Crystal structures of (E)-N'-(2-hy-droxy-5-methyl-benzyl-idene)isonicotinohydrazide and (E)-N'-(5-fluoro-2-hy-droxy-benzyl-idene)isonicotinohydrazide

Crystal structure of (E)-N'-(3-fluoro-2-hy-droxy-benzyl-idene)isonicotinohydrazide

In the title compound, C13H10FN3O2, the mol-ecule has an E conformation with respect to the C=N bond of the hydrazone bridge. The dihedral angle between the isonicotinoyl and fluoro-phenol moieties is 4.03 (4)°, and an intra-molecular O-H⋯N hydrogen bond generates an S(6) ring motif. In the crystal, mol-ecules are linked by N-H⋯N and C-H⋯N hydrogen bonds, forming chains propagating along the a-axis direction. The chains are linked by C-H⋯O hydrogen bonds, resulting in the formation of layers lying parallel to the ab plane. The crystal structure also features π-π inter-actions [centroid-to-centroid distance = 3.6887 (8) Å].

Crystal structures of the Schiff base derivatives (E)-N'-[(1H-indol-3-yl)methyl-idene]isonicotino-hydrazide ethanol monosolvate and (E)-N-methyl-2-[1-(2-oxo-2H-chromen-3-yl)ethyl-idene]hydrazinecarbo-thio-amide

The crystal structures of two title Schiff base derivatives, C15H12N4O·C2H6O (1·EtOH) and C13H13N3O2S (2), were determined at 110 and 100 K, respectively. In the crystal of compound 1·EtOH, the (E)-N'-[(1H-indol-3-yl)methyl-idene]isonicotinohydrazide and ethanol mol-ecules are linked by O-H⋯O, N-H⋯O and N-H⋯N hydrogen bonds, forming a tape structure running along the b-axis direction. The tapes are weakly linked via a C-H⋯N inter-action. In the crystal of compound 2, (E)-N-methyl-2-[1-(2-oxo-2H-chromen-3-yl)ethyl-idene]hydrazinecarbo-thio-amide mol-ecules are linked via N-H⋯O and C-H⋯O hydrogen bonds, forming a helical chain along the b-axis direction. The chains are further linked into a layer expanding parallel to (102) through C-H⋯S inter-actions.