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The structure and synthesis of trimeric and related dimeric Proteracacinidins from Acacia heteroensis.
(University of the Free State, 2002-07)English: The presence of 4', 7,8-trihydroxyl substituted flavanoids in plant material is limited to Acacia galpinii and Acacia caffra in Southern Africa. The existence of pyrogallol-type A-ring oligomers in these trees was ... -
The structure and synthesis of trimeric and related dimeric Proteracacinidins from Acacia heteroensis.
(University of the Free State, 2002-07)English: The presence of 4', 7,8-trihydroxyl substituted flavanoids in plant material is limited to Acacia galpinii and Acacia caffra in Southern Africa. The existence of pyrogallol-type A-ring oligomers in these trees was ... -
Sintese en struktuur van Pirano-isoflavanoïede
(University of the Free State, 1977-01)Afrikaans: Die medisinale gebruik (waarskynlik as antiseptikum) van die bas van Dalbergia nitidula Welw. ex Bak. (Leguminosae) deur inboorlinge het tot die huidige chemiese ondersoek aanleiding gegee. Hierdie ondersoek ... -
Biflavonoied diastereo-isomere en hul biogenetiese voorlopers uit Berchemia SPP.: pogings tot sintese van analoe
(University of the Free State, 1976-02)Afrikaans: Hierdie studie behels die struktuurondersoek, omskakelingsreaksies en pogings tot sintese van sommige van die mono- en biflavonoïede uit die kernhout van Berchernia zeyheri met 'n aanvullende studie op die ... -
Iridium carbonyl complexes as model homogeneous catalysts
(University of the Free State, 2010-05)English: The aim of this study was to investigate model iridium carbonyl complexes as homogeneous catalyst precursors for processes such as olefin hydroformylation. The hydroformylation of alkenes is one of the most ... -
Structural and chemical relationships in metal phosphine complexes relevant to homogeneous catalysis
(University of the Free State, 2010-03)English: The aim of this research work was to improve the fundamental understanding of the role selected tertiary bicyclic and conventional phosphine ligands play in modified cobalt-catalyzed hydroformylation. Selected ... -
Computational and characterization studies of homogeneous and heterogeneous tris(beta-diketonato) complexes with catalytic applications
(University of the Free State, 2017-06)English: Nine [Mn(β-diketonato)3] [β-diketonato = dipivaloymethanato (dpm), 1; acetylacetonato (acac), 2; benzoylacetonato (ba), 3; dibenzoylmethanato (dbm), 4; trifluoroacetylacetonato (tfaa), 5; thenoyltrifluoroacetonato ... -
Synthesis, chemical kinetics, thermodynamic and structural properties of phenyl-containing beta-diketonato complexes of rhodium (I)
(University of the Free State, 2007-01)Abstract available in full text PDF -
Flammability studies on biopolymers and their blends
(University of the Free State (Qwaqwa Campus), 2016-01)The effect of commercial expandable graphite (EG) on the flammability and thermal decomposition characteristics of two systems based on poly(lactic acid) (PLA) and poly(lactic acid)/poly(ε-caprolactone) (PLA/PCL) blend was ... -
Properties evaluation of electrospun alginate-based nanofibrous membranes for filtration applications
(University of the Free State (Qwaqwa Campus), 2016-12)This study entails the electrospinning of a sodium alginate (SA) natural polymer with the aid of an electrospinnable synthetic polymer, polyethylene oxide (PEO), in order to develop nanofibrous-based membranes for wastewater ... -
The constitution of oligomeric benzofuranoids
(University of the Free State, 1999-05)English: Berchemia zeyheri is known for its unique red heartwood, a property that was probably responsible for the first phytochemical investigation into the flavonoid content of this tree. The heartwood contains a unique ... -
New ring closing metathesis based methodology for the synthesis of monomeric flavonoids
(University of the Free State, 2017-02)Although the physiological activity of flavonoids stimulated investigations into more efficient synthetic methods for the preparation of these compounds, many of these routes entail multiple steps and require the utilization ... -
Multiple chromisms associated with dithizone
(University of the Free State, 2016)Ever since discovery of the intensely colored dithizone ligand, H2Dz, in the late 1800s it had been used extensively in aqueous solution trace metal analyses. However, hardly any effort had gone into developing the ... -
Improvement of thermo-switch properties in polyolefin/carbon black composites through the addition of wax
(University of the Free State (Qwaqwa Campus), 2016-03)Conductive polymer composites (CPCs) based on LDPE, HDPE and iPP filled with carbon black (CB) and Zn micro-particles and blended with medium-soft wax were studied. The aim of this study was to investigate the effect of ... -
Encapsulation of selected metallated phthalocyanines in aluminium aminoterephthalate framework, NH₂-MIL-101(Al), with heterogeneous catalytic and hydrogen storage applications
(University of the Free State, 2017-01)English: The amine-functionalised metal organic framework (MOF), NH2-MIL-101(Al) was successfully synthesised and optimised with a benchtop method. A newly developed activation method to evacuate the pores of the MOF, ... -
The preparation and characterisation of nano-metal hexacyanoferrates with a potential catalytic application
(University of the Free State, 2016-12)English: A series of bulk and nano-sized metal hexacyanoferrates (KMy[Fe(CN)6]z·qH2O, M = Fe, Co, Ni and Cu) were prepared by a co-precipitation and reverse emulsion reaction, respectively. The yields obtained were ... -
Methanol carbonylation via platinum group metal complexes
(University of the Free State, 2010-11)The aim of this study, firstly, involved the synthesis of a range of S,O-functionalized thiourea ligands with systematically changing electro-steric properties and investigate these ligands coordination modes to rhodium ... -
Synthesis and characterization of 3,3”-dihydroxy-[1,1’:4’,1”-terphenyl]-4,4”- dicarboxylic acid derivatives as precursors for functionalized Co-MOF-74-III materials
(University of the Free State, 2017-01)English: A series of new 4,4”-di[methoxyethoxymethoxy]-[1,1’:4’,1”-terphenyl]-3,3”-di[methoxyethoxymethoxycarbonyl] derivatives were synthesised as possible linkers for MOF-74-III derivatives. The following products were ... -
Modification of nano-sized zinc zeolitic 2-methylimidazolate frameworks (zif-8) by solvent assisted ligand exchange and post-sythetic modification to enhance functionality towards catalysis, gas storage and drug delivery
(University of the Free State, 2017)English: Zeolitic Imidazolate Framework-8 nanoparticles (nZIF-8) were successfully synthesized during isothermal benchtop reactions, with different reagent concentrations in methanol. At an optimal concentration, an ... -
Electrochemical, kinetic and molecular mechanic aspects of Rhodium(I) and Rhodium(II) complexes
(University of the Free State, 1998-11)English: Four Rh(I)(β-diketonato)(CO)(PPh3) complexes, in which the β-diketone has different electronegativities and steric hindrances, were successfully synthesised and characterised by means of Infrared and NMR spectroscopy. ...
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