Thesis (MSc (Chemistry and Polymer Science))--University of Stellenbosch, 2007. / A comprehensive, comparative structural study of gold(I), gold(II) and gold(III)
compounds with the general formula [Aux(C6F5)y(tht)z] (tht = tetrahydrothiophene) was
performed. The series of compounds included the unprecedented dinucleur gold(II)
compound, tetrakis(pentafluorophenyl)bis(tetrahydrothiophene)digold(II), which could be
prepared in a rational manner. This very unique compound represents the first example of
an unbridged dinucleur gold(II) compound in which the gold(II) centres are not stabilised
by chelating ligands. Formation of this compound was postulated to have taken place by
radical pentafluorophenyl (pfp) ligand migration along with AuII–AuII bond formation. It
may therefore be regarded as a rare example of labile behaviour by a generally inert pfp
ligand. In addition to this compound, the crystal and molecular structures of the wellknown
gold(I) and gold(III) precursor compounds, (pentafluorophenyl)(tetrahydrothiophene)
gold(I) and tris(pentafluorophenyl)(tetrahydrothiophene)gold(III) were carried out
and are described for the first time. The latter underwent a unique mononuclear ligand
rearrangement (metathesis or disproportionation) reaction in solution to yield the novel
rearrangement product, bis(pentafluorophenyl)bis(tetrahydrothiophene)gold(III)tetrakis-
(pentafluorophenyl)gold(III). In all the complexes, the Au–C and Au–S bond lengths
displayed a variation which appears to be dependent on the oxidation state of the central
gold atom. Both of these bond types were found to descrease in the order Au(II) > Au(III)
> Au(I)...
| Identifer | oai:union.ndltd.org:netd.ac.za/oai:union.ndltd.org:sun/oai:scholar.sun.ac.za:10019.1/1702 |
| Date | 03 1900 |
| Creators | Coetzee, Jacorien |
| Contributors | Cronje, S., Raubenheimer, H. G., University of Stellenbosch. Faculty of Science. Dept. of Chemistry and Polymer Science. |
| Publisher | Stellenbosch : University of Stellenbosch |
| Source Sets | South African National ETD Portal |
| Detected Language | English |
| Type | Thesis |
| Format | 2443802 bytes, application/pdf |
| Rights | University of Stellenbosch |
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