Crystal structure, Hirshfeld surface analysis and inter-action energy and DFT studies of (2Z)-4-benzyl-2-(2,4-di-chloro-benzyl-idene)-2H-1,4-benzo-thia-zin-3(4H)-one

Crystal structure, Hirshfeld surface analysis and inter-action energy, DFT and anti-bacterial activity studies of (Z)-4-hexyl-2-(4-methyl-benzyl-idene)-2H-benzo[b][1,4]thia-zin-3(4H)-one

The title compound, C22H25NOS, consists of methyl-benzyl-idene and benzo-thia-zine units linked to a hexyl moiety, where the thia-zine ring adopts a screw-boat conformation. In the crystal, inversion dimers are formed by weak C-HMthn⋯OBnzthz hydrogen bonds and are linked into chains extending along the a-axis direction by weak C-HBnz⋯OBnzthz (Bnz = benzene, Bnzthz = benzo-thia-zine and Mthn = methine) hydrogen bonds. A Hirshfeld surface analysis of the crystal structure indicates that the most important contributions for the crystal packing are from H⋯H (59.2%) and H⋯C/C⋯H (27.9%) inter-actions. Hydrogen bonding and van der Waals inter-actions are the dominant inter-actions in the crystal packing. Computational chemistry indicates that in the crystal, the C-HBnz⋯OBnzthz and C-HMthn⋯OBnzthz hydrogen-bond energies are 75.3 and 56.5 kJ mol-1, respectively. Density functional theory (DFT) optimized structures at the B3LYP/ 6-311 G(d,p) level are compared with the experimentally determined mol-ecular structure in the solid state. The HOMO-LUMO behaviour was elucidated to determine the energy gap. Moreover, the anti-bacterial activity of the title compound was evaluated against gram-positive and gram-negative bacteria.

Crystal structure, Hirshfeld surface analysis and inter-action energy, DFT and anti-bacterial activity studies of ethyl 2-[(2Z)-2-(2-chloro-benzyl-idene)-3-oxo-3,4-di-hydro-2H-1,4-benzo-thia-zin-4-yl]acetate

The title compound, C19H16ClNO3S, consists of chloro-phenyl methyl-idene and di-hydro-benzo-thia-zine units linked to an acetate moiety, where the thia-zine ring adopts a screw-boat conformation. In the crystal, two sets of weak C-HPh⋯ODbt (Ph = phenyl and Dbt = di-hydro-benzo-thia-zine) hydrogen bonds form layers of mol-ecules parallel to the bc plane. The layers stack along the a-axis direction with inter-calation of the ester chains. The crystal studied was a two component twin with a refined BASF of 0.34961 (5). The Hirshfeld surface analysis of the crystal structure indicates that the most important contributions to the crystal packing are from H⋯H (37.5%), H⋯C/C⋯H (24.6%) and H⋯O/O⋯H (16.7%) inter-actions. Hydrogen-bonding and van der Waals inter-actions are the dominant inter-actions in the crystal packing. Computational chemistry indicates that in the crystal, C-HPh⋯ODbt hydrogen bond energies are 38.3 and 30.3 kJ mol-1. Density functional theory (DFT) optimized structures at the B3LYP/ 6-311 G(d,p) level are compared with the experimentally determined mol-ecular structure in the solid state. The HOMO-LUMO behaviour was elucidated to determine the energy gap. Moreover, the anti-bacterial activity of the title compound has been evaluated against gram-positive and gram-negative bacteria.

Crystal structure, Hirshfeld surface analysis, inter-action energy and DFT studies of (2Z)-2-(2,4-di-chloro-benzyl-idene)-4-nonyl-3,4-di-hydro-2H-1,4-benzo-thia-zin-3-one

The title compound, C24H27Cl2NOS, contains 1,4-benzo-thia-zine and 2,4-di-chloro-phenyl-methyl-idene units in which the di-hydro-thia-zine ring adopts a screw-boat conformation. In the crystal, inter-molecular C-HBnz⋯OThz (Bnz = benzene and Thz = thia-zine) hydrogen bonds form chains of mol-ecules extending along the a-axis direction, which are connected to their inversion-related counterparts by C-HBnz⋯ClDchlphy (Dchlphy = 2,4-di-chloro-phen-yl) hydrogen bonds and C-HDchlphy⋯π (ring) inter-actions. These double chains are further linked by C-HDchlphy⋯OThz hydrogen bonds, forming stepped layers approximately parallel to (012). The Hirshfeld surface analysis of the crystal structure indicates that the most important contributions for the crystal packing are from H⋯H (44.7%), C⋯H/H⋯C (23.7%), Cl⋯H/H⋯Cl (18.9%), O⋯H/H⋯O (5.0%) and S⋯H/H⋯S (4.8%) inter-actions. Hydrogen-bonding and van der Waals inter-actions are the dominant inter-actions in the crystal packing. Computational chemistry indicates that in the crystal, C-HDchlphy⋯OThz, C-HBnz⋯OThz and C-HBnz⋯ClDchlphy hydrogen-bond energies are 134.3, 71.2 and 34.4 kJ mol-1, respectively. Density functional theory (DFT) optimized structures at the B3LYP/6-311 G(d,p) level are compared with the experimentally determined mol-ecular structure in the solid state. The HOMO-LUMO behaviour was elucidated to determine the energy gap. The two carbon atoms at the end of the nonyl chain are disordered in a 0.562 (4)/0.438 (4) ratio.