1,1',1'',1'''-(Oxydi-methane-tri-yl)tetra-kis-(4-fluoro-benzene).

In the title compound, C26H18F4O2, the dihedral angles between pairs of benzene rings linked to the same C atom are 80.55 (8) and 79.11 (7)°. The crystal packing features C-H⋯π inter-actions and shows stacking when viewed along the c axis.

Ethyl (4-{[(di-ethyl-carbamo-thio-yl)sulfan-yl]meth-yl}-2-oxo-2H-chromen-7-yl)carbamate.

In the title compound, C18H22N2O4S2, the 2H-chromene ring system is essentially planar (r.m.s. deviation = 0.012 Å). The mol-ecular conformation is stabilized by a C-H⋯O hydrogen bond. In the crystal, N-H⋯S and C-H⋯O hydrogen bonds occur, the former enclosing an R (2) 2(22) ring motif, and lead to the formation of a two-dimensional slab-like network lying parallel to (10-1). π-π inter-actions are observed between inversion-related aromatic rings [shortest centroid-centroid distance = 3.6300 (11) Å].

4-(Oct-yloxy)phenyl 2-oxo-2H-chromene-3-carboxyl-ate.

In the title compound, C(24)H(26)O(5), the 2H-chromene ring system is essentially planar, with a maximum deviation of 0.029 (2) Šfrom the best-fit mean plane incorporating both rings. The dihedral angle between the 2H-chromene ring system and the benzene ring is 21.00 (1)°. In the crystal, pairs of C-H⋯O hydrogen bonds generate an R(2) (2)(8) ring pattern. These contacts are bolstered by weaker bifurcated C-H⋯O hydrogen bonds.

(2E)-1-(5-Bromothiophen-2-yl)-3-(4-chloro-phen-yl)prop-2-en-1-one.

In the title compound, C13H8BrClOS, the thio-phene and phenyl rings are inclined by 40.69 (11)° to each other. The crystal structure is characterized by C-H⋯π inter-actions, which link the mol-ecules into broad layers parallel to (100). Short Br⋯Cl contacts [3.698 (1) Å] link these layers along [100].

N-[4-Acetyl-5-(4-fluoro-phen-yl)-4,5-di-hydro-1,3,4-thia-diazol-2-yl]acetamide.

The title mol-ecule, C12H12FN3O2S, shows a short intra-molecular S⋯O contact of 2.682 (18) Å. The dihedral angle between the thia-diazole ring and the benzene ring is 86.82 (11)°. In the crystal, N-H⋯O and C-H⋯O hydrogen bonds generate an R 2 (1)(6) graph-set motif between adjacent mol-ecules. Pairs of futher C-H⋯O hydrogen bonds form inversion dimers with R 2 (2)(8) ring motifs. These combine to generate a three-dimensional network and stack the mol-ecules along the b axis.

2-Oxo-2-(2-oxo-2H-chromen-3-yl)ethyl pyrrolidine-1-carbodi-thio-ate.

There are two independent mol-ecules in the asymmetric unit of the title compound, C16H15NO3S2, in which the pyrrolidine rings adopt envelope conformations, with a methyl-ene C atom as the flap. The dihedral angles betweeen the near-planar 2H-chromene ring systems [maximum deviations = 0.0167 (20) and 0.0136 (19) Å] and the pyrrolidine rings (all atoms) are 83.83 (11) and 82.43 (11)°. In the crystal, inversion dimers linked by pairs of C-H⋯O hydrogen bonds occur for one of the mol-ecules. Further C-H⋯O links involving both mol-ecules generate a three-dimensional network.

4-Hy-droxy-6-(4-meth-oxy-phen-yl)-4-phenyl-1,3-diazinane-2-thione.

In the title compound, C(17)H(18)N(2)O(2)S, the 1,3-diazinane-2-thione ring system is not coplanar with the benzene ring and meth-oxy-phenyl ring system, the dihedral angle between the planes being 65.58 (13) and 89.18 (10)°, respectively. The crystal structure is characterized by inter-molecular O-H⋯S, N-H⋯S, N-H⋯O and C-H⋯S hydrogen bonding.

3-[2-(2,6-Dichloro-anilino)benz-yl]-4-[(4-meth-oxy-benzyl-idene)amino]-1H-1,2,4-triazole-5(4H)-thione.

In the title compound, C(23)H(19)Cl(2)N(5)OS, the triazole ring makes dihedral angles of 24.81 (18), 69.94 (19) and 35.68 (18)° with the dichloro-phenyl, benzene and meth-oxy-phenyl rings, respectively. An intra-molecular N-H⋯N hydrogen bond occurs. In the crystal, inversion dimers linked by pairs of N-H⋯S hydrogen bonds occur. In addition, there are weak C-H⋯π inter-actions involving the dichloro-phenyl and triazole rings.

Crystal structure of (6-bromo-2-oxo-2H-chromen-4-yl)methyl morpholine-4-carbodi-thio-ate.

In the title compound, C15H14BrNO3S2, the 2H-chromene ring system is nearly planar, with a maximum deviation of 0.034 (2) Å, and the morpholine ring adopts a chair conformation. The dihedral angle between best plane through the 2H-chromene ring system and the morpholine ring is 86.32 (9)°. Intra-molecular C-H⋯S hydrogen bonds are observed. In the crystal, inversion-related C-H⋯S and C-H⋯O inter-actions generate R 2 (2)(10) and R 2 (2)(8) rings patterns, respectively. In addition, the crystal packing features π-π inter-actions between fused benzene rings [centroid-centroid distance = 3.7558 (12) Å].

Crystal structure of 6-chloro-5-(2-chloro-eth-yl)-3-(propan-2-yl-idene)indolin-2-one.

The title compound, C13H13Cl2NO, has a 3-(propan-2-yl-idene)indolin-2-one core with a Cl atom and a chloro-ethyl substituent attached to the aromatic ring. Two atoms of the aromatic ring and the chloro-ethyl substituent atoms are disordered over two sets of sites with a refined occupancy ratio of 0.826 (3):0.174 (3). In the crystal, mol-ecules are linked by pairs of N-H⋯O hydrogen bonds, forming inversion dimers with an R 2 (2)(8) ring motif.

Crystal structure of (7-methyl-2-oxo-2H-chromen-4-yl)methyl piperidine-1-carbo-di-thio-ate.

In the title compound, C17H19NO2S2, the 2H-chromene ring system is nearly planar, with a maximum deviation of 0.0383 (28) Å, and the piperidine ring adopts a chair conformation. The 2H-chromene ring makes dihedral angles of 32.89 (16) and 67.33 (8)°, respectively, with the mean planes of the piperidine ring and the carbodi-thio-ate group. In the crystal, C-H⋯O and weak C-H⋯S hydrogen bonds link the mol-ecules into chains along [001]. The crystal structure also features C-H⋯π and π-π inter-actions, with a centroid-centroid distance of 3.7097 (17) Å.