Danitza Vargas

Supramolecular Structure, Thermal and Spectroscopic Properties of a New Coordination Polymer: Catena-Bis(μ2-4,4′-dipyridyldisulfide-κ2N,N′)-Bis(AQUO)-Copper(II)di-trifluoromethanesulfonate

A new supramolecular network of copper (II), [{Cu(bpds)2(H2O)2}] • 2CF3SO3]n, (I), (bpds = 4,4′-bipyridildisulfide) has been synthesized and characterized by elemental analysis and Fourier transform infrared (FT-IR) and its structure determined using X-ray crystallography. The thermal decomposition mechanism of the complex was studied by using thermogravimetry-derivative thermogravimetry (TG-DTG) techniques. X-ray structural analysis revealed that the coordination polymer displays 1D chains. The octahedral O2N4 chromophore surrounding the metal ion forms via two trans located water oxygen and four nitrogen from four bpds ligand. The structure consists of Cu(H2O)2 fragments linked by pairs of bpds ligand to form a double-stranded chain. The thermogravimetric analysis indicates sequential loss of adsorbed and coordinated water and triflate counter ion, prior to more comprehensive ligand fragmentation at elevated temperatures.

N-(triphenylmethylsulfanyl)phthalimide.

The title compound, C27H19NO2S, contains chains of fused R(2)(2) (19) rings formed by intermolecular C-H...O=C hydrogen bonds and running along the [011] and [0-11] directions. These chains are linked through short intermolecular C-H...pi contacts, giving rise to sheets. The conformation of the title compound is dominated primarily by the nearly orthogonal lone-pair orbitals on the N and S atoms.

THERMAL AND X-RAY CRYSTALLOGRAPHIC STRUCTURAL STUDIES ON (N,N-DIBENCYL)-4-NITROPHENYLSULFENAMIDE

Crystal and molecular structure and the thermal properties of (N,N-dibencyl)-4-nitrophenylsulfenamide, (C6H5CH2)2 NSC6H4-4-NO2, is herein presented. The structure is a divalent sulfur compound that crystallized in the monoclinic system, space group P21/c with a=9.274(2), b=6.013(1), c=32.147(9) A, b=95.55(2) and Dx=1.305 g cm-3 with Z=4. The plane C-S-N form a dihedral angle of 77.4(3) with the plane C19-N1-C20, and it represent a notable difference with other sulfenamides described in the literature. The thermogravimetric analysis reveal a decomposition of the product in two steps and another event, probably, associated to a endothermic phase transition

CRYSTAL AND MOLECULAR STRUCTURE OF 5-NITROPIRIDINE PIPERIDINE-SULFENAMIDE

Se describe la estructura cristalina y molecular de 5-nitropiridina piperidina-sulfenamida C10H13N3O2 S y se compara con otras sulfenamidas y con otros compuestos similares. Esta estructura pertenece a un tipo de compuestos de azufre divalente y cristaliza en el sistema ortorrombico, grupo espacial Pnma con a= 27.810(4), b=6.797(1), c=6.110(1)A, y Dx =1.376 g cm-3 con Z=4. La distancia de enlace S-N de 1.699(4) A es mas corta que un enlace simple S-N [1.74 A]. La molecula NO2-(C6H3N)-S-N(C 5H10) queda en un plano de espejo cristalografico

CRYSTAL AND MOLECULAR STRUCTURE OF THE COMPLEX SALTS DIETHYLAMMONIUM AND MORPHOLINIUM OF 5-NITROPYRIDINE SULFONATE

The two title salts, (CH2-CH3)2NH2+ C5NH3NO2SO3- and C4H8ONH2+ C5NH3NO2SO3-, crystallize in space group P21/n and P21/a respectively, with one ion pair in the asymmetric unit. In both structures, conventional hydrogen bonds link anions and cations in chains running along directions [1 0 1] and [0 1 0] for the first and second salts respectively

X-RAY CRYSTALLOGRAPHIC STRUCTURAL STUDY ON A NEW COORDINATION POLYMER: CATENA-di-μCHLORO-BIS[(di-2-PYRIDYLDISULFIDE- k² N, N') COPPER(I)]

abSTraCT In title compound, [CuCl(C 10 H 8 N 2 S 2 )] n , (I) each Cu(I) ion coordinates to two nitrogen atoms from two different ligands and to two chloro ions which bridge to another Cu(I) to complete a planar four-membered Cu 2 Cl 2 ring.The Cu + coordination geometry is best described as a slightly distorted tetrahedron. The structure consists of CuCl cores connected by 2, 2’-dypyridyldisulfide ligand and form a two-dimensional extended polymeric network in which the 2, 2’-dipyridyldisulfide ligand bridges Cu atoms. The title compound is isostructural with di-µ-chlorido-bis[(di-2-pyridyldisulfide-κ 2 N, N’) copper(I)], (II) 1 , which is a zero-dimensional binuclear compound. The two structures differ due conformational flexibility of ligand, which have axial conformation in (I) and equatorial conformation in (II), torsion angles S-S-C-N (axial ring) 168.8(4)o; for (I) and 72.0(3)o for (II) respectively. Keywords: Coordination polymes, disulfides, x-ray diffraction. INTrODuCTION

Diisopropyl­ammonium 2-[(2,4-dinitro­phenyl)­sulfanyl­amino­carbonyl]­benzoate

The structure of title compound, C6H16N+.C14H8N3O7S-, comprises discrete ions which are interconnected by N-H...O- and N-H+...O- hydrogen bonds, leading to a neutral one-dimensional network along [100]. These hydrogen bonds appear to complement the Coulombic interaction and help to stabilize the structure further.