A5048547840- Organometallic Complex Synthesis and Catalysis
- Metal complexes synthesis and properties
- Molecular Junctions and Nanostructures
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Asymmetric Hydrogenation and Catalysis
- Ferrocene Chemistry and Applications
- Synthetic Organic Chemistry Methods
- Catalytic Processes in Materials Science
- Nanomaterials for catalytic reactions
- Advanced Chemical Physics Studies
- Magnetism in coordination complexes
- Electrochemical Analysis and Applications
- Catalysis for Biomass Conversion
- Catalysis and Hydrodesulfurization Studies
- Metal-Organic Frameworks: Synthesis and Applications
- N-Heterocyclic Carbenes in Organic and Inorganic Chemistry
- Chemical Synthesis and Analysis
- Corrosion Behavior and Inhibition
- Catalysis and Oxidation Reactions
- Ionic liquids properties and applications
- Nanocluster Synthesis and Applications
- Advanced Photocatalysis Techniques
- Porphyrin and Phthalocyanine Chemistry
- Electrocatalysts for Energy Conversion
University of the Free State
2014-2024
Clinvet
2017-2020
Eindhoven University of Technology
2012
Supercrowded 2,3,4,5-tetraferrocenylthiophene (4) has been synthesized by a fourfold Negishi ferrocenylation of tetrabromothiophene (3) with FcZnCl (2) (Fc = (η5-C5H4)(η5-C5H5)Fe) in the presence [(Ph3P)4Pd] as catalyst. The electronic and structural properties 4 were investigated UV−vis spectroscopy single-crystal X-ray diffractometry. Complex adopts solid-state structure, not one ferrocenyl substituents being coplanar thiophene ring. Cyclic, square wave, linear sweep voltammetry situ...
The ferrocenylthiophenes 2,3-Fc2-cC4H2S (9), 2,4-Fc2-cC4H2S (10), and 2,3,4-Fc3-cC4HS (11) have been prepared by a 2- or 3-fold Negishi cross-coupling reaction of the appropriate bromo thiophenes 5–7 with FcZnCl (8; Fc = Fe(η5-C5H4)(η5-C5H5)) in presence either [Pd(PPh3)4] [Pd(CH2CMe2PtBu2)(μ-Cl)]2 as catalyst. Concerning electron transfer studies on ferrocenyl-substituted aromatic heterocycles, electrochemistry well situ UV–vis–near-IR spectroelectrochemistry highlight electrochemical...
The group electronegativity of the R-groups ligand influences XPS binding energies and amount charge transferred in Mn 2p<sub>3/2</sub>photoelectron lines. DFT studies illustrated different Jahn–Teller elongation bond stretch isomers.
Zeolitic imidazolate frameworks (ZIFs), such as ZIF-8 and ZIF-67, were found to be efficient catalysts. However, ZIFs are not used much in photocatalysis due their low photocatalytic activity for most reactions. The can improved by modifying the framework exchanging Zn(II) ions (ZIF-8) Co(II) (ZIF-67) with a more photocatalytically active metal(II) ion form an bimetallic ZIF photocatalyst. Redox-active iron (Fe)-based materials known highly potent photocatalysts. Thus, incorporating into...
Abstract In low- to middle-income communities, the lack of affordability conventional sanitary products during menstrual cycles can cause psychological and health issues, ultimately affecting their quality life. It is crucial develop alternative that are affordable accessible all while also promoting hygiene. Super absorbent polymers (SAPs) a vital component in current disposable pads nappies. However, these SAPs often non-biodegradable non-biocompatible. Therefore, use eco-friendly...
The kinetics of dehydroxylation South African kaolin revealed that both the inner and surface hydroxyl groups disappear according to first order kinetics, however, group disappeared faster than groups, showing diffusion control is also important. temperature dependent transformations was measure by means fractional conversion ratios between AlO6:AlO4 Si-O-Al:Si-O-Si, which showed kobs values 0.0168 s-1 0.0089 for transformation spinel phase 0.0165 0.0156 mullite respectively. pozzolanic...
Reaction of [Mn3(OAc)6O·3H2O]+ (1) with ferrocenyl β-diketones the type FcCOCH2COR R = CF3 (2a) and CH3 (2b), Ph C6H5 (2c), Fc FeII(η5-C5H4)(η5-C5H5) (2d) yielded a series ferrocene-functionalized β-diketonato manganese(III) complexes 3a–3d, respectively, general formula [Mn(FcCOCHCOR)3]. The mixed-ligand complex [Mn(FcCOCHCOFc)2(FcCOCHCOCH3)] (4) was obtained by reacting mixtures diketones 2b 2d 1. A single-crystal X-ray structure determination 3b (Z 2, triclinic, space group P1̅)...
A series of ferrocenyl-functionalized β-diketonato manganese(III) complexes, [Mn(FcCOCHCOR)₃] with R = CF₃, CH₃, Ph (phenyl) and Fc (ferrocenyl) was subjected to a systematic XPS study the Mn 2p3/2 Fe core-level photoelectron lines their satellite structures. charge-transfer process from ligand Mn(III) metal center is responsible for prominent shake-up peaks 2p shake-down lines. Multiplet splitting simulations resemble calculated envelope Mn3+ ions well, indicating centers are in high spin...
Five different copper-oxide nanocrystals were prepared by colloidal synthesis to form either cubic, octahedral, rhombic dodecahedral, truncated or fluffy sphere structures. These Cu-oxide characterised using scanning electron microscopy, X-ray photoelectron spectroscopy, and UV-vis. The SEM images show that the Cu2O are relatively uniform all crystals have a particle mean diameter below 1000 nm. smallest is 411 nm for dodecahedral crystals, while octahedral crystal displays largest of 864...
Treatment of hydroxylated silica nanopowders S1 and allyl-functionalized S2 with 3-(diphenylborano)- or 3-bis(pentafluorophenylborano)propyltrimethoxysilane 2-(diphenylphosphino)- 2-(dicyclohexylphosphino)ethyltriethoxysilane generates nanopowder supported Lewis acids S3 bases S4. These surfaces were characterized by 13C, 11B, 31P cross-polarization magic angle spinning nuclear magnetic resonance (CP MAS NMR), X-ray photoelectron spectroscopy (XPS), attenuated total reflection Fourier...
Nonperipherally hexyl-substituted metal-free tetrabenzoporphyrin (2H-TBP, 1a) tetrabenzomonoazaporphyrin (2H-TBMAP, 2a), tetrabenzo-cis-diazaporphyrin (2H-TBDAP, 3a), tetrabenzotriazaporphyrin (2H-TBTAP, 4a), and phthalocyanine (2H-Pc, 5a), as well their copper complexes (1b–5b), were synthesized. As the number of meso nitrogen atoms increases from zero to four, λmax Q-band absorption peak becomes red-shifted by almost 100 nm, extinction coefficients increased at least threefold....