title: Crystal structure of 1-{(Z)-[(2E)-3-(4-chloro-phen-yl)-1-phenyl-prop-2-en-1-yl-idene]amino}-3-ethyl-thio-urea.
abstract: In the title thio-semicarbazone compound, C18H18ClN3S, the CN3S residue is almost planar (r.m.s. deviation = 0.0031 Å) and forms dihedral angles of 65.99 (7) and 34.60 (10)° with the phenyl and chloro-benzene rings, respectively; the dihedral angle between the aromatic rings is 85.13 (8)°. The conformation about the C=N bond is Z, and that about the C=C bonds is E. The imine N and ethyl N atoms are syn and are linked by an eth-yl-imine N-H⋯N hydrogen bond. This H atom also forms an inter-molecular hydrogen bond to the thione S atom, resulting in a supra-molecular helical chain propagating along the b axis. The chains are consolidated into a three-dimensional architecture by phenyl-C-H⋯Cl contacts and weak π-π inter-actions between centrosymmetrically related chloro-benzene rings [inter-centroid distance = 3.9127 (15) Å].
authors: Department of Chemistry, Universiti Putra Malaysia, 43400 Serdang, Malaysia.
authors: Ming Yueh
authors: MY
authors: Tan
authors: Department of Chemistry, Universiti Putra Malaysia, 43400 Serdang, Malaysia.
authors: Karen A
authors: KA
authors: Crouse
authors: Department of Chemistry, Universiti Putra Malaysia, 43400 Serdang, Malaysia.
authors: Thahira Begum S A
authors: TB
authors: Ravoof
authors: Centre for Crystalline Materials, Faculty of Science and Technology, Sunway University, No. 5 Jalan Universiti, 47500 Bandar Sunway, Selangor Darul Ehsan, Malaysia.
authors: Edward R T
authors: ER
authors: Tiekink
keywords: crystal structure; hydrogen bonding; thio­semicarbazone