Tris(ethane-1,2-di-amine-κ2 N,N')zinc(II) tetra-chlorido-zincate(II).

The title complex, [Zn(C2H8N2)3][ZnCl4], exists as discrete ions. The [Zn(C2H8N2)3]2+ cation exhibits a distorted octa-hedral shape. In the [ZnCl4]2- anion, the ZnII atom is in an almost regular tetra-hedral environment. The crystal packing is consolidated by N-H⋯Cl and C-H⋯Cl hydrogen bonds.

Crystal structure of phenyl N-(3,5-di-methyl-phenyl)carbamate.

The asymmetric unit of the title compound, C15H15NO2, contains two independent mol-ecules (A and B). The di-methyl-phenyl ring, the phenyl ring and the central carbamate N-C(=O)-O group are not coplanar. In mol-ecule A, the di-methyl-phenyl and phenyl rings are inclined to the carbamate group mean plane by 27.71 (13) and 71.70 (4)°, respectively, and to one another by 84.53 (13)°. The corresponding dihedral angles in mol-ecule B are 34.33 (11), 66.32 (13) and 85.48 (12)°, respectively. In the crystal, the A and B mol-ecules are arranged alternately linked through N-H⋯O(carbon-yl) hydrogen bonds, forming -A-B-A-B- chains, which extend along [100]. Within the chains and linking neighbouring chains there are C-H⋯π inter-actions present, forming columns along the a-axis direction. The columns are linked by offset π-π stacking inter-actions, forming a three-dimensional network [shortest centroid-centroid distance = 3.606 (1) Å].

Crystal structure of 5-(5-chloro-2-hydroxy-benzo-yl)-2-(2-methyl-1H-indol-3-yl)nicotino-nitrile.

In the title compound, C22H14ClN3O2, the indole unit is essentially coplanar, with a maximum deviation of 0.035 Šfor the C atom bearing the methyl group. The central pyridine ring is inclined to the indole ring system by 43.7 (1)°. The dihedral angle between the phenyl ring and the indole ring system is 15.7 (2)°, while that between the phenyl ring and the central pyridine ring is 46.3 (1)°. The mol-ecular structure is stabilized by an intra-molecular O-H⋯O hydrogen bonding, forming an S(6) ring motif. In the crystal, mol-ecules are linked via pairs of N-H⋯N hydrogen bonds, forming inversion dimers with an R 2 (2)(16) ring motif. The crystal structure also features C-H⋯π and π-π inter-actions [centroid-centroid separation = 3.688 (1) Å].

Crystal structure of 1'-(prop-2-yn-1-yl)-1,4-di-hydro-spiro-[benzo[d][1,3]oxazine-2,3'-indolin]-2'-one.

In the title compound, C18H14N2O2, the six-membered oxazine ring adopts a half-chair conformation and its mean plane makes a dihedral angle of 83.23 (7)° with the pyrrolidine ring of the indoline ring system. In the crystal, mol-ecules are linked via N-H⋯O hydrogen bonds, forming chains along [100]. The chains are linked by C-H⋯π inter-actions, forming slabs parallel to (001).

Crystal structure of 2-methyl-amino-3-nitro-4-p-tolyl-pyrano[3,2-c]chromen-5(4H)-one.

In the racemic title compound, C20H16N2O5, the pyran ring adopts a shallow envelope conformation, with the stereogenic C atom displaced from the other atoms by 0.273 (2) Å. The dihedral angle between the fused-ring system and the pendant p-tolyl group is 87.62 (7)°. The mol-ecular conformation is consolidated by an intra-molecular N-H⋯O hydrogen bond, which generates an S(6) ring. In the crystal, mol-ecules are linked by C-H⋯O inter-actions, resulting in [010] chains.

Crystal structure of phenyl N-(4-nitro-phen-yl)carbamate.

The asymmetric unit of the title compound, C13H10N2O4, contains two independent mol-ecules (A and B). The dihedral angle between the aromatic rings is 48.18 (14)° in mol-ecule A and 45.81 (14)° in mol-ecule B. The mean plane of the carbamate N-C(=O)-O group is twisted slightly from the attached benzene and phenyl rings, making respective dihedral angles of 12.97 (13) and 60.93 (14)° in A, and 23.11 (14) and 59.10 (14)° in B. In the crystal, A and B mol-ecules are arranged alternately through N-H⋯O hydrogen bonds and C-H⋯π inter-actions, forming chains along the a axis. The chains are further linked by C-H⋯O hydrogen bonds into a double-chain structure.