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    ABSTRACT: The effect of Variamine Blue B (4-Amino-4’-Methoxydiphenylamine-Diazonium Chloride, VBB) on the corrosion of Cu-35Zn alloy (brass) in 3.5% NaCl medium was studied at different concentrations and temperatures. For this purpose, electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization techniques were used as electrochemical techniques. Scanning electron microscopy (SEM) and attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR) was used as optical techniques to investigate the brass surface. According to experimental results, inhibitor effectiveness increased with increasing temperature and VBB reduced the corrosion rate by acting as a mixed type inhibitor. The activation energy (Ea) of the dissolution process and the standard free energy values ΔGoads of the adsorption process showed that chemical interactions also had a minor contribution to the adsorption of VBB on brass surface while physical interactions had a major one. Electrochemical and optical results revealed that VBB molecules held persistently on brass surface even after 120 hours. The existence of VBB on brass surface was verified experimentally by ex-situ ATR-FTIR spectroelectrochemical measurement.
    Arabian Journal of Chemistry 02/2015; 52. DOI:10.1016/j.arabjc.2015.02.007
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    ABSTRACT: Optically pure diols (I) catalyze the addition of diethylzinc to aromatic aldehydes to give the corresponding alcohols with up to 99% enantiomeric excess.
    Tetrahedron Letters 09/2014; 55(16). DOI:10.1002/chin.201439031
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    ABSTRACT: In this study, we described the syntheses of new zinc(II) phthalocyanine compounds derived from (1R,2R)-1,2-diphenyl-1,2-ethanediol units. The phthalonitrile precursors 3 and 4 were synthesized by the reaction of 4,5-dichlorophthalonitrile with (1R,2R)-1,2-diphenyl-1,2-ethanediol. The synthesis of zinc(II) phthalocyanine 5 and zinc(II) phthalocyanine polymer 6 by cyclotetramerization of corresponding phthalonitrile derivative were accomplished in the presence of Zn(CH3CO2)(2) in a Schlenk tube containing quinoline under nitrogen atmosphere. The zinc(II) phthalocyanine 5 showed enhanced solubility in various organic solvents. The aggregation behavior of phthalocyanines was investigated at different concentrations in different solvents. Both phthalocyanines were found to exist in non-aggregated form at concentrations between 10 x 10(-6) and 1 x 10(-6) mol dm(-3). As the concentration increased to 5 x 10(-5) mol dm(-3), a deviation from ideality was observed for both phthalocyanines. The novel compounds were characterized by a combination of elemental analysis and H-1 NMR, C-13 NMR, IR, UV-Vis and MS spectral data.
    Journal of Molecular Structure 03/2014; 1067. DOI:10.1016/j.molstruc.2014.03.037


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