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 20 for “"Cyclometalated"”.
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Cyclometalated Platinum β-Diketiminate Complexes
A series of cyclometalated platinum complexes with ancillary β-diketiminate (NacNac) ligands, prepared by a general synthetic route are described. Two different cyclometalating (C^N) ligands―2-phenylpyridine (ppy) and 2-(2,4-difluorophenyl)pyridine (F2ppy)―are used in concert with two different …
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Strategies to Optimize Photophysical Properties in Cyclometalated Iridium Complexes
… ligands. In Chapter 4, the reactivity of bis-cyclometalated iridium bis-isocyanide complexes with azides is explored, which results in luminescent structures that depend on the aryl isocyanide substituents. Chapter 5 introduces a series of red and deep-red emitting heteroleptic …
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Luminescent Iridium(III) Cyclometalated Complexes: Host-Guest Chemistry and Application as Sensors
In this thesis, known and new iridium(III) cyclometalated complexes have been synthesized and investigated in a host-guest chemical context and in studies towards an application in the detection of peroxide-based explosives in fingerprints. The complexes [Ir(ppy-R)2(bpy)]n+ studied here contain two …
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Design and synthesis of cyclometalated transition metal complexes as functional phosphorescent materials
Cyclometalated Ir(III) and Pt(II) compounds are among the most promising phosphorescent emitters for various applications, such as organic light emitting diodes (OLEDs), chemical sensors and bioimaging labels. This family of complexes exhibits high thermal and photo-stability, excellent quantum …
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Synthesis of cyclometalated gold (III) complexesfunctionalized by alkynyl derivatives. Study of the interaction with DNA secondary structures.
This thesis explores the synthesis of cyclometalated gold(III) complexes functionalized by alkynyl ligands, as well as the study of the interaction of the studied complexes with DNA secondary structures. In this work, bidentate and tridentate ligands, in particular derived from both phenylpyridine …
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Synthesis and biological evaluation of polynuclear cyclometalated ruthenium, rhodium and iridium complexes based on a PPI dendritic scaffold
A series of chelating, bidentate (C,N-) monomeric and dendritic ligands based on a poly(propyleneimine) dendritic scaffold were synthesized via a Schiff-base condensation reaction of the relevant amine and either naphthaldehyde or benzaldehyde. These reactions yielded air- and moisture-stable …
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Mechanistic studies on iridium catalyzed allylic substitution
… According to this mechanism the product bound cyclometalated complex is the resting state of the catalyst. First examples of allyliridium complexes containing cyclometalated phosphoramidite ligand were prepared. A series of stoichiometric experiments showed that these allyliridium complexes …
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A Ratiometric Probe for Rapid Evaluation of Transfer Hydrogenation Efficiency
… thesis is to design and synthesize a luminescent cyclometalated Ir(III) complex with ratiometric response to transfer hydrogenation reaction, intended for better understanding and quantifying the Small-Molecule Intracellular Metal Catalysts (SIMCats) efficiency. Chapter 1 gives an introduction to …
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Development of Iridium Based Photosensitizer for Potent Photoreductants and Photocatalytic Application
… Chapter 2 describes the first generation of bis-cyclometalated iridium photoreductants with electron-rich β-diketiminate (NacNac) ligands. The photophysical and electrochemical properties were compared to fac-Ir(ppy)3, known to be a ‘the-state-of-the-art’ photoreductant, and the calculated …
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Sistemas Luminiscentes Ciclometalados de Pt e Ir con Cromóforos 2-Arilbenzotiazol: Aplicaciones Biológicas y Fotocatalíticas
… applications of new luminescent systems based on cyclometalated Pt and Ir complexes with the 2-arylbenzothiazole unit with different coligands. Two series of related cyclometalated Pt(II) complexes and Ir(III) complexes with 2-phenylbenzothiazole (pbt) as chromophore and featuring chelating …
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Sistemas de Pt(II) y Pt(IV) basados en cromóforos 2-arilbenzotiazol: propiedades ópticas y aplicaciones biológicas
… R = Br and Me2N substituents, used to synthesize cyclometalated derivatives. Labile groups (Cl, DMSO), cyanide, C6F5 and bioactive phosphines (having carboxilic o polyether units) have been used as auxiliary ligands to improve emission efficiencies or their solubility in biological media. Diferent …
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Enhancing the Performance of Pt(II)-Based Oxygen Sensing Probes by Expanding the Scope of N,C-Chelate and Ancillary Ligands.
A library of cyclometalated Pt(II) complexes have been established for their uses as luminescent probes for the detection of molecular oxygen. By varying the N,C-chelates of the OSPs (oxygen sensing probes), it was determined that benzothiophene-pyridyl chelates have greater sensitivities compared …
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Mechanistic Investigations Into The Thermal C-C Bond Forming Cyclization Of Metal Pyridine-Enamide Complexes And The Synthesis And Reactivity Of Cationic And Neutral Iron(Iv) Alkylidene Complexes
… results. Iron(II) complexes bearing cyclometalated benzyldialkylphosphine ligands were synthesized via a salt metathesis approach by treating FeCl2(PMe3)2 with two equivalents of (2-lithiobenzyl)diphenyl- and (2-lithiobenzyl)dicyclohexylphosphine reagents. For the phenyl derivative, a …
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Synthesis of heteroaromatic ruthenium dyes for use as electron reservoirs in dye-sensitized solar cells
… fourth chapter describes the synthesis of a cyclometalated diruthenium complex made using 2,3,5,6-tetra-(2-pyridyl)pyridine as a bridging ligand. A strong mixed-valence near-IR absorbance was seen at 1370 nm. </p> <p>The fifth chapter describes the fabrication of dye-sensitized solar cells …
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Pioneering investigations into organometallic electrochemistry
… pincer complexes based on a backbone of a doubly cyclometalated 2,6-bis(4’-tert-butylphenyl) pyridine ligand was performed, in which it was determined that upon reduction of the AuIII complexes, an unsupported AuII dimer is formed, confirmed by characterisation of an authentic sample of the dimer. …
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Iridium (III) photosensitisers for photoredox catalysed carboxylation reactions of ketimines
… Subsequently, two mononuclear cationic bis-cyclometalated iridium(III) complexes (C1, C2) and a new trinuclear iridium(III) complex (C3) were synthesised. The complexes (C1-C3) were obtained as racemic mixtures (Λ, Δ isomers) which is an attribute of the helical chirality, inherent to these …
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EMISSIVE PEPTIDE NUCLEIC ACIDS (PNAS): POTENTIAL TOOLS FOR INNOVATIVE DIAGNOSTICS AND THERAPEUTICS
… dual-action system against cancer Organometallic cyclometalated iridium (III) complexes, containing two phenylpyridine ligands and a phenathroline as third ligand, display excellent photophysical properties, and can act as photosensitizers (PSs) generating cytotoxic singlet oxygen (1O2) for …
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Functionalized Dipyrrins as Ligands for Photoactive Coordination Complexes
… reaction of the functionalized dipyrrins with a cyclometalated chlorido(2-phenylpyridyl)iridium(III) precursor. In the course of these investigations (dipyrrinato)bis(2-phenylpyridyl)iridium(III) complexes with free para-fluorine position were also prepared and reacted with thiocarbohydrates. …