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Publications (5)21.89 Total impact

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    ABSTRACT: A salen ligand based Co(III) complex +/- with imprintable chiral memory was locked-in and used for stereoselective catalysis.
    Chemical Communications 02/2007; · 6.38 Impact Factor
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    ABSTRACT: Crystal structure and activation entropy data indicate that H-bond directed diaza-Cope rearrangement of chiral diimines takes place with a high degree of preorganization. CD spectroscopy and HPLC data show that there is inversion of stereochemistry for the reaction with excellent enantioselectivity.
    Journal of the American Chemical Society 12/2005; 127(47):16370-1. · 10.68 Impact Factor
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    Gamil Alhakimi, Lisa H. Studnicki, Muftah Al-Ghazali
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    ABSTRACT: The applicability of the photocatalytic detoxification for the treatment of Ras Lanuf Oil Co. (RASCO) wastewater was studied using potassium hydrogen phthalate (KHP) as a model compound. The conditions of the photocatalytic degradation process of KHP were optimised. Its disappearance in a titanium dioxide suspension, irradiated by sunlight, was followed by chemical oxygen demand (COD). The optimum catalyst concentration was found at 3 g/l of Degussa P25 and 10 g/l of Sachtleben Hombikat UV 100. The optimum degradation rate was obtained at pH 5.0 for both types of catalyst. The disappearance of KHP in the dark, using Sachtleben Hombikat UV 100, was due to the adsorption of the pollutant on the catalyst surface. The photonic efficiency was decreased at low light intensities (0.311–2.29 μmol photon s−1 l−1) with I−0.243 and at higher light intensities (2.29–2.919 μmol photon s−1 l−1) with I−0.94. The complete degradation of organic pollutants in RASCO wastewater was achieved after 5 h of irradiation using the optimised reaction conditions obtained for KHP.
    Journal of Photochemistry and Photobiology A Chemistry 01/2003; · 2.42 Impact Factor
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    Gamil Alhakimi, Saleh Gebril, Lisa H Studnicki
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    ABSTRACT: The comparison of the degradation of 4-chlorophenol, using sunlight and a UV-lamp, was carried out using two different catalysts, Degussa P25 and Hombikat UV 100. All experiments were performed after first optimizing the catalyst concentrations and pH. The optimal concentrations for Degussa P25 and Hombikat UV 100 occurred at 7 and 10 g/l, respectively. The optimal initial pH was found to be 5 for both catalysts. The degradation rate of 4-chlorophenol is 6.4 times and 1.6 times higher when using sunlight compared to the artificial UV-lamp for Degussa P25 and Hombikat UV 100, respectively. The degradation rate of 4-chlorophenol is six times higher, compared to Hombikat UV 100, at the optimal conditions, when using sunlight and Degussa P25 as the catalyst. The chloride produced during the reaction was measured and found to be highest for Degussa P25 with sunlight as the energy source.
    Journal of Photochemistry and Photobiology A Chemistry 01/2003; · 2.42 Impact Factor
  • Lisa Helen Studnicki
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    ABSTRACT: The discovery of metal-like conductivity in oxidized poly(acetylene), or shortly after in polyaromatic systems such as poly(pyrrole), poly(thiophene) or poly(aniline) in the late seventies and early eighties (1-6), has progressively generated a rich library of synthetic chemistry in the more general context of functional -conjugated systems. As for conductive polymers in general, the synthetic chemistry of linearly -conjugated systems has developed considerably over the past twenty years and has greatly diversified in terms of objectives and methods. In 1990, the realization of the first electroluminescent devices, in which a -conjugated polymer was used as a lumophore, represents a turning point in the field of -conjugated systems (7,8). This discovery, together with a parallel intensification of research on field-effect transistors (9,10), photovoltaic cells based on -conjugated polymers and oligomers (11-13), nonlinear optical materials (14), plastic solar cells (15-19) and optically pumped lasers (20) contributed strongly to build up a different vision of linear -conjugated systems.