https://vital.seals.ac.za/vital/access/manager/Index ${session.getAttribute("locale")} 5 Synthesis and characterisation of oxorhenium(V) and tricarbonylrhenium(I) complexes with biologically active N, O and N, S-Donor ligands https://vital.seals.ac.za/vital/access/manager/Repository/vital:10437 Wed 12 May 2021 23:34:13 SAST ]]> Synthesis and characterization of symmetrical and unsymmetrical ferrocenyl ligands for use in the preparation of Redox Active Ruthenium Alkylidene Complexes https://vital.seals.ac.za/vital/access/manager/Repository/vital:10403 Wed 12 May 2021 23:27:13 SAST ]]> Cytokine signalling functions of human soluble IgE receptors in peripheral blood mononuclear cells from normal and hyper-allergic individuals and in B-lymphoblastoid and monocytic cell lines https://vital.seals.ac.za/vital/access/manager/Repository/vital:10305 Wed 12 May 2021 20:16:17 SAST ]]> Studies towards the development of novel multidentate ligands https://vital.seals.ac.za/vital/access/manager/Repository/vital:4358 Wed 12 May 2021 20:02:38 SAST ]]> The development of amine-based extractants for separation of base metals in a sulfate medium https://vital.seals.ac.za/vital/access/manager/Repository/vital:4559 Wed 12 May 2021 19:26:07 SAST ]]> Curcumin analogues as ligands for Re (I) and (V) https://vital.seals.ac.za/vital/access/manager/Repository/vital:10443 Wed 12 May 2021 19:22:32 SAST ]]> Exploratory studies of novel ligand systems https://vital.seals.ac.za/vital/access/manager/Repository/vital:4315 Wed 12 May 2021 18:56:36 SAST ]]> Rhenium (I), (III) and (V) complexes with potentially multidentate N, O-Donor ligands https://vital.seals.ac.za/vital/access/manager/Repository/vital:10441 Wed 12 May 2021 18:40:36 SAST ]]> Synthesis, characterisation and biological activity of 2-(methylthiomethyl)anilines, 2-(methylthio)anilines, their Schiff-base derivatives and metal(II) (Co, Ni, Cu) complexes https://vital.seals.ac.za/vital/access/manager/Repository/vital:4562 Co(II) > Ni(II). The Schiff-base derivatives were prepared from the ligands and para-methoxysalicylaldehyde and their Cu(II) complexes were synthesized in order to determine their biological activity. The Schiff-base ligands were found to be less active than their parent ligands. The Cu(II) complexes are not soluble in water, DMSO or DMF, as a result and could not be evaluated for their biological activity. Based on the good results from the antimicrobial evaluation, the antiplasmodial activity of some of the Co(II), Ni(II) and Cu(II) complexes of the thiomethylated ligands against Plasmodium falciparum (FCR-3) was determined. At 50 μM concentration level, the Cu(II) complexes show activity equal or better than the prophylactic chloroquine. The Cu(II) complexes with the methoxy-substituted demonstrated exceptional activity but their Co(II) and Ni(II) analogues did not show any activity. The cytotoxicity of the active Cu(II) complexes at 50 μM concentration was determined against the breast cancer cell line (MDA-MB-231). The compounds destroyed the cancer cell in the range of 28–40%, thus showing their preferred activity against the parasitic cell instead of the cancer cell. The selectivity demonstrated by these compounds have shown them to be potential antimalarial agents and this could be further investigated.]]> Wed 12 May 2021 17:24:20 SAST ]]> The coordination chemistry of Rhenium(V) with multidentate no-donor ligands https://vital.seals.ac.za/vital/access/manager/Repository/vital:10370 Wed 12 May 2021 17:22:09 SAST ]]> Synthesis, crystal structures and molecular modelling of rare earth complexes with bis(2-pyridylmethyl)amine: aim topological analysis and ligand conformation search https://vital.seals.ac.za/vital/access/manager/Repository/vital:26229 Wed 12 May 2021 17:21:58 SAST ]]> Rhenium (I) and (V) complexes with potentially mulidentate ligands containing the Amino group https://vital.seals.ac.za/vital/access/manager/Repository/vital:10386 Wed 12 May 2021 16:31:06 SAST ]]> Synthesis, characterization and antimicrobial activity of copper (II) complexes of some hydroxybenzaldimines and their derivatives https://vital.seals.ac.za/vital/access/manager/Repository/vital:4534 Wed 12 May 2021 16:27:58 SAST ]]> The design and synthesis of multidentate N-heterocyclic carbenes as metathesis catalyst ligands https://vital.seals.ac.za/vital/access/manager/Repository/vital:4304 Wed 12 May 2021 16:08:21 SAST ]]> Synthesis, crystal structures and molecular modelling of rare earth complexes with bis(2-pyridylmethyl)amine and its derivatives : a quantum chemical investigation of ligand conformational space, complex intramolecular rearrangement and stability https://vital.seals.ac.za/vital/access/manager/Repository/vital:39517 Wed 12 May 2021 16:00:53 SAST ]]> Synthesis, characterization and antibacterial studies of metal complexes of substituted thiourea https://vital.seals.ac.za/vital/access/manager/Repository/vital:62636 Thu 16 Mar 2023 15:40:52 SAST ]]> Synthesis, characterization and biological evaluation of xanthate metal complexes https://vital.seals.ac.za/vital/access/manager/Repository/vital:62594 Thu 16 Mar 2023 10:05:53 SAST ]]> Effects of Axial Ligands on the Photosensitising Properties of Silicon Octaphenoxyphthalocyanines https://vital.seals.ac.za/vital/access/manager/Repository/vital:4553 600 nm) in dimethylsulphoxide solution. All the ligands were transformed into the dihydroxy silicon octaphenoxyphthalocyanine with varying degrees of phototransformation quantum yields ranging in order from 10⁻³ to 10⁻⁵ depending on the axial ligand involved. During and after axial ligand transformations a photodegredation of the dihydroxy silicon octaphenoxy phthalocyanine was observed upon continued irradiation. The oligomers were found to undergo the same axial ligand transformation process with a phototransformation quantum yield of 10⁻⁵ The singlet oxygen quantum yields of the unaggregated monomeric silicon octaphenoxy phthalocyanines were all found to be approximately 0.2 with the exception of a compound with two (trihexyl)siloxy axial substituents that had a singlet oxygen quantum yield of approximately 0.4 in dimethylsulphoxide solutions. The oligomers showed a surprising trend of an increase in singlet oxygen quantum yield with an increase in phthalocyanine ring number up to the pentamer and then a dramatic decrease to the nonamer. The triplet quantum yield and triplet lifetime were determined by laser flash photolysis for selected compounds and no correlation was observed with any of these properties and the singlet oxygen quantum yields. These selected compounds all fluoresce and a very good correlation was found between the fluorescence lifetimes determined experimentally by laser photolysis and the Strickler-Berg equation for the non-aggregated compounds. Electrochemical measurements also indicate the importance of the axial ligands upon the behaviour of the phthalocyanines as cyclic voltammetric behaviour was determined by the nature of the axial ligand.]]> Thu 13 May 2021 14:52:35 SAST ]]> Synthesis, characterisation and spectroscopic studies of diazine-N-oxide complexes of iron(II) towards the development of sensors https://vital.seals.ac.za/vital/access/manager/Repository/vital:31075 Thu 13 May 2021 08:45:50 SAST ]]> Reactivity of Rhenium (iii) and Rhenium (V) with multidentate NN-and no-donor ligands https://vital.seals.ac.za/vital/access/manager/Repository/vital:10373 Thu 13 May 2021 06:16:09 SAST ]]> Studies towards the synthesis of novel tridentate ligands for use in ruthenium metathesis catalysts https://vital.seals.ac.za/vital/access/manager/Repository/vital:4360 Thu 13 May 2021 06:16:05 SAST ]]> Synthesis and evaluation of PGM-selective ligands https://vital.seals.ac.za/vital/access/manager/Repository/vital:4450 Thu 13 May 2021 03:23:18 SAST ]]> Rhenium(V)-Imido complexes with potentially multidentate ligands containing the amino group https://vital.seals.ac.za/vital/access/manager/Repository/vital:10385 Thu 13 May 2021 00:14:50 SAST ]]> Group 12 metal chalcogenides as single source molecular precursors for the preparation of metal sulfide nanoparticles https://vital.seals.ac.za/vital/access/manager/Repository/vital:67295 Fri 01 Sep 2023 12:23:22 SAST ]]>