TY  - JOUR
A1  - Ton, Quoc-Cuong
A1  - Bolte, Michael
T1  - Intra- and intermolecular proton transfer in 2,6-diaminopyridinium 4-hydroxypyridin-1-ium-2,6-dicarboxylate
T2  - Acta crystallographica / Section E, Structure reports online
N2  - Chelidamic acid (4-hydroxypyridine-2,6-dicarboxylic acid) and 2,6-diaminopyridine react to form the title salt, C5H8N3+·C7H4NO5-; there are two formula units in the asymmetric unit. The pyridine N atom of 2,6-diaminopyridine is protonated whereas chelidamic acid is deprotonated at both carboxylate groups but protonated at the N atom; the reaction involves intra- and intermolecular proton transfer. In the crystal, each 2,6-diaminopyridinium cation participates in five strong N-H...O hydrogen bonds (including one bifurcated hydrogen bond). The crystal structure also features strong O-H...O hydrogen bonds between the chelidamate anions, leading to chains along the a axis.
Y1  - 2012
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/27428
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-274287
SN  - 1600-5368
VL  - 68
IS  - o2860-2861
PB  - Munksgaard
CY  - Copenhagen
ER  -