Complexes of the type R2SnL2, where R = phenyl, butyl and methyl and LH = 2-thioacetic-5-phenyl-1,3,4-oxadiazole, have been synthesized and characterized by physico-chemical (elemental analysis, and electrolytic conductance) and spectral (UV-Visible, IR and (1H, 13C and 119Sn NMR) techniques. Monomer structures for the complexes, bidentate and octahedral geometry was proposed for the complexes prepared. Preliminary in vitro tests for fungicidal activity show that all prepared compounds display good activity to Gibberela, Cercospora arachidicola, Physolospora piricola and Fusarium oxysporum. Moreover, the Ph2SnL2 shows a higher inhibition percentage then diorganotin carboxylate.
In the last few decades, the chemistry of organotin (IV) complexes of many biologically important compounds, has received significant interest in the preparation, identification and application of organotin units which are employed as photo-stabilizers, pesticides, pharmaceuticals and fire retardants. Biological properties of the system are modified by changing the organic ligands in organotin(IV) complexes. Using organotin (IV) materials in medications has brought significant attention by researchers recently. This is due to these compounds have demonstrated an excellent biological activity as well as organotin (IV) compounds are considers as anti-oxidant molecules as they work free radical scavengers. On the other hand, organotin (IV) complexes were used as photo-stabilizers for different types of plastic polymers. In this paper will review the most important potential work using organotin (IV) in both medicine and industrial applications.
Novel extracted natural stabilizer for the polymer was investigated in this study. The natural anti-aging was extracted from plants and it is demonstrated that this type of stabilizers are suitable for biodegradable polymers. Gynostemma pentaphyllum (0.01–0.03 wt%) were extracted and added to the poly(vinyl chloride) blend. The achieved polymeric films were exposed to an accelerated UV light aging process for 300 hours at ambient temperature. The efficiency of tested natural stabilizer was linked to blank PVC films. FTIR spectroscopy, weight loss, electronic microscope and scanning electron microscopy were performed. Using small amount of natural stabilizer is significantly beneficial because it does not influence the PVC properties.
The inhibition of the corrosion of Zinc in 2 M HCl by guaifenesin has been investigated at room temperature using weight loss measurements. Results obtained showed that guaifenesin is a good inhibitor and its inhibition efficiency (IE %) increased with the increase of inhibitor concentration since it was 81%. At 300 ppm.The surface coverage was 0.81 at 300 ppm inhibitor concentration; hence the optimum concentration was 300 ppm.Theoretical calculations investigate by studying the relationship between molecular structure and inhibition efficiency by using semi-empirical molecular quantum calculations within the PM3 method as implemented in HyperChem package.
New metal complexes of the ligand (Benzothiazol-2-ylsulfanyl)-acetic acid with the metal ions Fe(II), Mn(II), Co(II), Hg(II) and Cr(III) were prepared in alcoholic medium.The prepared complexes were characterized by FTIR Spectroscopy, electronic spectroscopy, elemental analysis, 1 H NMR, 13 C NMR, magnetic susceptibility. From the spectral measurements, monomer structures for the complexes were proposed.
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