Crystal structures of 4-[(4-methyl-benz-yl)-oxy]benzohydrazide and its N '-[(thio-phen-2-yl)-methyl-idene]- derivative.

The mol-ecular and crystal structures of a benzoyl-hydrazine bearing an ether group, 4-[(4-methyl-benz-yl)-oxy]benzohydrazide, C 15 H 16 N 2 O 2 , (I), and of the corresponding N '-[(thio-phen-2-yl)-methyl-idene]- derivative, 4-[(4-methyl-benz-yl)-oxy]- N '-[(thio-phen-2-yl)-methyl-idene]benzohydrazide, C 20 H 18 N 2 O 2 S, (II), are described. The supra-molecular structures of both compounds are governed by N-H⋯N and N-H⋯O hydrogen-bonding inter-actions. The hydrazine compound (I) shows a crystal packing with a more complex hydrogen-bonding scheme because of the NH-NH 2 entity, forming a di-periodic supra-molecular structure extending parallel to (100). Hydrazone mol-ecules in (II) are hydrogen-bonded through N-H⋯O inter-actions, giving rise to the formation of ribbons parallel to [010]. Mol-ecules of (I) and (II) show a different orientation of the carbohydrazide moiety likely to favor the crystal packing and thus hydrogen-bonding inter-actions.