title: Crystal structure of 3-ethynyl-benzoic acid.
abstract: In the title compound, C9H6O2, the carb-oxy-lic acid group is almost in the plane of the benzene ring, making a dihedral angle of 2.49 (18)°. In the crystal, mol-ecules are linked by pairs of O-H⋯O hydrogen bonds, forming classical acid-acid inversion dimers, with an R 2 (2)(8) ring motif. The dimers are linked by pairs of C-H⋯O hydrogen bonds forming chains, enclosing R 2 (2)(16) ring motifs, propagating along the c-axis direction.
authors.affiliation: CEMES-CNRS BP 94347, 29 Rue J. Marvig, 31055 Toulouse, France.
authors.forename: Chiara
authors.initials: C
authors.lastname: Venturini
authors.affiliation: CEMES-CNRS BP 94347, 29 Rue J. Marvig, 31055 Toulouse, France.
authors.forename: Nicolas
authors.initials: N
authors.lastname: Ratel-Ramond
authors.affiliation: CEMES-CNRS BP 94347, 29 Rue J. Marvig, 31055 Toulouse, France.
authors.forename: Andre
authors.initials: A
authors.lastname: Gourdon
keywords: 3-ethynyl­benzoic acid; crystal structure; hydrogen bonding