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Showing 1 to 20 of 82 for “"Phosphonium"”.
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Molecular Solvation in Phosphonium Ionic Liquids
… in an environmentally-friendly room temperature phosphonium ionic liquid (RTPIL) solvent. With virtually no vapor pressure, ILs are attracting attention as potential “green” replacements for conventional volatile organic solvents. ILs are also known for chemical stability, non-flammability and …
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Selective functionalization of azines via phosphonium salts
… are increasingly valuable. We have shown that phosphonium salts can be formed on a range of azines, including complex biologicallyactive compounds. Additionally, these azinyl phosphonium salts serve as a general functional handle to facilitate a variety of bond formations. Chapter 2 focuses on …
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Phosphonium-functionalised gold nanoparticles for mitochondria targeted therapeutics.
… zwitterions and w-thioacetylpropyl(triphenyl)phosphonium salts can be used to prepare cationic, water-soluble gold nanoparticles with mean core sizes in the range of 2.5-5 nm. Phosphonium-functionalised gold nanoparticles have been characterised by a number of techniques including NMR, LDI-MS, …
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Palladium Catalyzed Hydrodechlorination of 4-Chloroanisole in Phosphonium Ionic Liquids
… 7a (trihexyl(tetradecyl)phosphonium chloride), and 7b (trihexyl(tetradecyl)phosphonium bis(trifluoromethylsulfonyl)imide) (Scheme 9). Additionally, this thesis focuses on improving the logistical aspects of determining the water content in the ILs, sampling reactions to …
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Arsonium and phosphonium-functionalized gold nanoparticles for mitochondria targeted therapeutics
… and biological properties of novel arsonium- and phosphonium- alkylthiosulfate zwitterions and thioacetate salts and gold nanoparticles functionalized with triphenylarsoniumpropylthiolate ligands. Chapter 1 presents a systematic literature review of the preparation of functionalized gold …
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Synthesis and Non-Covalent Interactions of Novel Phosphonium-Containing Polymers
Phosphonium ions readily compare to ammonium ions in regards to their aggregate characteristics, thermal stability, and antibacterial activity. Ionic aggregation in phosphonium-based polymers provides thermoreversible crosslinks, ideal for reversible self-assembly, self-healing, and smart response. …
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The Synthesis and Characterization of Phosphonium Indenylide Complexes of Ruthenium(II)
Phosphonium indenylides (PHIN) are a promising, yet relatively unexplored class of transition metal ligands. The ylidic resonance structure b of this compound is isoelectronic with the cyclopentadienyl ligand which is ubiquitous throughout organometallic chemistry. Phosphonium indenylides have been …
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Thermodynamic properties of phosphonium-based ionic liquid mixtures at different temperatures
Submitted in the fulfillment of the academic requirements for the degree of Masters of Applied Science in Chemistry, Durban University of Technology. Durban, South Africa, 2018.
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Novel chiral phosphonium ionic liquids as solvents and catalysts for cycloadditions. Investigation of the Diels-Alder reaction of a series of dienes and dienophiles in novel chiral phosphonium ionic liquids.
… has been paid to the scope and limitations of phosphonium ILs (PILs). Therefore the focus of this thesis is the synthesis and application of novel chiral PILs as environmentally benign, task-specific solvents for the Diels-Alder reaction. In addition, this research seeks alternative ways to …
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From N to P: Examining Structure-Property Relationships of Ammonium- and Phosphonium-Containing Macromolecules
… comprehensive study of ammonium and phosphonium polyelectrolytes probed and examined structure-property relationships with a focus on different macromolecular properties. Conventional free radical polymerization readily generated a large library of ammonium- and phosphonium-containing …
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Understanding the electrification-driven lubrication mechanism of phosphonium ionic liquids to enhance the degradation resistance of electric vehicle components
… an alternative, conductive lubricants, such as phosphonium based room temperature ionic liquids (PRTILs) could be utilized. However, the ionic nature of PRTILs could be detrimental to the surface due to corrosion, which can accelerate the overall material loss under sliding interaction. Till …
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Structural studies of imidazolium and phosphonium cations with aprotic hetero cyclic anions (AHAs) and investigation of electrochemical CO₂ reduction
… In this study, we have selected imidazolium and phosphonium cations with good fluidity and thermal stability, pairing them with AHAs with varying basicity and geometry. We investigated the effect of hydrogen bonding in the selected ILs on chemical and physical properties by measuring and …
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Synthesis and Characterization of Cation-Containing and Hydrogen Bonding Supramolecular Polymers
… including nucleobase hydrogen bonding and phosphonium/ammonium ionic aggregation were studied in block and random polymers synthesized using controlled radical polymerization techniques such as nitroxide mediated polymerization (NMP) and reversible addition-fragmentation chain transfer …
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Functionalised metal nanoparticles as novel reagents for biomedical analysis.
… and -selenolate compounds bearing a phosphonium (or phosphine oxide) head group, and the applications as ligands for the stabilisation of gold nanoparticles. The ability of these cationic phosphonium gold nanoparticles as substrates for the detection of negatively charged biomolecules …
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Functional Block Copolymers via Anionic Polymerization for Electroactive Membranes
… copolymers containing n-butyl acrylate and phosphonium ionic liquids. These compositions incorporated vinylbenzyl triphenyl phosphonium and vinylbenzyl tricyclohexyl phosphonium cations bearing chloride (Cl), or bis(trifluoromethane sulfonyl)imide (Tf2N) counteranions. Differential scanning …
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Designing Multiphase Step-Growth Polymers for Advanced Technologies: From Electromechanical Transducers to Additive Manufacturing
… polyester resins (UPR). Incorporating a phosphonium ionic liquid as a reactive diluent replaced styrene and reduced the volatility of commonly used UPRs. VP successfully provided 3D structures from these UPRs that demonstrated limited ionic conductivities. An extensive review of the …
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Ionic liquid electrochemical processing of reactive metals
… than current industrial practice. Tetra-alkyl phosphonium ILs are on the low end of the IL cost spectrum and are regarded as understudied compared with imidazolium and pyridinium ILs. They are also known to be more thermally stable. The density, viscosity and conductivity of the phosphonium ILs …
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Preparation and Characterisation of Ionic Liquids and Investigations into their Potential use in the Absorption and Sequestration of Carbon Dioxide
… based, with the latter category based on the phosphonium cations. The first category consist of cations which contain two N-heterocyclic rings and these are combined with a range of conventional anions such as bis(triflimide) and dicyanamide. The second category utilise the same cations but …
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