Coco K. Y. A. Okio

Preparação do composto de associação entre citrato de ródio(II) e β-ciclodextrina

Inclusion compound of rhodium(II) citrate with β-cyclodextrin in a 1:1 molar ratio was prepared using freeze-drying method. X-ray diffactometry, thermal analysis (TG/DTG/DSC), infrared and 1H-NMR with 1H spin lattice relaxation (1H T1) measurements and 13C techniques were used to characterize the system prepared. The results indicated the formation of inclusion or association compounds between rhodium(II) citrate and β-cyclodextrin.

Tin(IV) Complexes of 1,5-Diphenylthiocarbazone and Thiosemicarbazide: Synthesis, X-Ray Characterization, and Biological Activity

Abstract The reaction of Me2SnCl2 with dithizone or thiosemicarbazide produced two novel di-organotin derivatives in good yields, which were characterized by X-ray diffraction. The crystal structures show that the compounds present a distorted pentacoordinated tin(IV) metal center. The antimicrobial activity of the new compounds was studied against Gram-negative (Escherichia coli, Klebsiella pneumonia, Salmonella enteritidis) and Gram-positive (Staphylococcus aureus) bacteria, and the yeast Saccharomyces cerevisiae. It was observed that the coordination of tin metal has a pronounced effect on the microbial activities of the ligands. All the tin complexes have shown higher antimicrobial effect than the free ligands. GRAPHICAL ABSTRACT

Crystal structure of bis-(benzoato-κO)di-butyl-tin(IV), nBu2Sn(bzo)2.

The title compound, [Sn(C4H9)2(C6H5COO)2], was synthesized in order to study the interaction between di-n-butyltin(IV) oxide and some carboxylic acids. Di-n-butyltin(IV) dibenzoate, nBu2Sn(obz)2, exhibits the same structural features as other diorganotin(IV) dibenzoates characterized by an unsymmetrical bidentate bonding mode [Δ(Sn—O) ≃ 0.4 Å] of the two benzoate groups to tin.

Chloridodimeth­yl(thio­semi­carbazide)tin(IV) chloride

In the title salt, [Sn(CH3)2Cl(CH4N3S)]Cl, the SnIV atom is five-coordinated in a distorted trigonal-bipyramidal geometry with two methyl groups and one S atom in the equatorial plane, and one N atom and one Cl atom occupying the apical positions. In the crystal, molecules are linked by intermolecular N—H⋯S hydrogen bonds with set graph-motif C(4) along [010]. N—H⋯ Cl hydrogen bonds with graph-set motif D(2) and D 3 3(10) link cations and anions.

(3-Anilino-1-phenyl-imino-thio-ureato)chloridodimethyl-tin(IV).

In the title compound, [Sn(CH3)2(C13H11N4S)Cl], the Sn atom is five-coordinated in a distorted trigonal-bipyramidal geometry, with two methyl groups and one S atom in the equatorial plane, and one N atom and the Cl atom occupying the apical positions.

Bis(μ-benzoato-κ2O:O′)bis­(benzoato-κO)octabutyldi-μ3-oxido-tetra­tin(IV)

The asymmetric unit of [{Sn(C4H9)2(C6H5COO)}2O]2 consists of two independent centrosymmetric half formula units. Both molecules adopt the ladder structure typical for this class of dimeric tetraorganodistannoxane dicarboxylates. A nearly linear very short C—H⋯O contact gives rise to a chain-like arrangement of molecules in the [111] direction

Crystal structure of (E)-2-hy­droxy-1,2-di­phenyl­ethan-1-one oxime

The H atom of the oxime moiety is equally disordered over two positions, giving rise to two equivalent hydrogen bonds between adjacent molecules.

Di-μ(2)-chlorido-dichloridoocta-methyldi-μ(3)-oxido-tetra-tin(IV) bis[chloridodimeth-yl(pyrrolidine-1-carbodithio-ato-κ(2)S,S')tin(IV)].

In the title co-crystal, [Sn4(CH3)8Cl4O2]·2[Sn(CH3)2Cl(C4H8NS2)], all the SnIV atoms are in distorted trigonal–bipyramidal environments. In the mononuclear species, the carbodithioate ligand is unsymmetrically coordinated to the SnIV atom, with Sn—S distances of 2.6722 (12) and 2.4706 (11) Å. All atoms with the exception of the methyl groups and one of the pyrrolidine ring CH2 groups lie on a crystallographic mirror plane. The pyrrolidine ring exhibits an envelope conformation; the C atom at the flap is disordered above and below the plane of symmetry with fixed occupation factors of 0.50. The centrosymmetric dimer species consists of a central Sn2O2 unit with two adjacent Sn2OCl four-membered rings.

Redetermination of tetra-kis(N,N-diethyl-dithio-carbamato)tin(IV).

The crystal structure of the title compound, [Sn(C5H10NS2)4], was originally determined by Harreld & Schlemper [Acta Cryst. (1971), B27, 1964–1969] using intensity data estimated from Weissenberg films. In comparison with the previous refinement, the current redetermination reveals anisotropic displacement parameters for all non-H atoms, localization of the H atoms, and higher precision of lattice parameters and interatomic distances. The complex features a distorted S6 octahedral coordination geometry for tin and a cis disposition of the monodentate dithiocarbamate ligands.