Acta Cryst. (2009). C65, o58-o61 [ doi:10.1107/S0108270108044132 ]
Abstract: Both maleic and fumaric acid readily form adducts or complexes with other organic molecules. The 1:1 adduct formed by quinolin-8-ol (oxine) with maleic and fumaric acid are salts, namely 8-hydroxyquinolinium hydrogen maleate, C9H8NO+·C4H3O4-, (I)
O- hydrogen bonds. The maleate salt crystallizes in the space group P212121, while the fumarate salt crystallizes in P
. The maleic and fumaric acids in their complex forms exist as semimaleate and semifumarate ions (mono-ionized state), respectively. Classical N-HO and O-HO hydrogen bonds, together with short C-HO contacts, generate an extensive hydrogen-bonding network. The crystal structures of the maleate and fumarate salts of oxine have been elucidated to study the importance of noncovalent interactions in the aggregation and interaction patterns of biological molecules. The structures of the salts of the Z and E isomers of butenedioic acid (maleic and fumaric acid, respectively) with quinolin-8-ol are compared.
Formula: C9H8NO+·C4H3O4- and C9H8NO+·C4H3O4-
 |   Structure factor file (CIF format) (85.1 kbytes) |
| Structure factor file (CIF format) (213.0 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