Download or read book Syntheses and Luminescence Studies of Di and Polynuclear Gold 1 and Copper 1 Complexes Design Strategies Towards Metalloreceptors and Mixed Metal Complexes written by 張啓亮 and published by . This book was released on 2017-01-28 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Syntheses and Luminescence Studies of Di- and Polynuclear Gold(1) and Copper(1) Complexes, Design Strategies Towards Metalloreceptors and Mixed-metal Complexes" by 張啓亮, Kai-leung, Cheung, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. DOI: 10.5353/th_b3124299 Subjects: Gold - Synthesis Copper compounds - Synthesis Complex compounds - Spectra Photochemistry

Download or read book Syntheses and Luminescence Studies of Di and Polynuclear Gold 1 and Copper 1 Complexes Design Strategies Towards Metalloreceptors and Mixed metal Complexes written by Kai-leung Cheung and published by . This book was released on 2001 with total page 706 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Design Synthesis Characterization and Luminescence Properties of Alkynylgold i Complexes written by Sung-Kong Yip and published by Open Dissertation Press. This book was released on 2017-01-26 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Design, Synthesis, Characterization and Luminescence Properties of Alkynylgold(I) Complexes: Strategies Towards Supramolecular Architectures and Host Guest Chemistry" by Sung-kong, Yip, 葉崇江, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Abstract of thesis entitled DESIGN, SYNTHESIS, CHARACTERIZATION AND LUMINESCENCE PROPERTIES OF ALKYNYLGOLD(I) COMPLEXES STRATEGIES TOWARDS SUPRAMOLECULAR ARCHITECTURES AND HOST GUEST CHEMISTRY Submitted by YIP Sung Kong for the degree of Doctor of Philosophy at The University of Hong Kong in July 2005 A series of luminescent dialkynylaurate(I) complexes, [X][Au(C CR) ] [X = Bu N, R = C H OMe-p, C H OHex-p, C H Oct-p, C H Cl-p, C H CF -p, 1-naphthyl 4 6 4 6 4 6 4 6 4 6 4 3 (Np), 9-anthracenyl (An), 1-pyrenyl (Pyr); X = PPN, R = Pyr] have been synthesized. The X-ray crystal structures of [BuN][Au(CCCHOMe-p)] and 4 64 2 [BuN][Au(CCCHCF-p)] showed the presence of intermolecular hydrogen 4 64 3 2 bonds with bonding distances of ca. 2.599 - 2.620 A. The related pentanuclear gold(I)-copper(I) and -silver(I) mixed-metal alkynyl complexes, [BuN][AuM(CCCH-R-p) ] [M = Cu, R = OMe, OBu, OHex, Et; M = Ag, R = Et, 4 32 64 6 OHex] have been synthesized. The emission origin was tentatively assigned as derived from triplet states of metalloligand-to-metal cluster core charge transfer [Au(C CR) M Au ] (M = Cu, Ag) origin, probably mixed with some metal- 2 2 3 perturbed intraligand *(C C) character. Through the utilization of alkynylcalix[4]crown as ligands, dinuclear gold(I) 1 2 3 alkynylcalix[4]crown-5 complexes, [(R P)Au] L [R = Tol-o, L = L; R = Ph, L = L, L ], 3 2 4 5 6 1 tetranuclear gold(I) alkynylcalix[4]crown assemblies, [Au (L') ] [L' = L, L, L, L ] and 4 2 a mixed-metal gold(I)-copper(I) alkynylcalix[4]crown complex, [Au Cu (L ) ] have 2 2 2 been synthesized. The X-ray crystal structures of all the dinuclear gold(I) complexes, 4 1 4 [Au (L') ] [L' = L, L ] and [Au Cu (L ) ] have been determined. The X-ray crystal 4 2 2 2 2 structures of [Au(L')] showed that two of the gold(I) centers were each 4 2 -coordinated to two alkynyl units, while the other two were each -coordinated by 2 2 the two alkynyl units in an unusual planar, -coordination mode, which was the first of its kind for gold(I) complexes. The Au Au distances between adjacent gold atoms were in the range of 3.1164(11) 3.2118(10) A, indicative of the presence of significant Au Au interactions. The emissive origin of [Au (L') ] was assigned as 4 2 derived from a triplet state of a metal cluster-centered ds/dp character, probably with some mixing of a metal-perturbed intraligand character, while the emission of [Au Cu (L ) ] was assigned to have similar character, but with modification by 2 2 2 Au Cu interactions. The binding properties of the dinuclear gold(I) complexes toward alkali metal ions have been studied. Dinuclear gold(I) complexes, [{Ph PN(R)PPh }Au (C CR') ] [R = Pr, R' = Ph, 2 2 2 2 C H OMe-p, C H Me-p, C H Cl-p; R = C H OMe-p, R' = Ph], have been synthesized 6 4 6 4 6 4 6 4 by deploymerization of alkynylgold polymers using bis(diphenylphosphino)amines as ligands. The X-ray crystal structures of [{PhPN(Pr)PPh}Au(C CPh)] and 2 2 2 2 [{PhPN(Pr)PPh}Au(C CCHOMe-p)]] revealed the presence of short 2 2 2 6 4 2 intramolecular Au Au contacts with the Au Au distances of 2.8404(8) and 3.0708(7) A, respectively. The photophysical properties of the complexes have been studied and their emission orig

Download or read book DESIGN SYNTHESIS OF LUMINESC written by Suk-Hang Lam and published by Open Dissertation Press. This book was released on 2017-01-26 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Design and Synthesis of Luminescent Platinum(II) and Gold(III) Complexes With Tridentate Pincer-type Ligands: From Computational Study to Experiments and Application Studies" by Suk-hang, Lam, 林淑恒, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Abstract of thesis entitled DESIGN AND SYNTHESIS OF LUMINESCENT PLATINUM(II) AND GOLD(III) COMPLEXES WITH TRIDENTATE PINCER-TYPE LIGANDS - FROM COMPUTATIONAL STUDY TO EXPERIMENTS AND APPLICATION STUDIES Submitted by LAM Suk Hang for the degree of Doctor of Philosophy at The University of Hong Kong in June 2015 Square planar platinum(II) and gold(III) complexes possess unique spectroscopic and photophysical properties which enable them as promising candidates for many applications such as optoelectronic devices and biological sensors. The understanding of the intrinsic properties of these complexes is therefore essential to optimize their performance as well as provide guidance on the molecular design for specific applications. This thesis aims to provide useful insights for the molecular design strategies with the aid of computational studies to tune the electronic properties of these complexes and electroluminescence studies in the fabrication of organic light-emitting devices (OLEDs). Computational studies have been performed to inspect electronic structures and photophysical properties as well as their correlation with the nature of ancillary ligands in the platinum(II) complexes of 1,3-bis(N-alkylbenzimidazol-2′-yl)benzene, [Pt(bzimb)(C≡C-R)], 1,3-bis-hetero-azolylbenzenes, [Pt(N DEGREESC DEGREESN)(C≡C-R)], and pyridine-based N-heterocyclic carbene, [Pt(NHC)(C≡C-R)] . It was found that the emission of the arylalkynylplatinum(II) complexes with pyridine-based N-heterocyclic carbene ligand was originated from the triplet alkynyl-to-tridentate pincer ligand-to-ligand charge transfer excited state mixed with platinum-to-tridentate pincer metal-to-ligand charge transfer character, and the excited state energy was found to be red-shifted according to the increasing π electron-donating ability of the aryl group attached to the alkynyl ligand. On the other hand, the emission energies of the platinum(II) complexes of 1,3-bis(N-alkylbenzimidazol-2′-yl)benzene and 1,3-bis-hetero-azolylbenzenes were found to be dependent on the different electron-donating substituents on the pincer ligands. Calculations have also been performed on the representative alkynylplatinum(II) + + complexes [Pt(trpy)(C≡C-R)] (trpy = 2,2′ 6′,2′′-terpyridine), [Pt(bzimpy)(C≡C-R)] (bzimpy = 2,6-bis(N-alkylbenzimidazol-2′-yl)pyridine) and [Pt(bzimb)(C≡C-R)] as well as alkynylgold(III) complexes [Au(C DEGREESN DEGREESC)(C≡C-R)] (C DEGREESN DEGREESC = 2,6-diphenylpyridine), [Au{C(Np) DEGREESN DEGREESC(Np)}(C≡C-R)] (C(Np) DEGREESN DEGREESC(Np) = 2,6-di(2-naphthyl)pyridine) and [Au(N DEGREESN DEGREESN)(C≡C-R)] (N DEGREESN DEGREESN = 2,6-bis(1H-benzimidazol-2-yl)pyridine) in order to have a better understanding on their nature of the emissive origins as well as the radiative and nonradiative processes. In particular, factors governing the ordering of the triplet excited states and radiative decay rate constants of the emissive state ( ES) have been examined. Their potential energy profiles for the deactivation process from the ES via triplet metal-centered states have also been explored. This study revealed for the first time the potential energy profiles for the thermal deactivation pathway of square planar platinum(II) and gold(III) complexes. In addition to the computational

Download or read book Synthesis and Luminescence Studies of Homo And Heteronuclear Complexes of Gold and Copper written by Chui-Ling Chan and published by Open Dissertation Press. This book was released on 2017-01-26 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Synthesis and Luminescence Studies of Homo- and Heteronuclear Complexes of Gold and Copper" by 陳翠玲, Chui-ling, Chan, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. DOI: 10.5353/th_b3123817 Subjects: Gold compounds - Cannot find the sub-field 'S' for code '650' Copper compounds - Synthesis Luminescence

Download or read book Synthesis and Original Reactivity of Copper and Gold Complexes written by Maximilian Joost and published by Springer. This book was released on 2015-06-13 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis addresses the coordination chemistry and reactivity of copper and gold complexes with a focus on the elucidation of (i) the metal-mediated activation of σ-bonds and (ii) the migratory insertion reaction. Both processes are of considerable importance in organometallic chemistry, but remain elusive for Cu and Au complexes. In this work, the author contributes significant advances: The first σ-SiH complexes of copper are experimentally and computationally characterized, yielding valuable insights into σ-bond activation processes for copper. Evidence for a highly unusual migratory syn insertion of unsaturated organic molecules into the gold-silicon bond of silylgold (I) complexes is provided and the corresponding mechanism identified. The intermolecular oxidative addition of σ-SiSi, σ-CC and σ-CX (X=halogen) bonds with molecular gold (I) complexes is studied in detail, effectively demonstrating that this reaction, usually considered to be impossible for gold, is actually highly favored, provided an adequate ligand is employed. The use of small-bite angle bis (phosphine) gold (I) complexes allows for the first time the oxidative addition of σ-CC and σ-CX bonds for gold (I). These results shed light on an unexpected reactivity pattern of gold complexes and may point the way to 2-electron redox transformations mediated by this metal, opening up new perspectives in gold catalysis.

Download or read book SYNTHESES PHOTOPHYSICS PHOTO written by 李維傑 and published by Open Dissertation Press. This book was released on 2017-01-27 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Syntheses, Photophysics and Photochemistry of Polynuclear D10 Complexes of Copper(I) and Gold(I)" by 李維傑, Wai-kit, Lee, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. DOI: 10.5353/th_b3123426 Subjects: Copper compounds - Synthesis Gold compounds - Synthesis Photochemistry

Download or read book SYNTHESIS STRUCTURE PHOTOPHY written by Dan Li and published by Open Dissertation Press. This book was released on 2017-01-27 with total page 266 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Synthesis, Structure and Photophysical and Photochemical Properties of Polynuclear Copper (1), Silver (1) and Gold (1) Complexes" by 李丹, Dan, Li, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. DOI: 10.5353/th_b3123312 Subjects: Copper Silver Gold Photochemistry

Download or read book Syntheses and Photophysics of Luminescent Polynuclear Coinage Metal Complexes with Chalcogen and Pnictogen written by 鄭重展 and published by . This book was released on 2017-01-27 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Syntheses and Photophysics of Luminescent Polynuclear Coinage Metal Complexes With Chalcogen and Pnictogen: Containing Bridging Ligands" by 鄭重展, Chung-chin, Cheng, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. DOI: 10.5353/th_b3124153 Subjects: Silver compounds - Synthesis Copper compounds - Synthesis Gold compounds - Synthesis Ligands Photochemistry

Download or read book Anion Receptor Chemistry written by Jonathan L Sessler and published by Royal Society of Chemistry. This book was released on 2007-10-31 with total page 431 pages. Available in PDF, EPUB and Kindle. Book excerpt: Anion recognition plays a critical role in a range of biological processes, and a variety of receptors and carriers can be found throughout the natural world. Chemists working in the area of supramolecular chemistry have created a range of anion receptors, drawing inspiration from nature as well as their own inventive processes. This book traces the origins of anion recognition chemistry as a unique sub-field in supramolecular chemistry while illustrating the basic approaches currently being used to effect receptor design. The combination of biological overview and summary of current synthetic approaches provides a coverage that is both comprehensive and comprehensible. First, the authors detail the key design motifs that have been used to generate synthetic receptors and which are likely to provide the basis for further developments. They also highlight briefly some of the features that are present in naturally occurring anion recognition and transport systems and summarise the applications of anion recognition chemistry. Providing as it does a detailed review for practitioners in the field and a concise introduction to the topic for newcomers, Anion Receptor Chemistry reflects the current state of the art. Fully referenced and illustrated in colour, it is a welcome addition to the literature.

Download or read book Design Synthesis and Characterization of Luminescent Dinuclear and Polynuclear Complexes of Gold I and Platinum II with Alkynylcalix 4 arene and Bridging Sulfido Ligands written by 侯嘉華 and published by . This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Design Synthesis and Characterization of Metal Complexes of D and D Electronic Configuration and Their Inorganic Organic Hybrids written by Chi-Ming Frankie Leung and published by . This book was released on 2017-01-26 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Design, Synthesis and Characterization of Metal Complexes of D⁶ and D⁰ Electronic Configuration and Their Inorganic-organic Hybrids: From Covalent Conjugation to Supramolecular Assembly and Luninescence Chemosensing" by Chi-ming, Frankie, Leung, 梁志明, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Abstract of thesis entitled DESIGN, SYNTHESIS AND CHARACTERIZATION OF METAL COMPLEXES 6 10 OF d AND d ELECTRONIC CONFIGURATION AND THEIR INORGANIC-ORGANIC HYBRIDS - FROM COVALENT CONJUGATION TO SUPRAMOLECULAR ASSEMBLY AND LUMINESCENCE CHEMOSENSING Submitted by LEUNG CHI MING, FRANKIE for the Degree of Doctor of Philosophy at The University of Hong Kong in January 2015 6 10 Various classes of transition metal complexes with d and d electronic configuration and their inorganic-organic hybrids have been prepared and employed for molecular recognition studies. A series of crown ether-based bis-alkynyl-bridged gold(I) complexes have been designed, synthesized and characterized. The alkali metal cation-binding properties of the complexes have been studied by UV-vis, emission, H NMR and ESI-mass spectroscopy. The binding of K has switched "on" or "off" the emission associated with intramolecular aurophilic interaction of the complexes upon formation of the ion-bound adducts in a sandwich fashion. Various spacers between the two crown ether units were found to affect the binding affinities. In addition, a tetranuclear alkynylgold(I) complex with four amide groups has been successfully synthesized and characterized. The photoluminescence of the complex has been switched on upon the binding of cadmium ion due to the suppression of photo-induced electron transfer (PET) and rigidification of the molecule. The binding mode has been studied by 2D NOESY H NMR experiments. By combining the advantages of supramolecular chemistry and nanotechnology, the conjugation of transition metal complexes to gold nanoparticles (GNPs) has been studied. A number of lipoic acid-containing ruthenium(II) and rhenium(I) bipyridine complexes have been synthesized and characterized. Covalent functionalization of GNPs with these complexes has resulted in interesting supramolecular assemblies with Forster resonance energy transfer (FRET) properties that could be modulated via esterase hydrolysis. The enzymatic activity has been determined by Michaelis-Menten kinetics. The quenching mechanism has also been studied by transient absorption and time-resolved emission decay measurements. Besides, a number of adamantane-containing Ru(II) and Re(I) complexes have been synthesized and characterized. These complexes were non-covalently functionalized with the β-cyclodextrin capped gold nanoparticles (β-CD-GNPs) through the host-guest interaction between cyclodextrin and adamantine, which were characterized by using 2D ROESY H NMR experiments. The FRET properties of the conjugates could be modulated via both esterase hydrolysis and competitive displacement of steroid. The FRET efficiencies were found to vary with the nature of the chromophores and the length of the spacer between the transition metal complexes and the GNPs. In addition, the conjugation of transition metal complexes to various anisotropic nano-materials has also been studied. A bis-adamantane-containing Re(I) complex has been synthesized and characterized. The complex was found to induce the "end-to-end" assembly of cyclodextrin-end-modified gold nanorods (β-CD-GNRs) of different aspect ratios, which have been characterized by transmiss

Download or read book Synthesis and Luminescence Studies of Homo and Heteronuclear Complexes of Gold and Copper written by Chui-ling Chan and published by . This book was released on 1998 with total page 622 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book DESIGN SYNTHESIS FUNCTIONALI written by Yau-Hin Hong and published by Open Dissertation Press. This book was released on 2017-01-26 with total page 332 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Design, Synthesis and Functionalization of Luminescent Alkynylgold(I) Complexes With [pi]-conjugated Ligands: From Photophysics to Supramolecular Assembly" by Yau-hin, Hong, 康祐軒, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Abstract of the thesis entitled DESIGN, SYNTHESIS AND FUNCTIONALIZATION OF LUMINESCENT ALKYNYLGOLD(I) COMPLEXES WITH π-CONJUGATED LIGANDS  FROM PHOTOPHYSICS TO SUPRAMOLECULAR ASSEMBLY Submitted by HONG Yau Hin for the Degree of Doctor of Philosophy at The University of Hong Kong in July 2015 A library of polynuclear thiophene-based alkynylgold(I) complexes with N-heterocyclic carbenes (NHCs) and triphenylphosphine as the peripheral ligands, [R{(C≡C)Au(NHC)} ] (R = benzo[1,2-b:4,5-b']dithiophene, n = 2, 4; benzo[1,2- b:3,4-b':5,6-b'']trithiophene, n = 3; dithieno[3,2-b:2',3'-d]thiophene, n = 2; dithieno[3,2-e:2',3'-g](dibenzo[b, d]-thiophene), n = 2; 4-hexyl-4H-dithieno[3,2- b:2',3'-d]pyrrole, n = 4) and [R'{(C≡C)Au(PPh )}] (R' = benzo[1,2-b:4,5- 3 2 b']dithiophene), has been synthesized and characterized. The X-ray crystal structure of [BDT{(C≡C)Au(IHex)} -2,6] (BDT = benzo[1,2-b:4,5-b']dithiophene, IHex = 1,3-dihexylimidazol-2-ylidene) has been determined by X-ray crystallography. This class of complexes showed dual emissive behaviour and exhibited broad vibronic-structured emission bands in degassed dichloromethane solution at ambient temperature. As demonstrated by the temperature-dependent UV-vis absorption spectroscopy, some of the alkynylgold(I) complexes were shown to self-assemble in THFwater mixtures through a cooperative growth mechanism. Variation of the alkyl chain length on the NHC ligands not only has a significant effect on the morphologies of the aggregates, but also on the thermodynamic parameters of the self-assembly processes as revealed by the nucleationelongation model. Apart from the thiophene-based sulfur heterocycle-containing alkynylgold(I) system, a series of N-alkyl substituted triindole-based nitrogen heterocycle-containing trinuclear alkynylgold(I) complexes with isocyanide and NHCs as the peripheral ligands, [(TATI){(C≡C)Au(C≡N-R)}] (TATI = trialkyltriindole; R = 2,6-dimethoxyphenyl, 2,6-dimethylphenyl), and [(TATI){(C≡C)Au(NHC)}], has been prepared and characterized. The photophysical properties of the trinuclear alkynylgold(I) complexes have been examined. Their self-assembly properties have also been explored using TEM, SEM, DLS, H NMR spectroscopy, solvent-dependent and variable-temperature UV-vis absorption experiments. Some of the complexes have been demonstrated to possess spherical nanostructures in their THFwater dispersions. The self-assembly was believed to be mediated by the ππ stacking interactions of the central triindole moiety and governed by a cooperative growth mechanism. In addition, a novel class of amphiphilic phosphole-based phosphorus heterocycle-containing alkynylgold(I) complexes, [Au(C≡C-R){Ph-DBP(O)-  ] O(CH ) SO }]K (DBP = 5H-dibenzophosphole; R = phenyl, naphthyl, 2 3 3 phenanthrenyl, pyrenyl, perylenyl, 4-methoxyphenyl, 4-chlorophenyl) was designed and synthesized. The photophysical properties of this class of complexes have been studied. Some of the complexes were shown to display sheet-like nanostructures in aqueous DMSO solution. The self-assembly process was found to be governed by an isodesmic mechanism and mediated by hydrophobichydrophobic interactions between the alkynyl units. It has been shown that modulation of t

Download or read book Synthesis and Characterization of Luminescent Gold III Complexes written by Amanda N. Sulicz and published by . This book was released on 2017 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt: The chemistry of cyclometalated gold(III) has been relatively slow to emerge, but recent advances in catalyst and material design have driven a renewed interest. Reported here are synthetic, structural, and optical studies of cyclometalated gold(III) aryl complexes. These new complexes show ligand-centered luminescence that is perturbed by the heavy-atom effect of gold. Traditionally, metal-carbon bond formation relied on organometallic complexes of electropositive elements, including lithium and magnesium. The easily reducible nature of gold(III) often interferes with these conventional reagents, thus resulting in the use of toxic metals like mercury or thallium. Reported here is the use of palladium-catalyzed Suzuki-Miyaura cross-coupling for the attachment of aryl ligands to cyclometalated gold(III) chloride complexes. The resulting di- and mono-arylated species were luminescent. Several complexes have been crystallographically characterized. Luminescent derivatives of a previously published gold(III) chloro precursor, initially reported for catalytic purposes, were prepared through boron transmetalation reactions. Complexes bearing both aryl and cyanide ligands were synthesized. These luminescent materials are diamagnetic and were be characterized by multinuclear NMR, absorption and emission spectroscopies (including time-resolved emission), and by X-ray diffraction crystallography. The synthesized gold(I) complexes were designed to display reverse saturable absorption and be a two photon acceptor. The BTF (BTF = 2-(9,9’-diethyl-9H-fluoren-2-yl)-benzothiazole) ligand was chosen as it has been previously demonstrated to have favorable photophysical effects on platinum(II) and ruthenium(II) complexes for applications in photodynamic therapy and optical power limiting (OPL). Gold(I) complexes with the BTF ligand are sought for potential OPL applications. Synthesized complexes are luminescent and were characterized by multinuclear NMR, absorption and emission spectroscopies, photoluminescent quantum yields, time-resolved emission. Two complexes were crystallographically characterized.

Download or read book Syntheses Luminescence Studies and Host Guest Chemistry of D10 and D6 Metal Complexes Containing Diimine And or Chalcogenolate Ligand written by Yung-Lin Pui and published by . This book was released on 2017-01-28 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Syntheses, luminescence studies and host-guest chemistry of d10 and d6 metal complexes containing diimine and/or chalcogenolate ligand" by 裴雍蓮, Yung-lin, Pui, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. DOI: 10.5353/th_b4389436 Subjects: Transition metal complexes Electron donor-acceptor complexes Ligands Photochemistry

Download or read book Design Synthesis Characterization and Luminescence Properties of Alkynylgold I Complexes written by Sung-kong Yip and published by . This book was released on 2005 with total page 662 pages. Available in PDF, EPUB and Kindle. Book excerpt: