title: Xanthene-9-carboxylic acid.
abstract: In xanthene-9-carboxylic acid, C14H10O3, hydrogen bonding is of the cyclic dimer type but involves two crystallographically inequivalent molecules and does not occur about a center of symmetry. The carboxylic H atoms are ordered. The dihedral angle (fold angle) of the xanthene core is 14.2 (1) degree for molecule A and 11.3 (2) degrees for molecule B. The planes of the carboxyl groups are almost perpendicular to the xanthene cores.
authors.affiliation: Department of Chemistry, Ohio State University, Columbus 43210, USA.
authors.forename: A C
authors.initials: AC
authors.lastname: Blackburn
authors.forename: A J
authors.initials: AJ
authors.lastname: Dobson
authors.forename: R E
authors.initials: RE
authors.lastname: Gerkin
mesh_terms: D018360:Crystallography, X-Ray; D006860:Hydrogen Bonding; D046911:Macromolecular Substances; D008958:Models, Molecular; D015394:Molecular Structure; D014966:Xanthenes / Q000737:chemistry*
chemical_list: D046911:Macromolecular Substances; D014966:Xanthenes; C036983:xanthene-9-carboxylic acid