title: Crystal structure of (E)-2-[(4-chloro-2H-chromen-3-yl)methyl-idene]-N-cyclo-hexyl-hydrazinecarbo-thio-amide.
abstract: In the title compound, C17H20ClN3OS, the mean plane of the central thio-urea core makes dihedral angles of 26.56 (9) and 47.62 (12)° with the mean planes of the chromene moiety and the cyclo-hexyl ring, respectively. The cyclo-hexyl ring adopts a chair conformation. The N-H atoms of the thio-urea unit adopt an anti conformation. The chromene group is positioned trans, whereas the cyclo-hexyl ring lies in the cis position to the thione S atom, with respect to the thio-urea C-N bond. In the crystal, mol-ecules are linked by N-H⋯S hydrogen bonds, forming inversion dimers enclosing R (2) 2(8) ring motifs. The dimers are linked by C-H⋯Cl hydrogen bonds, enclosing R (6) 6(44) ring motifs, forming sheets lying parallel to (010).
authors.affiliation: Department of Physics, Ethiraj College for Women (Autonomous), Chennai 600 008, India.
authors.forename: Rajeswari
authors.initials: R
authors.lastname: Gangadharan
authors.affiliation: Department of Chemistry, National Institute of Technology, Tiruchirappalli 620 015, India.
authors.forename: Jebiti
authors.initials: J
authors.lastname: Haribabu
authors.affiliation: Department of Chemistry, National Institute of Technology, Tiruchirappalli 620 015, India.
authors.forename: Ramasamy
authors.initials: R
authors.lastname: Karvembu
authors.affiliation: Department of Physics, RKM Vivekananda College (Autonomous), Chennai 600 004, India.
authors.forename: K
authors.initials: K
authors.lastname: Sethusankar
keywords: chromene; crystal structure; cyclo­hex­yl; hydrazine; hydrogen bonds; thio­amide