(Z)-1-(2,5-Dichloro-3-thien-yl)ethanone semicarbazone

Abstract

The title mol-ecule, C<inf>7</inf>H<inf>7</inf>Cl<inf>2</inf>N <inf>3</inf>OS, is approximately planar [maximum deviation = 0.062 (1) Å]. Short inter-molecular distances between the centroids of the five-membered rings [3.5340 (8) Å] indicate the existence of ?-? inter-actions. An inter-esting feature of the crystal structure is the presence of short intra-molecular Cl?N inter-actions [3.0015 (11) Å]. Mol-ecules are linked via pairs of inter-molecular N - H?O hydrogen bonds, generating R <inf>2</inf> 2(8) ring motifs. Furthermore, N - H?O hydrogen bonds form R <inf>2</inf> 1(7) ring motifs with C - H?O contacts, further consolidating the crystal structure. In the crystal, mol-ecules are linked by these inter-molecular inter-actions, forming chains along [001]. © 2009 Fun et al.