Abstract

X-ray analysis reveals that the title compound, C 14 H 13 N 3 O 2 .H 2 O, is in keto tautomeric form and the configuration at the azomethine C=N double bond is E. The pyridine plane makes a dihedral angle of 39.9 (1)° with the plane through the central hydrazone bridge. The crystal structure is stabilized by extensive hydrogen bonding involving the water molecule and the hydrazone bridge.

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