Dissertations / Theses on the topic 'Copper-based complexes'
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Claughton, Hannah J. "Towards radiopharmaceuticals based on copper bis(thiosemicarbazone) complexes." Thesis, University of Oxford, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.442381.
Full textGarrido, Barros Pablo. "Molecular Water Oxidation Catalysts Based on Copper and Nickel Complexes." Doctoral thesis, Universitat Rovira i Virgili, 2018. http://hdl.handle.net/10803/665124.
Full textEsta Tesis Doctoral se centra en el estudio de catalizadores moleculares para la oxidación de agua basados en cobre y níquel, ya que su gran abundancia y su bajo coste los hace potenciales candidatos para su uso en sistemas catalíticos. A pesar de esto, hoy en día hay una importante carencia de información con respecto a sus mecanismos de reacción y los factores que determinan su actividad. Por ello, en primer lugar, se desarrollan nuevos catalizadores moleculares basados en cobre como centro metálico. El estudio mecanístico de dichos catalizadores revela el importante rol que tiene la oxidación del ligando en el ciclo catalítico a la hora de controlar el sobre-potencial de la reacción. Al mismo tiempo, en colaboración con el grupo del Profesor Maseras (ICIQ) se descubre un nuevo mecanismo para la formación del enlace oxígeno-oxígeno que opera en diferentes tipos de catalizadores de cobre. Este nuevo mecanismo sin precedentes permite redefinir el escenario mecanístico para la oxidación de agua. Posteriormente, se realiza el diseño de nuevos ligandos con diferentes propiedades redox que permiten estudiar los factores que influyen en la actividad y el mecanismo de reacción. Esto proporciona información relevante para el diseño de nuevos catalizadores más activos, estables y eficientes. También se aborda la inmovilización de los catalizadores desarrollados sobre electrodos basados en grafeno. De esta forma se descubre el papel esencial que tiene la deslocalización de electrones en orbitales π, que permite incrementar la cinética de reacción por más de dos órdenes de magnitud. Finalmente, el conocimiento generado en cobre se intenta expandir para su aplicación en catalizadores de níquel. Esto permite estudiar el carácter lábil de los complejos de níquel en medios básicos, que determina la presencia de dos mecanismos de operación basados en especies moleculares y óxidos de níquel respectivamente.
This Doctoral Thesis focuses on the study of molecular catalysts for water oxidation based on copper and nickel since their high abundance and inexpensive character make them potential candidates for their use in catalytic systems. Despite that, there is a current lack of information regarding their reaction mechanism and the factors that determine their activity. Therefore, we first develop new molecular catalysts based on copper as metal center. Their mechanistic study reveals the essential role that the ligand oxidation has in the catalytic cycle as tool to control the reaction overpotential. In collaboration with Prof. Maseras group (ICIQ) a new mechanism for the oxygen-oxygen bond formation is found to operate in different copper catalysts. This unprecedented mechanism allows us to redefine the mechanistic scenario in water oxidation. Later on, the design of new ligands with different redox properties is addressed. That allows to study the factors that have influence on the activity and reaction mechanism and provide valuable information for the design of more active, stable and efficient new catalysts. Moreover, the immobilization of the molecular catalyst on the surface of graphene-based electrodes is also studied. We discover the essential role of the π-delocalization in increasing the reaction kinetic by more than two orders of magnitude. Finally, the knowledge developed with copper complexes is applied in nickel catalysis. This allows to study the labile character of nickel complexes in basic media that determine the presence of two different operating mechanism based on molecular species and nickel oxides respectively.
Noack, Cassandra, and n/a. "Studies in Coordination Chemistry." Griffith University. School of Science, 2003. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20031030.145610.
Full textNoack, Cassandra. "Studies in Coordination Chemistry." Thesis, Griffith University, 2003. http://hdl.handle.net/10072/366798.
Full textThesis (PhD Doctorate)
Doctor of Philosophy (PhD)
School of Science
Faculty of Science
Full Text
Stührenberg, Kai [Verfasser]. "Phenanthroline-based copper complexes for water splitting applications : photo-physical and spectroscopic investigations / Kai Stührenberg." Paderborn : Universitätsbibliothek, 2017. http://d-nb.info/1149721782/34.
Full textSudarga, Tjakraatmadja Airlangga Arya Janitra [Verfasser]. "Copper complexes with bpa- and phen-based ligands as artificial nucleases / Airlangga Arya Janitra Sudarga Tjakraatmadja." Berlin : Freie Universität Berlin, 2016. http://d-nb.info/1103486632/34.
Full textMketo, Nomvano. "Palladium and copper complexes based on dendrimeric and monofunctional N, N’ chelating ligands as potential catalysts in the oxidative carbonylation of alcohols." Thesis, Stellenbosch : University of Stellenbosch, 2010. http://hdl.handle.net/10019.1/4288.
Full textENGLISH ABSTRACT: In this thesis we describe the synthesis of several new N-(n-propyl)-1-(2-pyridyl and quinolyl)-imine ligands (ML1-ML4) as well as peripheral functionalised iminopyridyl and iminoquinolyl poly(propylene-imine) dendrimeric ligands (DL1-DL8) with a 1,4- diaminobutane core. The dendrimeric ligands were obtained by modification of the peripheral groups of Generation 1 and Generation 2 poly(propylene-imine) dendrimers, (DAB-(NH2)n which are commercially available, with a series of aldehydes. All the ligands were fully characterised by ESI-mass spectrometry, elemental analysis, 1H&13C{1H}-NMR, FT-IR and UV/Vis spectroscopies. These ligands were utilised to synthesise Pd(II) and Cu(I) complexes using appropriate metal precursors. Some of mononuclear complexes, [N-(n-propyl)-(2-pyridyl and quinolyl) methanimine] dichloro Pd(II) complexes (C1-C4) and bis[N-(n-propyl)-(2-pyridyl and quinolyl) methanimine] copper(I) tetrafluoroborate complexes (C14) were structurally characterised. Pd(II) complexes adopted a distorted square-planar geometry around the metal centre while Cu(I) complex exhibit a distorted tetrahedral arrangement around the metal centre. Both Pd(II) and Cu(I) multinuclear complexes (metallodendrimers) were characterised using a range of analytical techniques.
AFRIKAANSE OPSOMMING: In hierdie tesis word die sintese van verskeie nuwe N-(n-propiel)-1-(2-piridiel) en kinolielimien ligande (ML1-ML4) sowel as gefunksioneerde imienopiridiel en imienokinoliel poli(propilien-imien) dendrimeriese ligande (DL1-DL8) beskryf. Die dendrimeriese ligande was behaal deur die modifikasie van perifere groepe van Generasie 1 en Generasie 2 poli(propilien-imien) dendrimere met ‘n reeks aldehiede. Alle ligande was volledig deur ESI-massaspektrometrie, elementele analiese, 1H en 13C{1H} – KMR, FT-IR en UV/Sigbare spektroskopie gekarakteriseerd. Hierdie ligande was gebruik om Pd(II) en Cu(I) komplekse te berei om van die gepaste metaal voorlopers te gebruik te maak. Sommige van die mono-kern komplekse, [N-(npropiel)-( 2-piridiel) en kinoliel metanimien] dikloor Pd(II), komplekse (C1-C4) en bis[N-(npropiel)-( 2-piridiel) metanimien] koper(I) tetrafloorboraat, kompleks (C14) was struktureël gekarakteriseerd. Pd(II) komplekse neem ‘n versteurde vierkant valk geometrie om die metaal senter aan, terwyl die Cu(I) kompleks, ‘n versteurde tetrahedriese opset rondom die metaal toon. Beide Pd(II) en Cu(I) multikern komplekse (metaaldendrimere) was deur ‘n verskeidenheid van analitiese tegnieke gekarakteriseerd.
Magwa, Nomampondo Penelope. "A spectroscopic study of the electronic effects on copper (II) and copper (I) complexes of ligands derived from various substituted benzyaldehyde- and cinnamaldehyde- based schiff bases." Thesis, Rhodes University, 2010. http://hdl.handle.net/10962/d1006712.
Full textMay, Tricia Lee. "Copper-Based N-Heterocyclic Carbene Complexes for Catalytic Enantioselective Conjugate Additions of Alkyl-, Aryl- and Vinyl-Based Nucleophiles to Form All-Carbon Quaternary Stereogenic Centers." Thesis, Boston College, 2011. http://hdl.handle.net/2345/2650.
Full textChapter 1 Enantioselective Conjugate Additions of Carbon Nucleophiles to Activated Olefins: Preparation of Enantioenriched Compounds Containing All-Carbon Quaternary Stereogenic Centers. Methods for enantioselective conjugate addition of nucleophiles to activated olefins generating products containing all-carbon quaternary stereogenic centers are critically reviewed. Enantioselective conjugate addition has been shown to be a powerful and concise approach to construct carbon-carbon bonds to prepare compounds containing sterically hindered stereogenic centers and has seen great advances in the past several years. Owing to the difficult nature of additions to relatively unreactive conjugate acceptors, compared to additions generating tertiary stereogenic centers, and construction of a sterically-hindered bond, in many cases, new and active catalysts had to be developed. The review discusses the areas where significant advances have been made as well as current limitations and future outlook. Chapter 2 Development of New and Active Catalysts for Cu-Catalyzed Enantioselective Conjugate Addition of Alkyl- and Arylzinc Reagent. Through development of new chiral catalysts, we have found an active and enantiodiscriminating bidentate, sulfonate-containing NHC-Cu catalyst that effects enantioselective conjugate addition of alkyl- and arylzinc reagents on notoriously difficult trisubstituted cyclic enones. Products are prepared with high levels of selectivity and participate in a variety of further functionalizations. The enantioselective additions are efficient and practical, not requiring rigorously anhydrous or oxygen-free conditions. Chapter 3 Cu-Catalyzed Enantioselective Conjugate Addition of Alkyl- and Arylaluminum Reagents to Trisubstituted Enones. Outlined in this chapter is the first effective solution for Cu-catalyzed enantioselective addition of alkyl and aryl nucleophiles to trisubstituted cyclopentenones generating products bearing a β-all-carbon quaternary stereogenic center. Products are obtained in up to 97% yield and 99:1 er, only requiring 5 mol % of an in situ generated Cu-NHC catalyst. The methodology was highlighted as one of the key steps in the total synthesis of clavirolide C. Not only five-membered rings, but six- and seven-membered rings serve as proficient partners in the enantioselective process. Moreover, in cases for the enantioselective aryl addition, in situ prepared Me2AlAr can be used without purification, filtration, or isolation, only requiring the corresponding aryl halides. The additions have also been extended to trisubstituted unsaturated lactones and chromones. Chapter 4 Cu-Catalyzed Enantioselective Conjugate Addition of Vinylaluminum Reagents to Cyclic Trisubstituted Enones. An enantioselective protocol for the formation of β,β-disubstituted cyclic ketones containing a synthetically versatile vinylsilane is disclosed. Enantioselective conjugate addition of in situ prepared silyl-substituted vinylaluminum reagents to β,β-unsaturated ketones promoted by 5 mol % of chiral Cu-NHC complexes delivers desired products with high efficiency (up to 95% yield after purification) and enantioselectivities (up to >98:<2 er). Several functionalizations utilizing the vinylsilanes, vicinal to an all-carbon quaternary stereogenic center, are shown, including an oxidative rearrangement, vinyl iodide formation and protodesilylation, accessing products not previously attainable. Furthermore, the enantioselective protocol is demonstrated as the key transformation in the total synthesis of riccardiphenol B
Thesis (PhD) — Boston College, 2011
Submitted to: Boston College. Graduate School of Arts and Sciences
Discipline: Chemistry
Rösener, Thomas [Verfasser], Sonja [Akademischer Betreuer] Herres-Pawlis, and Andrij [Akademischer Betreuer] Pich. "Advanced ligand design in atom transfer radical polymerisation : on the development of new catalysts based on guanidinoquinoline copper complexes / Thomas Rösener ; Sonja Herres-Pawlis, Andrij Pich." Aachen : Universitätsbibliothek der RWTH Aachen, 2018. http://d-nb.info/1190360896/34.
Full textWright, Gareth. "Fragment based drug discovery for SOD1-ALS and solution X-ray scattering studies on the copper chaperone for SOD1 (hCCS)and its functional complexes with SOD1." Thesis, University of Liverpool, 2011. http://livrepository.liverpool.ac.uk/5473/.
Full textSantoro, Alice. "Métallothionéines et biomolécules capables de chélater et/ou de réduire le Cu et leur impact sur l'activité rédox et sur la stabilité des complexes de Cu d’intérêt médicinal : étude de cas sur des complexes de Cu-peptide amyloïde ou sur des principes actifs à base de Cu." Thesis, Strasbourg, 2019. http://www.theses.fr/2019STRAF067.
Full textDefects in copper (Cu) homeostasis have been linked to Alzheimer’s disease (AD) and Cancer. In AD, Cu has been found to bind to Aβ-peptides in extracellular amyloid-plaques, likely impacting the production of reactive oxygen species (ROS). Increased Cu levels have also been implicated in tumor growth. This has led to the development of Cu-based drugs. Particularly, the use of pro-oxidant Cu-complexes appears to be a promising strategy in cancer. Contrarily, in AD, redox silencing chelators are warranted. In a biological environment, the kinetic/thermodynamic stability of a Cu-complex against physiological competitors, is a key aspect to consider. In particular, the role of Cu-binding and reducing biomolecules (including metallothioneins, gluathione and cystein) is of pivotal importance. Within this context, this thesis aims to investigate the impact of these molecules on the redox-activity and stability of medicinal Cu-complexes. The studies carried out show that these molecules are key players for the fate of a Cu-complex, as they could lead to reactions of dissociation or transmetallation, abolishing the Cu-dependent ROS production
Orth, Nicole [Verfasser], Ivana [Akademischer Betreuer] Ivanovic-Burmazovic, and Ivana [Gutachter] Ivanovic-Burmazovic. "Development of a Novel Inorganic Enzyme Mimetic with Dual Functionality and Characterization of Catalytically Active Copper, Iron and Ruthenium Complexes and Metal Based Self-Assemblies by Cryospray-Ionization Mass Spectrometry / Nicole Orth ; Gutachter: Ivana Ivanovic-Burmazovic ; Betreuer: Ivana Ivanovic-Burmazovic." Erlangen : Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 2021. http://d-nb.info/1237107652/34.
Full textFry, Fiona Helen 1972. "Metal complexes based on macrocyclic ligands and their ability to hydrolyse phosphate esters." Monash University, School of Chemistry, 2002. http://arrow.monash.edu.au/hdl/1959.1/8279.
Full textLuci, Luisa. "Synthesis of heteroleptic Cu(I) complexes based on quinolin-yl-1H-1,2,3-triazole." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/16659/.
Full textUmayal, M. "Biomimetic Studies on Tyrosine- and Phenolate- Based Ligands and their Metal Complexes." Thesis, 2014. http://etd.iisc.ernet.in/handle/2005/2756.
Full textStefańczyk, Olaf. "Magnetic and photomagnetic molecular switches based on copper(II) complexes and octacyanidometallates." Praca doktorska, 2014. https://ruj.uj.edu.pl/xmlui/handle/item/60030.
Full textHung, Chen-Ming, and 洪辰銘. "Metallo-supramolecules Based on Copper and Nickel Complexes with Pyridazine-derivative Ligand." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/04776419615147875195.
Full text淡江大學
化學學系碩士班
97
A series of pyridazine ligands C2-Me-(Clpdz)2 (L1) 、 C2-Me-(Ipdz)2 (L2) 、 C2-Me-(pdz-dmepzo)2 (L3) and their copper ( I ) and nickel ( II ) complexes of the types (Ni2L12) (ClO4)4 , 1 ; (Cu5L33) (ClO4)5 , 2 ; (Cu3L24) (ClO4)3 , 3 ; (NiL1)(ClO4)2 , 4 have been prepared. The complexes were produced by the reactions between ligands and Cu(CH3CN)4 ClO4 or Ni(ClO4)2 • 6H2O . All the complexes have been structurally characterized by X-ray crystallography. Complex 1 exhibits a hair-pin structure. Complexes 2 and 3 exhibits the helical structures . Complex 4 is a salt unit mononuclear Ni cation. The solution states of complexes and their self-assembling processes were examined by Uv-vis titration experiments to elucidate the reaction mechanism.
Yang, Chih-Tung, and 楊之棟. "Chemistry of Copper(I) Complexes Based on Formamidinate Ligands; Synthesis, Structures and Luminescent Properties." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/46my57.
Full text中原大學
化學研究所
106
This thesis discuss the structures and properties of Cu(I) polynuclear complexes and coordination polymers supported by the formamidinate ligands, which is divided into two parts. Part 1: Reactions of N,N’-bis(pyrimidyl-2-yl)formamidine (Hpmf), N,N''-bis(4,6-dimethylpyrimidin-2-yl)formimidamide (Hdmpmf) and N,N''-bis(4-methoxy-6-methylpyrimidin-2-yl)formimidamide (Hmmpmf) with CuX (X = Cl, Br, and I) afforded cyclic complex [Cu4(pmf)4], 1, linear copper chain {[Cu3(dmpmf)3]·CH2Cl2}, 2, cyclic complex [Cu4(mmpmf)4], 3, and compound 4 in which the structure was estimated by luminescence; complexes 1 - 3 were structurally identified by X-ray crystallography. All of the compounds follow the principle of cuprophilicity, where the distance of copper ions effect the luminescence properties. Therefore, one assumption has been proposed to estimate the structure of Cu(I) complexes that contain formamidinate ligands. The emission spectra of 1, 3, and 4 exhibit broad bands in 533 - 545 nm upon the excitation at 370 nm while the linear metal chain 2 exhibits emission at 590 upon the same excitation wavelength. Time-dependent Density function theory (TD-DFT) calculation suggests that the emissions of 1 - 4 are mainly due to metal to ligand 3dσ*/δ*→pπ*charge transfer. Part 2: One-pot hydrothermal reactions of 2-aminopyridine and triethylorthoformate and sodium hydroxide with CuX (X = Br, and I) in dimethylformamide (DMF), tetrahydrofuran (THF), and methanol (MeOH) afforded 1D extended metal atoms chain, {[Cu4(Dpyf)2Br2]・DMF}n, 5, {[Cu4(Dpyf)2Br2]・THF}n, 6, and {[Cu4(Dpyf)2I2]}n, 7, respectively, which were structurally identified by X-ray crystallography. Complexes 5 - 7 present closed-shell Cu(I)---Cu(I) interactions that are supported by formamidinate ligands. Furthermore, reversible crystal-to-crystal transformation were found in complex 5 upon the solvent exchange. The effect of cuprophilicity strongly influence the emission of compounds 5 and 7 where a board emission at 570 nm upon the excitation at 370 nm was observed for 5, while a broad emission at 549 by the excitation wavelength at 370 nm was observed for 7. Density function theory (DFT) implies that the emissions of 5 and 7 are due to metal to ligand 3dσ*/δ*→pπ*charge transfer.
Wang, Chia-Wei, and 王家偉. "Multinuclear Dysprosium and Copper Complexes with Schiff-Based Ligands : Syntheses, Characterizations and Magnetic / Catalytic Applications." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/58725142342694381767.
Full text國立中興大學
化學系所
105
In the research, two kinds of non-schiff-base ligands have been synthesis, N,N''-dimethyl-N,N''-bis(propanone-oxime)-ethylenediamine (ON4O) and 3,3''-(piperazine-1,4,diyl)bis(1-chloropropan-2-ol) (6-Cl), they react with dysprosium metal salts but don’t get any crystal. It inspire to remove wather from surrounding by [Dy2(μ-OH)(bsc)(NO3)2(DMF)3(H2O)] (A), then get complex 1. The unit cell of 1 comprises two similar molecules {[Dy4(bsc)4(DMF)4]、[Dy4(bsc)4(DMF)6]} (1a、1b),and magnetic susceptibility measurements of 1 has higher energy barrier Ueff = 85K than A (78K). The schiff-base ligands react with dysprosium and copper matel salts are generate dinuclear, tetranuclear and octanuclear copper complex[Cu8(hmc)4(DMF)4(NO3)2]・(NO3)2 (2・(NO3)2), [Cu4(hmb)4]・(EtOH)2 (3・(EtOH)2) and [Cu2(hmc)(DMF)2(H2O)]・(NO3) (4・(NO3)), complex 2 has a specific structure which has never been published, complex 3 has a good ctatlytic properties, complex 4 can observed a signal of S = 1 transition by electron paramagnetic resonance spectra (EPR), and complex 2 can also be observed.
Liao, Cheng-Tsung, and 廖政宗. "Synthesis and Characterization of Copper(Ⅱ) Complexes Derived from 1,3,4-Thiadiazole-based Containing Asymmetric Cores." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/09959890797862077314.
Full text國立中央大學
化學研究所
93
The design and synthesis of liquid crystals (LCs) containing heterocyclic units have been the subject of much research in recent years. Series Ⅰ: design and synthesis of Copper(Ⅱ) complexes derived from 1,3,4- thiadiazole-based containing asymmetric cores. Series Ⅱ: a novel system of symmetric dimmer liquid crystals containing benzoxazole units. All compounds were all characterized by 1H and 13C-NMR spectroscopy , their mesomorphic properties were studied by differential scanning calorimeter (DSC) ,polarized optical microscopy (POM) and temperature dependent powder X-ray diffraction. Experimental data indicated that series Ⅰ, all compounds exhibited, nematic(N), smectic A (SmA) and/or smectic C (SmC) phases, as expected by rod-like molecules. In addition, the mesomorphic properties observed by these compounds were found to be strongly dependent on the carbon chain length of terminal side chains. Both the melting and clearing points were increased with decreasing the carbon chain length. The transition temperatures of these rod-like metallo- mesogens are higher than those of the corresponding metal-free ligands. In the series Ⅱ, all compounds exhibited smectic C (SmC) phase, and when we fix the carbon number of the spacer, clearing points increased with increasing the carbon number of side chain. Odd-even effect could also be observed obviously in series Ⅱ.
Prokofieva, Angelina. "Bioinspired oxidation reactions of phenols with dinuclear copper complexes." Doctoral thesis, 2007. http://hdl.handle.net/11858/00-1735-0000-000D-F12D-0.
Full textPramanik, Anup Kumar. "Cytotoxicity of Metal Based Anticancer Active Complexes and their Targeted Delivery using Nanoparticles." Thesis, 2016. http://hdl.handle.net/2005/3154.
Full textLIN, CHUN-YEN, and 林君彥. "Part.I Hydrophobic Copper-based complexes: luminescence, oxygen and glucose-sensing in urinePart.II Four new lead(II)–iridium(III) heterobimetallic coordination frameworks: synthesis, structures, luminescence and oxygen-sensing propertiesPart.III Studies on the sample preparation and characterization of nanoparticles in cosmetic products." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/m8acq8.
Full textClough, Melissa Catherine 1985. "Studies of Platinum Polyynyl Complexes: Elaboration of Novel "Click" Cycloadducts and Fluorous and Polygon Based Platinum Polyyndiyl Systems." Thesis, 2012. http://hdl.handle.net/1969.1/148159.
Full textPinho, Jacinta O. "Cancer chemotherapeutic agents using a nanotechnological approach." Doctoral thesis, 2021. http://hdl.handle.net/10451/50382.
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