1.
Acta Crystallogr Sect E Struct Rep Online
; 70(Pt 11): o1221-2, 2014 Nov 01.
Article
in English
| MEDLINE
| ID: mdl-25484840
ABSTRACT
In the crystal of the title hydrated salt, C6H7N4 (+)·C4H5O6 (-)·0.5H2O, the bi-imidazole monocation, 1H,1'H-[2,2'-biimidazol]-3-ium, is hydrogen bonded, via N-Hâ¯O, O-Hâ¯O and O-Hâ¯N hydrogen bonds, to the hydrogen tartrate anion and the water mol-ecule, which is located on a twofold rotation axis, forming sheets parallel to (001). The sheets are linked via C-Hâ¯O hydrogen bonds, forming a three-dimensional structure. There are also C=Oâ¯π inter-actions present [Oâ¯π distances are 3.00â (9) and 3.21â (7)â Å], involving the carbonyl O atoms and the imidazolium ring, which may help to consolidate the structure. In the cation, the dihedral angle between the rings is 11.6â (2)°.