In the title compound, C7H6ClNO3S, the nitro group forms a dihedral angle of 2.7 (4)° with the benzene ring. The bond-angle sum at the S atom is 303.7°. In the crystal, molecules are linked by weak C—H⋯O hydrogen bonds, forming layers lying parallel to (-101).
In the title compound, C8H6N2O3S, the dihedral angle between the nitro group and the benzene ring is 6.76 (9)°. The bond-angle sum at the S atom is 308.1°. In the crystal, molecules are linked by C—H⋯O hydrogen bonds to generate (010) sheets. The crystal studied was found to be a racemic twin.
In the title coordination polymer, [MnCl2(C7H5NS)2]n, the MnII ion is located on the intersection of a twofold rotation axis and a mirror plane and adopts an octahedral coordination geometry defined by two mutually trans N atoms from benzothiazole ligands which occupy the axial positions, and four Cl atoms which form the equatorial sites. The MnII ions are connected by two bridging Cl atoms, forming chains parallel to the c axis. The crystal packing can be descibed as alternating layers parallel to (001) featuring π–π stacking interactions with a centroid–centroid distance of 3.6029 (15) Å.
In the title compound, [ZnCl 2 (C 6 H 8 N 2 O 2 S) 2 ], the Zn II ion lies on a twofold rotation axis and has a slightly distorted tetrahedral coordination geometry, involving two Cl atoms and two N atoms from the amino groups attached directly to the benzene rings [Zn-Cl = 2.2288 (16) Å and Zn-N = 2.060 (5) Å ]. The dihedral angle between the benzene rings is 67.1 (3). The crystal packing can be describe as layers in a zigzag arrangement parallel to (001). The amine H atoms act as donor atoms and participate in intermolecular N-HÁ Á ÁO and N-HÁ Á ÁCl hydrogen bonds, forming a three-dimensional network. metal-organic compounds m28 Benmebarek et al.
Key indicators: single-crystal X-ray study; T = 293 K; mean (C-C) = 0.013 Å; R factor = 0.057; wR factor = 0.153; data-to-parameter ratio = 15.4.The asymmetric unit of the title complex, [PdCl 2 -(C 12 H 16 N 3 O)]Á0.5C 4 H 8 O, consists of one palladium complex in a general position and one half tetrahydrofuran (THF) solvent molecule, with the O atom lying on a twofold rotation axis. The Pd II atom is bound to one chelating imino nitroxide radical through two N atoms, one from the pyridyl ring and the other from the imidazoline ring. The coordination of the metal centre is completed by two Cl atoms in a cis configuration, leading to a quasi-square-planar coordination of the metal centre. The four atoms that define the Pd II coordination environment and the eight atoms that belong to the pyridylimine fragment are coplanar, with no deviation larger than 0.087 (5) Å . In the crystal structure, intermolecular interactions shorter than the corresponding van der Waals radii sum are observed only between Pd II complexes, and no short contact is observed around the THF molecule. Weak C-HÁ Á ÁO and C-HÁ Á ÁCl interactions yield a two-dimensional network of complexes in the (101) plane. Related literature
It is well known that sulfonamide derivatives, through exchange of different functional groups without modification of the –S(O)2N(H)– function, can exhibit a wide variety of pharmacological activities. In addition, some metal complexes of these ligands have been prepared to promote rapid healing of burns in humans and animals, for example, the complex of Zn(ii) sulfadiazine. Their effectiveness does not depend solely on the slow release of the metal ion, but rather strongly on the nature of the material to which the metal is bound. Given the ability of sulfonamide derivatives to coordinate with metal atoms in different ways, considerable interest in the synthesis and structural aspects of new complexes has arisen. These results confirm that the significant chemical capacity of sulfonamides to act as ligands is based on the acidity of its –S(O)2N(H)– function, which gives a donor anionic ligand, allied to the presence of atoms vicinal to nitrogen, sulfur or oxygen of the heterocyclic ring, which provide the stereochemical requirements for the realization of complexes with monodentate ligand, chelating agent or bridging ligand, providing monomeric structures, dimeric arrangements and polymers. In addition, the aromatic amino group is responsible for the chemical versatility of the sulfonamides, since it can act as a coordination site, as well as a reactive site for chemical modifications of sulfonamide complexes with very interesting biological purposes. In the present work, the synthesis and structure of a novel sulfanilamide complex: nitro (4-aminobenzenesulfonamide) zirconium was presented. Characterization of the complex was performed by infrared spectroscopic, thermogravimetric and X-ray diffraction analysis.
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