ISSN:
1600-5759
Source:
Crystallography Journals Online : IUCR Backfile Archive 1948-2001
Topics:
Chemistry and Pharmacology
,
Geosciences
,
Physics
Notes:
In this modification of the title compound, 5-{4-[(2-pyridylamino)sulfonyl]phenyldiazenyl}salicylic acid, C18H14N4O5S, the molecule is present in the amide tautomeric form. Two azo-bridged phenyl rings render the bulk of the molecule planar, with the carboxylic acid group at one terminal and the pyridylamino residue at the other. The repeating unit in the crystal is a centrosymmetric dimer containing two identical R_2^2(8) hydrogen-bonded ring systems, each involving the carboxylic acid and pyridylamino moieties. Additional stabilization is due to an intramolecular hydrogen bond between the 2-hydroxyl group and the carbonyl O atom of the carboxylic acid group, as well as intermolecular π–π stacking.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1107/S0108270100020771
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