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, C(15)H(16)N(2)O(2), (I), and of the corresponding N′-[(thio­phen-2-yl)­methyl­idene]- derivative, 4-[(4-methyl­benz­yl)­oxy]-N′-[(thio­phen-2-yl)­methyl­idene]benzohydrazide, C(20)H(18)N(2)O(2)S, (II), are described. The supra­molecular structures of both compounds are governed by N—H⋯N and N—H⋯O hydrogen-bonding inter­actions. 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 supra­molecular structure extending parallel to (100). Hydrazone mol­ecules in (II) are hydrogen-bonded through N—H⋯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 hydrogen-bonding inter­actions.