nan Sadiq-ur-Rehman

Thermal degradation analysis of organotin(IV) esters

The di- and tri-organotin(IV) complexes of n-butyl hydrogenphthalate and (Z) 3-(4-nitrophenyl)-2-phenyl-2-propenoate were subjected to thermal decomposition by mean of thermogravimetry (TG). The decomposition occurred in steps and the kinetics of every set of reactions was determined using the method described by Coats and Redfern. These results were analyzed to establish the decomposition kinetics and, hence, to calculate the activation energies. The activation energies were also determined by applying the methods described by Horowitz and Metzger, which yielded comparable results. These results confirm that both the ligands act as bidentate in the solid state.

Synthesis, structural elucidation and biological activities of organotin(IV) derivatives of (E)-3-(4-methoxyphenyl)-2-(4-chlorophenyl)-2-propenoic acid

A new series of di- and tri-organotin(IV) compounds with the general formula R4−n SnLn, where Rxa0=xa0Me (1,2), Et (3), n-Bu (4,5), n-Oct (6), Ph (7) and Lxa0=xa0(E)-3-(4-methoxyphenyl)-2-(4-chlorophenyl)-2-propenoate, were synthesized by reaction of silver salt of ligand or ligand acid with diorganotin dichloride/oxide and triorganotin chloride in 2:1 and 1:1 molar ratio, respectively. These compounds were characterized by elemental analyses, FT-IR, multinuclear (1H, 13C, 119Sn) NMR and mass spectrometry. The spectroscopic results revealed that all the diorganotin(IV) compounds possess trigonal bipyramidal structures in solution and octahedral geometry in the solid state around the tin atom. A linear polymeric trigonal bipyramidal structure in the solid state and a tetrahedral environment around the tin atom in non-coordinating solvents has been proposed for the triorganotin(IV) compounds. All synthesized compounds were tested in vitro against a number of microorganisms to assess their biocidal activity. These studies revealed that ligand acid and some of its organotin compounds show promising activity against different strains of bacteria and fungi but lowered than reference drugs.

Dichloridobis(dimethyl sulfoxide-κ O )diphenyltin(IV)

The geometry around the Sn atom of the title compound, [Sn(C6H5)2Cl2(C2H6OS)2], is distorted octaxadhedral, with Sn—C and Sn—O distances lying in the ranges 2.139u2005(4)–2.156u2005(4) and 2.270u2005(2)–2.279u2005(2)u2005A, respectively. Molxadecules are linked by interxadmolecular C—H⋯O and C—H⋯Cl hydrogen bonds, and by C—H⋯π interxadactions with distances of 2.8 and 2.75u2005A.

4‐(2‐Pyridyl)piperazin‐1‐ium chloride

The title compound, C9H14N3+·Cl−, crystallizes at room temperature from chloroxadform as a zwitterion. The molxadecules are linked by N—H⋯Cl hydrogen bonds into chains. The piperazine ring adopts a chair conformation.

(Z)-3-(4-Nitro­phen­yl)-2-phenyl-2-propenoic acid monohydrate

In the crystal structure of the title compound, C15H11NO4·H2O, there are hydrogen-bonded clusters involving conventional and unconventional hydrogen bonds of the types O—H⋯O and C—H⋯O. Pairs of molxadecules lie parallel to each other in a head-to-tail fashion, exhibiting strong π–π overlapping.

(E)-3-(4-Chloro-phen-yl)-2-phenyl-prop-2-enoic acid.

In the title molecule, C15H11ClO2, the mean planes of the benzene and phenyl rings are inclined at 69.06u2005(11)° with respect to each other. The crystal structure is stablized by strong intermolecular O—H⋯O hydrogen bonds between the acid groups of pairs of molecules related by inversion centers.

Poly[μ2-chlorido-nona­methyl-μ3-nitrato-tritin(IV)]. Corrigendum

Corrigendum to Acta Cryst. (2007), E63, m2329.

N,N′-Bis(2-phenyl­ethyl)thio­urea

The structure of the title compound, C17H20N2S, exhibits hydrogen bonding of the type N—H⋯S, resulting in chains of molxadecules running along the b axis.

3-(2-Fur­yl)-2-phenyl­propenoic acid

The asymmetric unit of the title compound, C13H10O3, contains two molxadecules with small conformational differences. Both molxadecules form hydrogen-bonded inversion dimers through their carboxyl groups.