Acta Cryst. (2012). E68, o211 [ doi:10.1107/S1600536811053219 ]
Abstract: In the title molecule, C28H18O10, the two central benzene rings form a dihedral angle of 31.0 (1)°. In the phthalic acid fragments, the carboxy groups in the meta positions are approximately coplanar with the attached benzene rings, being inclined to their planes at 2.7 (1) and 10.3 (1)°, while the carboxy groups in the ortho positions are twisted from the benzene ring planes by 83.5 (1) and 75.4 (1)°. In the crystal, O-H
O hydrogen bonds link the molecules into layers parallel to the bc plane. Weak C-HO hydrogen bonds and ![[pi]](/logos/entities/pi_rmgif.gif)
- interactions between the aromatic rings [centroid-centroid distance = 3.7674 (3) Å] further consolidate the crystal packing.
 |   Hyper-Text Markup Language (HTML) file (77.2 kbytes) |
 | Chemical Markup Language (CML) file (8.5 kbytes) |
To open or display or play some files, you may need to set your browser up to use the appropriate software. See the full list of file types for an explanation of the different file types and their related mime types and, where available links to sites from where the appropriate software may be obtained.
The download button will force most browsers to prompt for a file name to store the data on your hard disk.
Where possible, images are represented by thumbnails.
Copyright © International Union of Crystallography
IUCr Webmaster