Crystal structures of the Schiff base derivatives (E)-N′-[(1H-indol-3-yl)methyl­idene]isonicotino­hydrazide ethanol monosolvate and (E)-N-methyl-2-[1-(2-oxo-2H-chromen-3-yl)ethyl­idene]hydrazinecarbo­thio­amide

The crystal structures of two title Schiff base derivatives, C(15)H(12)N(4)O·C(2)H(6)O (1·EtOH) and C(13)H(13)N(3)O(2)S (2), were determined at 110 and 100 K, respectively. In the crystal of compound 1·EtOH, the (E)-N′-[(1H-indol-3-yl)methyl­idene]isonicotinohydrazide and ethanol mol­ecules 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 inter­action. In the crystal of compound 2, (E)-N-methyl-2-[1-(2-oxo-2H-chromen-3-yl)ethyl­idene]hydrazinecarbo­thio­amide mol­ecules 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 inter­actions.