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The title Schiff base, C14H11NO3, crystallizes as a zwitterion (i.e. proton transfer from the carb­oxy­lic acid group to the imine N atom). The dihedral angle between the aromatic rings is 19.59 (6)° and an intra­molecular N—H...O hydrogen bond closes an S(6) ring. In the crystal, inversion dimers linked by pairs of O—H...O hydrogen bonds generate R24(24) loops. The dimers are linked by C—H...O inter­actions, generating (211) sheets.

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In the title hydrate, C11H11NO6·H2O, the organic mol­ecule is approximately planar (r.m.s. deviation for the non-H atoms = 0.129 Å) and an intra­molecular O—H...O hydrogen bond closes an S(6) ring. In the crystal, the benzoic acid group participates in an O—H...O hydrogen bond to the water mol­ecule and accepts a similar bond from another water mol­ecule. The other –CO2H group forms a carb­oxy­lic acid inversion dimer, thereby forming an R22(8) loop. These bonds, along with N—H...O and C—H...O inter­actions, generate a three-dimensional network.
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