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In the title compound, C19H20N2O6, the azomethine [C=N = 1.269 (2) Å] double bond adopts an E conformation and the dihedral angle between the planes of the benzene rings is 17.41 (11)°. In the crystal, inversion dimers linked by pairs of N—H...O hydrogen bonds generate R22(16) loops. The dimers are connected by C—H...O and C—H...N hydrogen bonds, forming sheets lying parallel to (100).

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In the title compound, C14H13N3O2·H2O, the azomethine double bond adopts an E conformation and the N—N=C—C torsion angle is 178.37 (19)°. The dihedral angle between the benzene and pyridine rings is 5.58 (12)° and the C atom of the meth­oxy group is roughly coplanar with its attached ring [deviation = 0.157 (3) Å]. In the crystal, the components are linked by O—H...O, O—H...N, N—H...O and C—H...O hydrogen bonds, forming (001) sheets. The water O atom accepts one N—H...O and two C—H...O inter­actions from the adjacent organic mol­ecule.

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In the title compound, C17H18N2O4, the azomethine double bond adopts an E conformation with an N—N—C—C torsion angle of −178.3 (3)°. The benzene rings are almost coplaner, with a dihedral angle of 2.98 (14)° between their mean planes. In the crystal, the molecules are linked by N—H...O hydrogen bonds, resulting in chains of mol­ecules lying parallel to the b axis. The structure is further consolidated by rather weak C—H...O hydrogen-bonding inter­actions, resulting in six-membered rings about inversion centers linked into chains arranged parallel to the b axis.
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