ISSN:
1600-5759
Source:
Crystallography Journals Online : IUCR Backfile Archive 1948-2001
Topics:
Chemistry and Pharmacology
,
Geosciences
,
Physics
Notes:
Chelidamic acid, 4-hydroxypyridine-2,6-dicarboxylic acid, is found to be zwitterionic in its solid monohydrate form, C7H5NO5·H2O, with the aryloxide and one carboxylate group remaining protonated, but the other carboxylate group losing its proton to the pyridine N atom. In this, it is unlike its parent, dipicolinic acid (pyridine-2,6-dicarboxylic acid), which also crystallizes as a monohydrate, but one in which the acidic H atoms remain bound to the carboxylate groups. In both structures, the water molecule is a component of an extended hydrogen-bonded network.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1107/S0108270199015620
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