium 4-amino-benzoate

Acta Crystallogr Sect E Struct Rep Online. 2010 Feb 6;66(Pt 3):o524. doi: 10.1107/S160053681000396X.

Authors

P S Pereira Silva¹, M Ramos Silva, J A Paixão, A Matos Beja

Affiliation

¹ CEMDRX, Physics Department, University of Coimbra, P-3004-516 Coimbra, Portugal.

Abstract

In the title compound, CH(6)N(3) (+)·C(7)H(6)NO(2) (-), the cation and anion lie on crystallographic mirror planes. The 4-amino-benzoate anion is almost in a planar conformation with a maximum deviation of 0.024 (2) Å for the N atom. The bond length in the deprotonated carboxyl group is inter-mediate between those of normal single and double Csp(2)=O bonds, indicating delocalization of the charge over both O atoms of the COO(-) group. In the crystal, N-H⋯O hydrogen bonds assemble the ions in layers propagating in the bc plane. This structure is very similar to that of guanidinium benzoate.