Structural investigation of N-[2-(4-fluoro-3-phen-oxy-benzo-yl)hydrazinecarbo-thio-yl]benzamide and N-[2-(4-fluoro-3-phen-oxy-benzo-yl)hydrazinecarbo-thio-yl]-4-meth-oxy-benzamide.

The compound N-[2-(4-fluoro-3-phen-oxy-benzo-yl)hydrazinecarbo-thio-yl]benzamide, C(21)H(16)FN(3)O(3)S, crystallizes in the monoclinic centrosymmetric space group P2(1)/c and its mol-ecular conformation is stabilized via an intra-molecular N-H⋯O hydrogen bond. The corresponding para-meth-oxy derivative, namely, N-[2-(4-fluoro-3-phen-oxy-benzo-yl)hydrazinecarbo-thio-yl]-4-meth-oxy-benzamide, C(22)H(18)FN(3)O(4)S, crystallizes in the monoclinic centrosymmetric space group C2/c. The supra-molecular network mainly comprises N-H⋯O, N-H⋯S and C-H⋯O hydrogen bonds, which contribute towards the formation of the crystal structures for the two mol-ecules. The different inter-molecular inter-actions have been further analysed using Hirshfeld surface analysis and fingerprint plots.