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Studies In Oxygenation And Oxidation Of Polyamine Cobalt Complexes Prepared By Solid State Reaction

Posted on:2009-02-17Degree:MasterType:Thesis
Country:ChinaCandidate:W WangFull Text:PDF
GTID:2121360245485894Subject:Applied Chemistry
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Oxygen carriers are proteins which can store or transport oxygen in organisms'bodies. Polyamine cobalt complexes are a kind of models of oxygen carriers. In this thesis, diethylenetriamine, triethylenetetramine, tetraethylenepentamine was respectively bound to cobalt nitrate, cobalt acetate by solid-phase reaction method at roomtemperature, thus six coordination compounds were obtained. They appeared a much higher oxygen absorption ability compared with the complexes prepared by liquid method. They can absorb more than 2 mole of O2 per mole complex. The changes of the complexes are characterized by IR and Raman spectra and it is considered that they had degraded gradually. It is presumed that superoxo complexes were formed at the first phase, and then the ligands and cobalt were oxidized. A simple and robust headspace gas chromatography (HSGC) method based on that the amount of nitrogen is a constant in a headspace vial, was proposed and validated to determine the binding-dioxygen in dioxygen complexes. It resulted in a good repeatability and accuracy after the mixed gases were separated and quantified. The gas produced by the acidified complexes was identified by HSGC and FT-IR mainly as CO2, not O2, and the addition of alumina produced more CO2 as well as NO2 was detected. It implied that the dioxygen activated by the cobalt oxidized the polyamine to decompose; in synergistic catalytic effect of alumina, the ligands were further oxidized.
Keywords/Search Tags:Polyamine cobalt complex, Solid state reaction, Headspace gas chromatography, Dioxygen complex
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