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Showing 1 to 20 of 44 for “"tris(2"”.
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Quenching of the Fluorescence of Tris (2 2-Bipyridine) Ruthenium(II) [Ru(bipy)3]2+ by a Dimeric Copper(II) Complex.
<p>The quenching of the [Ru(bipy)<sub>3</sub>]<sup>2+</sup> by Cu<sub>2</sub>L<sup>2+</sup> was studied and the data were plotted with the Stern-Volmer equation. The plot showed a break and was divided into 2 regions, <0.5 and >0.5 Cu<sub>2</sub>L<sup>2+</sup>: [Ru(bipy)<sub>3</sub>]<sup>2+</sup> …
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Synthesis of novel pendant arm macrocyclic ligands as potential models for enterobactin
A series of pendant arm tris-catecholate macrocyclic ligands were synthesized. The first, based on 1,4,7- triaminopropyl-1, 4, 7-triazacyclononane, was prepared via condensation with 2,3-dimethoxybenzoyl chloride. The deprotection of the catechol moieties was achieved with boron tribromide in 80% …
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Natural attenuation of organophosphates in river systems: Chattahoochee River case study
… acid triesters, tributyl phosphate (TBP), tris(2-chloroethyl) phosphate (TCEP), and tris(2-butoxyethyl) phosphate (TBEP) have been detected in surface waters across the world, primarily the result of sewage treatment plant discharge. Despite concentrations as low as a few parts per …
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Tripodal Inorganic 2-Pyridyl-phosphine Ligands and Unsymmetrical Analogues: Towards New Applications in Catalysis
… together with the applications of phosphine and tris-2-pyridyl ligands in catalysis which are relevant to the studies undertaken in the thesis. This chapter finishes with a statement of the aims of the thesis. Chapter 2 focuses on sterically-constrained C3-symmetric tris-2-pyridyl ligands and the …
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Emulsion-Templated Porous Polymers as Support Materials for Covalent Enzyme Immobilization
… were functionalized post-polymerisation with tris(2-aminoethyl)amine, morpholine and O,O’-bis(3-aminopropyl)polyethylene glycol. The functionalization of these GMA-based materials was observed via a number of analysis techniques, such as FT-IR spectroscopy, XPS spectroscopy, elemental …
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Syntheses of novel acyclic amino-amido ligands
… novel trioxo heptaamine ligand N,N' ,N''-tris[2-(N'',N''-dimethylamino)ethyl]nitrilotriacetamide hydrochloride (86a) is also described. An investigative study towards the assembly of a novel triamine system for encapsulating NMR or isotopic NMR-active metal ions for possible use in …
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Influence of alloy metal nanoparticles on the fluorescence properties of a ruthenium complex
… fluorescence properties of the fluorescent dye, tris (2, 2’ – bipyridine) ruthenium (II) [Ru(bpy)<sub>3</sub>]<sup>+2</sup>. The dye showed fluorescence quenching by the gold, silver, and alloy nanoparticles. This extent of quenching, which is most pronounced in the alloys, can be attributed to …
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Biomimetics and Host-Guest Chemistry
… active zinc center, three families of tris(2-pyridyl)methanol derivatives were synthesized and characterized. Zinc binding studies revealed that the binding behaviors of the ligands depended on the steric and electronic properties of the substituents on the pyridyl rings, as well as the …
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Characterization of 2-methyl-8-quinolinolato gallium (Iii) chelates
… These materials are compared with aluminum (III) tris(8-quinolinolato) (Alq3) chelates. We show that regardless of changing the carboxylato ligand the 2Meq2 GaOR chelates have similar unoccupied (LUMO) states. This implies that charge injection should be constant in these materials when used as …
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Synthesis, structure and chirality of some neutral cobalt (III) complexes
… S-serine. A convenient, high yield synthesis of tris(2 ,4-pentanedionato)-rhodium(III) is reported.</p>
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Influence of metal nanoparticles on fluorescence properties
… various sizes on the fluorescence properties of tris (2, 2-bipyridyl) dichloro ruthenium (II) hexahydrate (Ru (bpy)3 2+), tryptophan and phenylalanine. For (Ru (bpy)3 2+) absorbed on silver and gold nanoparticles, the fluorescence intensity was quenched and showed a significant increase in the …
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Polymeric Chemisorbents for Organic Acid Recovery from Aqueous Solution
… of N,N-dimethylaminoethylacrylamide (DMEA) and tris[2-(acryloylamino)ethyl]amine (TAAEA). Both sorbents successfully chemisorb succinic acid from dilute aqueous solution with efficiencies that are competitive to polymeric chemisorbents that are reported in literature. Novel recovery methods that …
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Trigonal Based Copper Sites - A Natural Situation?
… are derived from the condensation of tris(2- aminoethy1)amine (tren) or tris(3-aminoisopropy1)amine (trpn) and a range of aromatic aldehydes. The compounds invariably co-ordinated Cu(1) and the structural consequences of the flexibility are examined and systematised. Their redox …
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Mono- and polynuclear Ferrocenyl-derived complexes: synthesis, characterisation and biological evaluation as antimycobacterial and antiplasmodial agents
… ferrocenyl-derived imino complexes based on the tris(2-aminoethyl)amine scaffold and the polypropyleneimine (PPI) first- and second-generation scaffolds were also synthesised using Schiff-base chemistry. These polynuclear complexes were prepared using template chemical procedures to that of the …
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Binding and Detection of Anions Using Tripodal Hosts
… and flexible organic frameworks based on the tris(2-aminoethyl)amine (tren) precursor, conformationally-restricted and brightly coloured aromatic species based on the dye pararosaniline, and triply-ligated metal complexes of ruthenium(II). In order to assess the anion binding abilities of …
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Studies of Some Co-Ordination Compounds of Iron and Cobalt
… of this thesis is the study of the behaviour of tris 2-2' bipyridyl iron II cation in strongly acidic media. It is shown that the tris 2-2' bipyridyl iron II perchlorate is completely dissociated in concentrated hydrochloric acid to monoprotonated bipyridyl and chloro-ferrate. The pale blue …
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Reactivity of rhodium-heteroatom bonds: from catalytic bond activation to new strategies for olefin functionalization
… intermediates. [Tp*Rh(PPh3)2] [Tp* = hydrotris(3,5-dimethylpyrazolyl)borate] and [Tp*Rh(cod)]2 (cod = cyclooctadiene) were evaluated for their activity in alkyne hydrophosphinylation in comparison to known catalysts for this reaction. [Tp*Rh(PPh3)2]and [Tp*Rh(cod)]2 were both shown to …
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Structure-property relationships and salt selection for functional organic materials
… Rhodamine B-NPOH(MeCN)2 ,tris-2-amino-ethylenetriamine-NPO(H2O)2, isopropylamine-NPO(H2O) and 1,4-diaminobutane-NPO.;These 13 structures were compared to 50 structures containing NPOH or NPO found on the Cambridge Structural Database (CSD).;Hydrogen bonding and other …
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THE IDENTIFICATION AND QUANTIFICATION OF ORGANOPHOSPHATE FLAME RETARDANTS IN RAW MATERIALS UTILIZED IN POLYURETHANE PRODUCTION
… triethyl phosphate, triphenyl phosphate, and tris(2-chloroethyl) phosphate. To identify the individual components of a flame retardant blend, methods of quantification and qualification were developed using analytical instrumentation, specifically gas chromatography coupled with triple …
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Main Group Elements in Catalysis: Alkene/Alkyne Activation Using Organoaluminium(III)–Pyridyl Dimers
… the last chapter, the coordination behaviour of tris-(2-Me-6-qyinolyl) and tris-(5-quinolyl) ligands containing Sb and Bi bridgehead atoms with a range of transition metals is explored, for assembly into supramolecular structures and as potential ligands for new catalytic systems.
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