N′-[(E)-2-Hydroxybenzylidene]-2-(6-methoxynaphthalen-2-yl)propanohydrazide: a redetermination

Abstract

The structure of the title compound, C21H20N2O3, was originally determined at ambient temperature [Wuet al.(2007).Inorg. Chim. Acta,360, 3069–3074]. In this determination, with data collected at 150 K, the asymmetric unit comprises two independent molecules (1 and 2) that differ considerably in their conformations. In particular, the methyl group at the mid-point of molecule 2 is disordered over two sites. This was modelled with restraints so that the geometries of the two components are comparable and the disorder components refined to an occupancy ratio of 0.750 (6):0.250 (6). Intramolecular O—H...N and intermolecular N—H...O hydrogen bonds stabilize the structure with significant additional input from C—H...π interactions.