Pyridazine-3,6-dicarboxylic acid monohydrate
The title compound, C4H4N2O4·H2O, is a triclinic polymorphic form of pyridazine-3,6-dicarboxylic acid monohydrate. The dihedral angles between the planes of the carboxylic acid groups and the planar pyrazine ring are 2.0 (2) and 5.6 (2)°. The acid and water molecules form almost planar sheets connected by hydrogen bonds, with O…O distances ranging from 2.5143 (14) to 2.7330 (16) Å and an O…N distance of 2.8234 (18) Å. The shortest distance between two adjacent sheets is 3.2 (1) Å, indicating van der Waals-type interactions.
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Document Type: Research Article
Publication date: December 1, 2004