Journal
ACTA CRYSTALLOGRAPHICA SECTION B-STRUCTURAL SCIENCE
Volume 61, Issue -, Pages 724-730Publisher
BLACKWELL PUBLISHING
DOI: 10.1107/S0108768105030077
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- Engineering and Physical Sciences Research Council [GR/S57679/01] Funding Source: researchfish
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Pyridine-3,5-dicarboxylic acid has been studied by single-crystal neutron diffraction at 15 and 296 K. Pyridine-3,5-dicarboxylic acid, in which the carboxylic acid protons have been replaced by deuterons, has also been studied at 15, 150 and 296 K. The protonated structure contains a short N center dot center dot center dot H center dot center dot center dot O hydrogen bond [N center dot center dot center dot O 2.523 (2) angstrom at 15 K]. Temperature-dependent proton migration occurs where the N-H distance in the hydrogen bond changes from 1.213 (4) angstrom at 15 K to 1.308 (6) A at 300 K. In the deuterated structure the overall hydrogen-bond length increased [N center dot center dot center dot O 2.538 (3) angstrom at 15 K] and the magnitude of the migration increased so that the N-D distance changes from 1.151 (3) angstrom at 15 K to 1.457 (4) angstrom at 300 K.
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