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Titrimetric studies of Cu(II)-dimethylglyoxime complexes in solution.

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dc.contributor.author Hu, Qihua.
dc.date.accessioned 2012-07-09T20:20:00Z
dc.date.available 2012-07-09T20:20:00Z
dc.date.created 1992 en_US
dc.date.issued 2012-07-09
dc.identifier.uri http://hdl.handle.net/123456789/1794
dc.description x, 51 leaves en_US
dc.description.abstract This thesis describes investigations into the nature of the complexes formed between the copper(II) ion and dimethylglyoxime in solution. Titrimetric methods were employed. The pH and/or the absorbance of the solutions being titrated were monitored. When a copper(II) solution is titrated with sodium dimethylglyoximate (Na2dmg), a grey-green precipitate is formed and a sharp increase in pH occurs at a point corresponding to a Cu : dmg stoichiometry of 1 : 1. In the photometric studies, a buffered solution of Na2dmg was titrated with Cu(II), while monitoring the absorbance at 430 nm. A plot of absorbance against volume of titrant shows two points of discontinuity, one corresponding to a Cu : dmg ratio of 1 : 2 and a second at a Cu : dmg ratio of 2 : 1. This result is direct evidence for the existence not only of the well-known 1:2 complex but also of a previously unreported 2: 1 complex. A further investigation of the variation of absorbance with pH suggests that this 2:1 complex contains four copper atoms. Although the precipitate has a 1: 1 stoichiometry, and although other workers have postulated the existence of a complex of this composition in solution, no evidence for this complex in solution was found in these investigations. The resolution of this contradiction is a compelling motive for further investigations on this system. en_US
dc.language.iso en_US en_US
dc.subject Copper ions. en_US
dc.subject Copper compounds-Analysis. en_US
dc.title Titrimetric studies of Cu(II)-dimethylglyoxime complexes in solution. en_US
dc.type Thesis en_US
dc.college las en_US
dc.advisor William G. Davies en_US
dc.department physical sciences en_US

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