Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 42 for “"dithiocarbamate"”.
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On the synthesis, properties, and applications of metal dithiocarbamate complexes
Metal dithiocarbamate complexes possess many interesting and useful properties which has made them ubiquitous in the literature. Their discovery was early in the field of sulfur chemistry, with their applications as vulcanisation accelerators and fungicides being explored not long after. Nowadays, …
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Thiosemicarbazone, xanthate and dithiocarbamate single source precursors for cadmium, lead and indium sulfide nanoparticles
… oil. Different classes of ligands (xanthates and dithiocarbamates) were investigated on their influence in the properties of the nanoparticles, in addition to the choice of capping agent and reaction temperature. Two In(III) and two Cu(II) complexes were used in this work. Very few reports on the …
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The Determination of Lead and Cadmium in Tobacco Using High Performance Liquid Chromatography and Dithiocarbamate Derivitization.
… is capable of resolving lead and cadmium diethyldithiocarbamate complexes. The method does not require the presence of hazardous solvents to optimize peak shape and resolution; the mobile phase consists of methanol, water, and a surfactant. Tobacco samples were chemically oxidized and reacted …
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Application of impedance spectroscopy to the study of dithiocarbamate species on Au surfaces: Effects of aqueous Cu²⁺ and Mg²⁺ ions
<p>Self-assembled monolayers (SAM) of dithiocarbamate ligands were formed on the Au surface of an interdigitated electrode (IDE) array by reaction of amines with CS<sub>2</sub> in H<sub>2</sub>O/CH<sub>3</sub>OH solutions. Impedance spectroscopy was used to probe for the presence of each SAM as …
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Comparison of standard impedance spectroscopy response to aqueous metal ions using plain vs. surface derivatized gold interdigitated electrodes
… of an interdigitated electrode (IDE) through a dithiocarbamate linkage, resulting in significant changes in impedance response in the presence of Cu2+ solutions. However, questions regarding the stability of the primary amine-based dithiocarbamate self-assembled monolayer, reproducibility of the …
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Synergistic effects between thiol collectors used in the flotation of pyrite
… potassium n-butyl xanthate (PNBX) and cyclohexyl dithiocarbamate (cyclohexyl DTC) when a mixture of these collectors is used in the flotation of pyrite at pH =4 and, secondly, why synergistic effects are observed, if any. The focus of the investigation was a 90:10 mole ratio mixture of PNBX and …
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Reaction of CS2 and CO2 with Amidines and Guanidines
… an N-H bond allows the cyclic amidine to form a dithiocarbamate salt {[BH+] [(B-CS-2)-(H)]}, where B is the starting amidine, analogous to those formed by secondary amines [R2NH2][R2NCO2] and [R2NH2][R2NCS2] with CO2 or CS2, respectively. If the molecule does not possess an N-H bond then observed …
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Mono- and polynuclear Ferrocenyl-derived complexes: synthesis, characterisation and biological evaluation as antimycobacterial and antiplasmodial agents
… condensation reaction to afford a ferrocenyl dithiocarbamate. The dithiocarbamate was reacted with various amines via nucleophilic substitution reactions to give mono- and polynuclear ferrocenylthiosemicarbazone complexes. These complexes were isolated in low to moderate yields.
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Total synthesis of ferrugine and synthetic studies towards ferrugine and stemofoline
… radical, generated from a carbamoyl diethyldithiocarbamate, onto an unactivated pendant alkene, followed by group transfer of the dithiocarbamate moiety. The carbamoyl radical cyclisation precursor was synthesised from a known seven-membered ring carboxylic acid. The diastereomeric …
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The effect of mixing thiol collectors in the flotation of pure sulphide ores
… of xanthate with either dithiophosphate (DTP) or dithiocarbamate (DTC) has been reported to increase the flotation performance of several sulphide flotation operations. The increased flotation performance has often been termed synergistic. Synergism is defined as the effect exceeding the pro rata …
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Investigation of synthetic methods for preparation of 2<sup>o</sup>-amino derivatives of 5-amino- 1, 10-phenanthroline: Applications to Cu<sup>+2</sup> based impedance sensors
… binding properties to the gold surface through dithiocarbamate linkages by monitoring the IDE impedance signal. Practical sensor development requires good impedance response, maximum binding to the gold IDE chip, and maximum long term stability of the SAM, which provides the transducer element …
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Evaluating The Effectiveness Of Proprietary Additives In Improving Capture And Sequestration Of Oxidized Mercury In Scrubber Systems
… of the plant's scrubber slurry with diethyl dithiocarbamate (DEDTC).</p>
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Synthetic studies of heparan derivatives: Glycosyl couplings and post-glycosylative modifications
… epoxidation and ring opening by a dithiocarbamate auxiliary, which can be activated by copper(I) salts for carbon nucleophile addition with terminal L-<em>ido</em> configuration. We also explored stereoselective glycosylation of a novel glucosamine donor with a …
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Synthesis and Characterization of Bis-Phosphine Complexes with Transition Metals
… acids (N and O donors), polyamines (N donors), dithiocarbamate (S donors) and aminopolythias (N and S donors). The most extensively investigated types of macrocycles include crown ethers (O donors), thia crowns (S donors), aza crowns (N donors) and thiacrown ethers (S and O donors). A …
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Metal Complex Photo-activators for the Time-Controlled, Photo-Oxidation of Polyolefins
… of a photo-activator (ideal, e.g., iron dialkyldithiocarbamate (FDMC) and conventional, e.g., iron acetylacetonate (FAcAc)) and U.V. stabilizer, has been examined in both low-density polyethylene (LDPE) and polypropylene (PP). The U.V. stabilizers used were zinc and nickel …
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Synthesis and evaluation of novel polymer modifiers for biodegradable polymers
… a photoactivator such as iron (III) diisononyl dithiocarbamate. The mechanisms for the above processes are discussed. Finally, selected compounds were prepared on a pilot plant scale. Extruded and blown films were prepared containing these additives with conventional polymer processing …
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The use of mixed thiol collectors in the flotation of Nkomati sulphide ore
… ethyl dithiophosphate (DTP) or sodium ethyl dithiocarbamate (DTC) was used. The scope of this work was confined to the use of xanthates, DTC’s and DTP’s since they are in common use in industry, are supplied over a relatively low price range and have shown potential performance enhancements …
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Nickel and cobalt sulfide nanomaterials for magnetic and energy applications
… (5). These heterocyclic dithiocarbamate complexes have been characterised using common techniques such as Fourier Transform Infrared spectroscopy, elemental analysis and nuclear magnetic resonance spectroscopy. Nuclear magnetic resonance spectroscopy measurements were not …
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The development of nano-sized silicas as analytical tools
… silicas with groups such as mono- and diamines, dithiocarbamates, hydroxyquinoline, mercaptobenzamide and, for organic extractions, a mixed functionality diol and C18 modification. The nanoscavengers were characterized by Fourier transform infrared spectroscopy, scanning electron microscope, …
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An Examination of the Long-lasting Effects of Lipopolysaccharide-induced Sepsis on Cognitive and Affective Behaviour in Mice
… post-septic changes NF-κB inhibitor pyrrolidine dithiocarbamate was administered prior to sepsis induction which significantly improved outcomes in post-septic mice. To examine whether any intervention after sepsis onset could improve outcomes another experiment was conducted investigating the …
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