• A crystallographic investigation of multidentate ligand hafnium(IV) halido complexes 

  Viljoen, Johannes Augustinus (University of the Free State, 2021-11)

  Hafnium, the chemical element with atomic number 72 in the titanium-triad on the periodic table, was first discovered by Dirk Coster and George von Hevesy in 1923 by analysing X-Ray spectra of Norwegian zircon samples (sea ...

• Struktuur en sintese van prorobinetinidien- en prosianidientipe gekondenseerde tanniene 

  Cronje, Annemarie (University of the Free State, 1992-02)

  Afrikaans: Die wye kommersiële toepassing van die 'Mimosa' ekstrak van die tannienryke bas van Acacia mearnsii het as stimulus vir die eerste fitochemiese ondersoek van die fenoliese komponente in die nywerheidsgedroogde ...

• Sintese en konformasie van natuurlike flobatanniene: die meganisme van basisgekataliseerde piraanherrangskikkings 

  Steynberg, Jan Petrus (University of the Free State, 1988-12)

  Afrikaans: Guibourtia coleosperma (Rhodesian copalwood) is bekend as 'n harde en duursame houtsoort wat opvallend weerstand teen verrotting bied. Die onlangse isolasie van unieke bi- en triflavanoïede gebaseer ...

• Modelverbindings in tanniensintese: die konformasie van vryfenoliese eenhede 

  Pretorius, Pierre Johann (University of the Free State, 1980-12)

  Afrikaans: Die basiese doelwitte van hierdie studie is essensieel tweërlei van aard naamlik: (i) fragmentering van die heterosikliese eterbinding in 'n flavan-3-ol, as model vir die fundamentele bousteen van tanniene, ...

• Profisetinidiene: die eerste sintese van tetraflavanoiede: bi- en triflavanoiede met terminale diolfunksie 

  Young, Desmond Austin (University of the Free State, 1984-01)

  Afrikaans: Chemici in die flavanoiedveld leun swaar op spektroskopiese metodes ter ontrafeling van die komplekse strukture van bi- en hoëre flavanoiede. Die kragtigste van hierdie tegnieke naamlik ultra-hoë resolusie 1H ...

• Development of bionanocomposites based on PCL/PBS double crystalline blends and carbon nanotubes 

  Gumede, Thandi Patricia (University of the Free State, 2018-08)

  The main purpose of this research was to use commercially available crystalline biobased polymers, namely poly(ε-caprolactone) (PCL) and poly(butylene succinate) (PBS), and introduce polycarbonate (PC)/multi-walled carbon ...

• Analysis of zirconium containing materials using multiple digestion and spectrometric techniques 

  Lotter, Steven James (University of the Free State, 2014-10)

  English: The preparation of pure zirconium metal for nuclear applications is difficult due to the non-reactivity of zirconium minerals, such as zircon. The ability to accurately analyse zirconium-containing materials across ...

• Comparison of the influence of CeYAG and MCM-41 as nanofillers on the properties of polycarbonate and poly( methyl methacrylate) 

  Sibeko, Motshabi Alinah (University of the Free State (Qwaqwa Campus), 2016-01)

  This study reports on the morphology of poly( methyl methacrylate) (PMMA) and polycarbonate (PC) filled with mesoporous silica (MCM-41) and cerium doped yttrium aluminum garnet (Ce:YAG) at contents in the range of 0.1 ...

• Totaalsintese en toksisiteit van 'n nuwe 12a-O-metielrotenoied: fitochemie van verwante isoflavonoiede 

  Oberholzer, Maria Elizabeth (University of the Free State, 1976-12)

  Afrikaans: Hierdie proefskrif behels die chemiese ondersoek van 'n reeks verwante natuurprodukte, waaronder 'n aantal fisiologies aktiewe rotenoïede, uit die bol van Neorautanenia amboensis. Tydens die ondersoek is daar ...

• Biflavonoied diastereo-isomere en hul biogenetiese voorlopers uit Berchemia SPP.: pogings tot sintese van analoe 

  Volsteedt, Francois du Rouan (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 ...

• Structural and chemical relationships in metal phosphine complexes relevant to homogeneous catalysis 

  Ndula, Bungu Peter (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 

  Gostynski, Roxanne (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 ...

• Flammability studies on biopolymers and their blends 

  Mngomezulu, Mfiso Emmanuel (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 

  Mokhena, Teboho Clement (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 

  Bekker, Riaan (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 

  Pieterse, Tanya (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 ...

• Encapsulation of selected metallated phthalocyanines in aluminium aminoterephthalate framework, NH₂-MIL-101(Al), with heterogeneous catalytic and hydrogen storage applications 

  Peens, Frederick Hermanus (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, ...

• Methanol carbonylation via platinum group metal complexes 

  Kotze, Philippus Daniel Riekert (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 ...

• 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 

  Tsai, Chih-Wei (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 

  Lamprecht, Delanie (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. ...

View more