M. Mazhar

Synthesis, characterization and biological activity of dimethyltin dicarboxylates containing germanium.

A series of diorganotin dicarboxylates of the general formula (CH3)2Sn(OCOCHR3CHR2GeR1)2 where R1=(C6H5)3, (P-CH3C6H4)3, N(CH2CH2O)3, R2=C6H5, H, CH3, P-CH3OC6H4, P-ClC6H4, P-CH3C6H4, R3=CH3 and H, have been synthesized by the reaction of dimethyltin oxide with germanium substituted propionic acid in 1:2 molar ratio in toluene. The H2O formed was removed azeotropically using a Dean and Stark apparatus. All the compounds have been characterized by IR, multinuclear (1H, 13C, 119Sn) NMR, mass and Mössbauer spectroscopies. All compounds were found to have potential activity against bacteria.

SYNTHESIS AND SPECTRAL STUDIES OF TRI- AND DIORGANOTIN(IV) COMPLEXES WITH 5-BENZOYL-α-METHYL-2-THIOPHENEACETIC ACID: CRYSTAL STRUCTURE OF [(CH3)3Sn(C14H11O3S)]

ABSTRACT A series of tri- and diorganotin(IV) complexes of the general formula R4−nSnLn (where R=CH3, C4H9, C6H6, C7H7, n=1, 2 and HL=5-benzoyl-α-methyl-2-thiopheneacetic acid) have been sythesized by the reaction of tri- and diorganotin- (IV) chloride(s) with the silver salt of the ligand in CHCl3 solution. All of the compounds have been characterized by IR, conductance measurement, multinuclear (1H, 13C, 119Sn) NMR, UV-Vis and mass spectrometery. An X-ray crystal structure of the representative compound (CH3)3SnL confirms a trigonal bipyramid around the tin atom, having the space group P21/a with a monoclinic crystal system.

Crystal and molecular structures of two polymeric triorganotin 2-(2-thiophenyl)-ethylene-1-carboxylate derivatives

The crystal and molecular structures of [Me3Sn(TA)] and [Et3Sn(TA)], where TA is 3(2-thiophenyl)-2-propenoate, are reported. The structures are polymeric owing to the presence of bidentate bridging carboxylate ligands; no evidence was found for Sn to S interactions. The Sn atom geometries are distorted trigonal bipyramidal with the organo substituents occupying equatorial positions. The structures found for the title compounds conform to the frans-R3S η O2 motif.

Trimetallic supported catalyst for renewable source of energy and environmental control through CO2 conversion.

A supported catalyst and a catalytic process have been developed for the conversion of carbgas (CO2 + (100 ppm) H2O + 1% H2) as a renewable source of energy and as a measure for the control of carbon dioxide – a greenhouse gas. The carbgas was passed over a trimetallic supported catalyst consisting of ruthenium (Ru), manganese (Mn) and cobalt (Co) dispersed on a high surface area titanium dioxide support at 673 K and at atmospheric pressure with a gas space velocity of 6000–7200/h. The catalytic reaction produces methanol and propyne in a fixed bed reactor system. The catalyst simultaneously splits water into hydrogen and oxygen, and carbon dioxide into carbon and oxygen under very mild reaction conditions and at atmospheric pressure. The oxygen generated during the reaction and the addition of hydrogen during the catalytic reaction not only generates a considerable amount of energy for the reaction to proceed but also sustains the oxidation states of Ru, Mn and Co. This process maintains the specific active oxidation states of the metals during the catalytic run – a key step in the process.

Synthesis, characterization and variable temperature NMR studies on coordination geometry of dimethytin(IV) S(+)-2-(4-isobutylphenyl)propanoate

Dimethytin(IV) S(+)-2-(4-isobutylphenyl)propanoate was synthesized and characterized by elemental analysis and IR and variable temperature NMR spectroscopy. Variable temperature NMR analysis was performed to see the effect of temperature on coordination geometry of organotin complexes in non-coordinating solvent. Spectral data has shown that temperature change does not alter the coordination geometry of the complex, and that it remains greater than four at variable temperatures as well as at room temperature in solution state.

Density Meter for Solids

Design of a very simple density meter for determining the density of any solid materials through water displacement.