Crystal structures of 4-[(4-methylbenzyl)oxy]benzohydrazide and its N'-[(thiophen-2-yl)methylidene]- derivative

The molecular and crystal structures of a benzoylhydrazine bearing an ether group, 4-[(4-methylbenzyl)oxy]benzohydrazide, C15H16N2O2, (I), and of the corresponding N0-[(thiophen-2-yl)methylidene]- derivative, 4-[(4-methylbenzyl)oxy]-N'-[(thiophen-2-yl)methylidene]benzohydrazide, C20H18N2O2S, (II), are described. The supramolecular structures of both compounds are governed by N-H center dot center dot center dot N and N-H center dot center dot center dot O hydrogen-bonding interactions. The hydrazine compound (I) shows a crystal packing with a more complex hydrogen-bonding scheme because of the NH-NH2 entity, forming a di-periodic supramolecular structure extending parallel to (100). Hydrazone molecules in (II) are hydrogenbonded through N-H center dot center dot center dot O interactions, giving rise to the formation of ribbons parallel to [010]. Molecules of (I) and (II) show a different orientation of the carbohydrazide moiety likely to favor the crystal packing and thus hydrogenbonding interactions.