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Showing 1 to 19 of 19 for “"Copper Complex"”.
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Development of an antirheumatic drug
… spectrometry. The stability constants of the complexes of Mg, Ca, Zn and several first transition metal-ions with the ligands were determined potentiometrically. The solution conformation of the CuII complexes were determined using visible spectrophotometry. Finally the physico-chemical …
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The modification of brucine derivatives as chiral ligands and its application in the asymmetric synthesis
… aryl vinyl ketones.^ In Chapter 3, brucine diol-copper complex catalyzed asymmetric conjugate addition of glycine (ket)imines to nitroalkenes is discussed. Stereodivergent catalytic asymmetric conjugate reactions for glycine (ket)imines with nitroalkenes were achieved using various chiral …
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Spectroscopic Examination of the Catalytic Decomposition of hydrogen Peroxide by a Copper (II) Complex of a Dissymmetric Schiff Base and an Imidazole Derivative.
<p>Previous studies involving copper (II) complexed with a dissymmetric Schiff base and imidazole derivatives had identified catalase activity of these complexes towards H<sub>2</sub>O<sub>2</sub>. Reactions such as this are of great interest due to the important role of copper-based complexes in …
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Copper at the Interface of Chemistry and Biology: New Insights into hCtr1 Function and the Role of Histidine in Human Cellular Copper Acquisition
<p>Mechanisms of copper homeostasis are of great interest partly due to their connection to debilitating genetic and neurological disorders. The family of high-affinity copper transporters (Ctr) is responsible for extracellular copper acquisition and internalization in yeast, plants, and mammals, …
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The reaction between ferrocytochrome c and hydrogen peroxide
… in fitting a suitable reaction mechanism. Copper ions have been found to catalyse reactions similar to that studied here. The effect of a copper histidine complex was therefore investigated on the reaction at pH 8.7. The copper complex was found to catalyse the oxidation of ferrocytochrome …
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Functionalization and applications of carbon nanotubes
… that are non-covalently functionalized with a copper complex. The device shows good sensitivity and selectivity for ethylene and could be useful in the horticultural industries.
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The preparation and study of alkylated phosphazenes
… in some detail. These reactions are quite complex yielding substitution products as well as degradation products. The reaction of alkyl Grignard reagents, in the presence of a copper complex ((n-Bu₃PCuI)₄), have been studied and produce good yields of mono- and di-alkylated …
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Crystal field aspects of the vibrational spectra of some metal complexes of tropolone and nitrogen donor ligands
… has been extended here to metal tropolonate complexes. The crystal field trends have been used to assist in the assignment of metal sensitive vibrations to the transition metal tropolonate complexes. A study has been made of the effects of spin state and Jahn-Teller distortion on the …
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Characterizing Ultrafast Equilibrium Dynamics Using Third-Order Nonlinear Mid-Infrared Spectroscopies
… on the ultrafast dynamics of a series of copper complexes were investigated. An azide group was attached to model copper complexes to serve as a vibrational probe. It was found that the peripheral phosphinimine ligands of the copper complex confined the orientational motion of azide and …
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Tetraazamacrocyclic ligands and their copper complexes
… new types of tetraazamacrocycles and their copper(ll) complexes are described. Condensations of 4,8-diaza-2,3:9,10-dibenzoundecane-1,11-dione with a range of aliphatic and aromatic diamines has allowed the isolation of metal-free diimine macrocycles without recourse to metal template' or …
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Structural variations in metal ion complexes of the ligand EGTA⁴-
Structural studies of several metal ion complexes with the tetraanion of the octadentate ligand, H^4EGTA (3,12-bis(carboxymethyl)-6, 9-dioxa-3, 12-diazatetradecanedioic acid), as well as the structure of H^4EGTA, have been performed by single crystal X-ray diffraction. Of particular interest was …
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Synthetic, structural, and stability studies of metal complexes of cross -bridged tetraamine macrocycles
… the Weisman-Wong research group to selectively complex small metal ions such as Li+ in a cis-folded configuration. Cu(II), Ga(III), and In(III) complexes of these cross-bridged ligands have potential radiometal-based pharmaceutical applications due to their high kinetic stabilities. Cu(II) …
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Complexing Carbon Nanomaterials and Reactive Metal Species for Selective Chemical Sensing and Tunable Catalysis
… Polymer/Single-Walled Carbon Nanotube Complexes and their applications in the selective detection of benzene, toluene, and o-xylene using chemiresistive and quartz crystal microbalance-based methods. In Chapter 3, we report a method to effectively immobilize transition metal selectors …
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Measuring Bioavailable Copper in Estuarine Waters using an Ion Exchange Resin
… the percent of weakly bound and strongly bound copper in estuarine waters and agricultural drainage. Copper bound to an ion exchange resin has been operationally defined as bioavailable copper, or copper that is available for uptake by aquatic organisms. Initial laboratory testing indicated that …
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Synthesis of Macrocyclic Polyamines and their Cu, Fe, Mn and Zn Complexes Targeting HIV (AIDS).
… HIV by different mechanisms. The manganese complex of pyridine-fused macrocyclic polyamine (M40401) has been found to reduce HIV-1 induced apoptosis of astroglial cells. Based on these findings, seventeen new compounds were designed and synthesized, including five macrocyclic polyamines …
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X-ray crystallographic studies on the self-condensation products of o-aminobenzaldehyde and anthranilic acid and of the metal complexes of some related tetra-azamacrocycles.
… are put in a wider context. The structure of the copper complex Cu(TAABH2 ) of reduced TAAB derivative TAABH4, a 16-membered tetra-azamacrocycle has been investigated. It, too, has an overall saddle-shape, but this is considerably flatter than those of the TAAB salts and AA derivatives. Two metal …
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Electrocatalysts for the reduction of dioxygen and carbon dioxide
… ORR success of a carbon-supported binuclear copper complex of 3,5-diamino-1,2,4-triazole, the first section of this thesis focuses on four copper complexes built from structurally similar ligands which were synthesized and examined for their effectiveness as ORR electrocatalysts: 1,2,4 …
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Turn-on fluorescent probes for detecting nitric oxide in biology
… protonation state of the secondary amine of the complex is crucial for reactivity. Based on this information, faster-reacting probes can be obtained by lowering the pKa of the secondary amine. The activation parameters for the reaction indicate that the mechanism is associative (ASI = -29 ± 3 …
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A biosynthetic approach to understanding the assembly of CuA centers
… biological processes. Metalloproteins containing copper or iron carry out electron transfer throughout all domains of life. CuA is a unique dinuclear, mixed-valence and valence delocalized copper center, which catalyzes remarkably efficient electron transfer under the low driving forces …