Now showing items 1-10 of 112
Method development for the quantification of selected early rare earth elements
(University of the Free State, 2015-01)
English: The aim of this study was to develop an analytical procedure to accurately quantify the early REE (La, Ce and Nd) in pure REE metal, in inorganic compounds as well as in a mixture containing all three elements ...
Synthesis, electrochemical, kinetic and thermodynamic studies of new ruthenocene-containing betadiketonato rhodium(I) complexes with biomedical applications
(University of the Free State, 2004-05)
English: New ruthenocene-containing β -diketones 1-Ruthenocenyl-4,4,4,-trifluorobutan-1,3-dione [Hrctfa, pKa / = 7.31(3)], 1-ruthenocenylbutan-1,3-dione [Hrca, pKa / = 10.22(4)] 1-ruthenocenyl-3- phenylpropan-1,3-dione ...
Variation in chemical composition of Harpagophytum species as function of age and locality
(University of the Free State, 2009-12)
English: Dried tubers, growing on secondary roots of Harpagophytum procumbens subsp. procumbens are widely used as an analgesic and anti-inflammatory medicine against arthritis and other chronic pain conditions. Tubers ...
Quantification of tantalum in series of tantalum-containing compounds
(University of the Free State, 2010)
The main objective of this research was firstly the successful digestion of a series of tantalum containing compounds, with specific exclusion of HF, and secondly, the accurate quantification of tantalum with the help of ...
Electrochemical and adsorption studies of a carboxylic acid-modified aluminium aminoterephthalate framework (H2N-MIL-53) with heterogeneous catalysis applications
(University of the Free State, 2015-08-19)
English: The Metal Organic Framework (MOF), MIL-53(Al) and its amine functionalised analogue, amino- MIL-53(Al) were synthesized in good yields (57 - 87%) and were employed as solid, porous support systems for the intrusion ...
Synthesis and characterisation of a selection of phthalocyanines covalently bonded to water-soluble polymers and a ferrocenyl fragment
(University of the Free State, 1998-06)
English: This thesis is concerned with the synthesis of phthalocyanine derivatives and their anchoring onto water-soluble polyaspartamides to produce compounds that may have biomedical applications, especially in the ...
Synthetic, electrochemical and kinetic studies of phosphinites and their rhodium(I) complexes
(University of the Free State, 2015-06-24)
English: Organophosphorus ligands of the type, C6H5XPPh2, where X = O, S and NH, meta- and para-Ph2POC6H4OPPh2, were synthesised by the reaction between chlorophenylphosphine and the desired phenyl substituent in the ...
Computational, structural and electrochemical properties of metal (III) tris-betadiketonato complexes
(University of the Free State, 2012)
English: A series of MnIII(β-diketonato)3 complexes (β-diketonato = acac, ba, dbm, tfaa, tfth, tffu, tfba and hfac) were synthesized and characterized with the aid of mass spectroscopy, elemental analysis, X-ray diffraction ...
Identification and quantification of impurities in zircon, PDZ and other relevant zirconium products
(University of the Free State, 2008-11)
Abstract not available
Ruthenium based homogeneous olefin metathesis
(University of the Free State, 2005-11)
English: The aim of this study was to investigate the decomposition of the methylidenes 4a [Ru(Cl)2(PCy3)2CH2] and 6 [Ru(Cl)2(PCy3)(NHC)CH2] and alkylidene 5 [Ru(Cl)2(PCy3)2CHR], formed in the homogeneous olefin metathesis ...