Xanthene-9-carboxylic acid.
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.
Blackburn
A C
AC
Department of Chemistry, Ohio State University, Columbus 43210, USA.
Dobson
A J
AJ
Gerkin
R E
RE
D018360:Crystallography, X-Ray; D006860:Hydrogen Bonding; D046911:Macromolecular Substances; D008958:Models, Molecular; D015394:Molecular Structure; D014966:Xanthenes / Q000737:chemistry*
D046911:Macromolecular Substances; D014966:Xanthenes; C036983:xanthene-9-carboxylic acid