title: Guanidinium 4-amino-benzoate.
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.
authors.affiliation: CEMDRX, Physics Department, University of Coimbra, P-3004-516 Coimbra, Portugal.
authors.forename: P S
authors.initials: PS
authors.lastname: Pereira Silva
authors.forename: M
authors.initials: M
authors.lastname: Ramos Silva
authors.forename: J A
authors.initials: JA
authors.lastname: Paixão
authors.forename: A
authors.initials: A
authors.lastname: Matos Beja