Download or read book LUMINESCENT PALLADIUM II PL written by Pui-Keong Chow and published by Open Dissertation Press. This book was released on 2017-01-26 with total page 502 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Luminescent Palladium(II) and Platinum(II) Complexes With Tridentate Monoanionic and Tetradentate Dianionic Cyclometallated Ligands: Structures, Photophysical Properties and Material Application" by Pui-keong, Chow, 周沛強, 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: Four structural isomers of platinum(II) complexes with C-deprotonated R-C DEGREESN DEGREESN-R' cyclometallated ligands (R-C DEGREESN DEGREESN-R' = -extended 6-aryl-2,2'-bipyridine derivatives containing 2-naphthyl, 3-isoquinolinyl, 1-isoquinolinyl or 2-quinolinyl moieties) have been synthesized with their photophysical properties investigated. The one bearing a 3-isoquinolinyl moiety shows the highest emission quantum yield among the four and hence has been extensively modified to give a series of complexes with different ancillary ligands (chloride, iodide, phenoxide, or acetylide). Most of these complexes show vibronic emission (max = 515-644 nm) with high emission quantum yield (up to unity) in degassed CH2Cl2; one of them has been used for OLED fabrication and shows a maximum EQE of 8.15 % with current efficiency of 25 cd A-1. The photocatalytic properties of these derivative complexes for oxidative tertiary amine functionalization have also been examined. Several highly robust and emissive platinum(II) complexes supported by two types of tetradentate O DEGREESN DEGREESC DEGREESN ligand systems (Φem up to 0.99; Td up to 520 ℃) have been synthesized and show different emission energies (λmax = 482-561 nm). Most of them exhibit excimeric emission in solution state at room temperature which are dependent on the modifications on the tetradentate O DEGREESN DEGREESC DEGREESN ligands. DFT/TDDFT calculations reveal that the metal complex showing the most intense excimeric emission possesses an excimeric excited state with a localized structure, which is unusual for these classes of platinum(II) complexes. Based on this finding, WOLED (ηL(max) = 71.0 cd/A, ηp(max) = 55.8 lm/W, ηExt = 16.5 %, CIE = 0.33, 0.42, CRI = 77) and WPLED (ηL(max) = 17.0 cd/A, ηp(max) = 9.1 lm/W, ηExt = 9.7 %, CIE = 0.43, 0.45, CRI = 78) based on this complex have been fabricated with high efficiency achieved. Palladium(II) complexes containing C-deprotonated R-C DEGREESN DEGREESN-R' cyclometallated and pentafluorophenylacetylide ligands exhibit phosphorescence in both solid state and fluid solutions at room temperature with some of them exhibiting aggregation-induced emission (AIE). These complexes have been applied as photosensitizers in light-induced oxidative functionalization of secondary and tertiary benzylic amines as well as in light-induced hydrogen production, with a maximum of 175 turnovers for hydrogen produced. Palladium(II) complexes containing two types of tetradentate dianionic O DEGREESN DEGREESC DEGREESN ligand systems (Systems 1 and 2) have been prepared and show constrasting photophyical properties. A full scale time-resolved spectroscopic analysis has been done on some of these complexes and a platinum(II) analogue. These complexes are found to have similar excited state decay pathway( 〖S_1〗 DEGREESi→〖S_1〗 DEGREESf→T) with ΦISC of about unity. The emission efficiency of System 2 complexes is superior to that of System 1 complexes, which is ascribed to the suppression of excited state distortion on the basis of the results of DFT calculations. A lower radiative decay rate of System 2 palladium(II) complexes relative to the platinum(II) analogue has been found, which could be due to their lower spin-orbit coupling constant. One of the palladium(II) complexes ha
Download or read book Luminescent Palladium II and Platinum II Complexes with Tridentate Monoanionic and Tetradentate Dianionic Cyclometallated Ligands written by Pui-keong Chow and published by . This book was released on 2013 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Luminescent Palladium II and Platinum II Complexes with Tridentate Monoanionic and Tetradentate Dianionic Cyclometallated Ligands written by Pui-keong Chow and published by . This book was released on 2013 with total page 480 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Luminescent Platinum ii Palladium ii and Gold iii Complexes Containing Isocyanide Alkynyl and N Heterocyclic Carbene Ligands written by Faan-Fung Hung and published by Open Dissertation Press. This book was released on 2017-01-27 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Luminescent Platinum(II), Palladium(II) and Gold(III) Complexes Containing Isocyanide, Alkynyl and N-heterocyclic Carbene Ligands: Synthesis, Photophysical Properties and Material Applications" by Faan-fung, Hung, 孔繁峰, 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: Several cyclometalated Pt(II) isocyanide complexes containing C-deprotonated C DEGREESN DEGREESC ligands (C DEGREESN DEGREESC = 2,6-diphenylpyridine derivatives) were synthesized. These complexes display orange-red emissions with max at 582-619 nm and quantum yields of up to 26% in CH2Cl2 at room temperature. The incorporation of carbazole/fluorene/thiophene unit(s) to C DEGREESN DEGREESC ligands leads to minimized structural distortion of complexes in their excited states and thereby suppresses non-radiative decay pathways. The high thermal stability (Td >300 C) renders these complexes good candidates as phosphorescent dopants in organic light-emitting diodes (OLEDs). Red-emitting OLEDs with CIE coordinates of (0.650.01, 0.350.01) were fabricated by vacuum deposition, showing a maximum external efficiency of 12%. In addition, well-defined nano/microstructures were obtained from self-assembly of these complexes driven by π∙∙∙π, C-H∙∙∙π and C-H∙∙∙H-C interactions as observed in the crystal structures. Two series of organopalladium(II) alkynyl complexes containing a terpy (terpy = 2,2':6',2''-terpyridine) or C DEGREESN DEGREESC pincer carbene ligand (C DEGREESN DEGREESC = 2,6-bis(1-butylimidazol-2-ylidenyl)pyridine) were prepared. These complexes are non-emissive in solution at room temperature except that the one containing both C DEGREESN DEGREESC and pyrenylacetylide ligands shows phosphorescence (Φ = 0.3%) originating from intraligand state of the acetylide ligand. This could be attributed to the strong -donating N-heterocyclic carbene (NHC) in the pincer ligand that strongly destabilizes d-d state, the population of which provides an efficient non-radiative decay channel. To make comparison between Pd(II) and Pt(II) complexes with the two ligand systems, Pt(II) C DEGREESN DEGREESC alkynyl complexes were also prepared. They are emissive in solution and some display excimer emissions at high concentration (〖10〗 DEGREES(-4)-〖10〗 DEGREES(-3) mol 〖10dm〗 DEGREES(-3)). The X-ray crystal structures of [Pd(L)(CCPh)](〖PF〗_6) (L = terpy and C DEGREESN DEGREESC) revealed one-dimensional chain stacking of complex cations with alternating Pd(II)∙∙∙Pd(II) contacts of about 3.29-3.35 A and π-π interactions of about 3.4 A . Well-defined submicron/nanostructures were obtained from self-assembly of Pd(II) and Pt(II) alkynyl complexes driven by π-π interactions between aromatic moieties and/or metal∙∙∙metal interactions. DFT calculations on the optimized structures of [M(L)(CCPh)]+ (M = Pd(II) and Pt(II)) revealed the existence of metal∙∙∙metal closed-shell interactions. In addition, the complex containing the C DEGREESN DEGREESC ligand exhibits slightly enhanced metal∙∙∙metal interactions and larger "bonding" energy upon dimerization. Furthermore, spin-orbit coupling between singlet and triplet excited states is more effective which promotes rapid intersystem crossing. A new class of cyclometalated Au(III) complexes containing C-deprotonated C DEGREESN ligands (C DEGREESN = 2-phenylpyridine and its derivatives) and cis-chelating bis-NHC ligands was synthesized. These are the first examples of Au(III) complexes supported by cis-chelating bis-NHC ligands. They display emissions in solution under degassed condition at room temperature with &
Download or read book Strongly Luminescent Tetradentate Platinum II and Palladium II Complexes written by 洪偉鴻 and published by . This book was released on 2017 with total page 351 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Luminescent Platinum II Palladium II and Gold III Complexes Containing Isocyanide Alkynyl and N heterocyclic Carbene Ligands written by 孔繁峰 and published by . This book was released on 2014 with total page 580 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis and Luminescence Studies of Branched Carbonrich Platinum ii and Palladium ii Alkynyl Complexes written by Chi-Hang Tao and published by Open Dissertation Press. This book was released on 2017-01-27 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Synthesis and Luminescence Studies of Branched Carbonrich Platinum(II) and Palladium(II) Alkynyl Complexes: Versatile Building Blocks for Multinuclear Assemblies" by Chi-hang, Tao, 陶志恆, 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_b3124601 Subjects: Platinum compounds Palladium compounds Transition metal compounds - Synthesis Photochemistry
Download or read book Synthesis and Luminescence Studies of Branched Carbonrich Platinum II and Palladium II Alkynyl Complexes written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Structural Study of Metallophic Interactions Involving Palladium II and Palladium II gold I Complexes written by Parminder Kaur and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Lminescence and structural studies of a series of Pd(II) homometallic and Pd(II)-Au(I) heterometallic complexes were investigated. Pd(CyNC)2(CN)2 and Au(CyNC)(CN) are two neutral complexes. The interaction between palladium and gold centers results [Pd(CyNC)2(CN)2][Au(CyNC)(CN)]. In [Pd(CyNC)2(CN)2] [Au(CyNC)(CN)], the extended linear chains of alternating cations and anions are formed. Pd(CyNC)2(CN)2 posses homonuclear (Pd-Pd) weak metallic interaction. In [Pd(CyNC)4](PF6)2 , there are no close metal-metal interactions between any of the components. The colorless needles of [Pd(CyNC)2(CN)2][Au(CyNC)(CN)] were grown by diffusion of diethyl ether into methanol solution of the complex. The x-ray crystallography revealed a short palladium-to-gold interaction. Pd(CyNC)2(CN)2 was synthesized as colorless non luminescent needles from diffusion of pentane to a toluene suspension of the complex. The complexes, [Pd(CyNC)2(CN)2][Au(CyNC)(CN)] and Pd(CyNC)2(CN)2, are not luminescent under irradiation of UV light at room temperature. At 77K, under the irradiation of UV light, only [Pd(CyNC)2(CN)2][Au(CyNC)(CN)] crystals show green luminescence. The solids were characterized by IR and UV-Vis spectroscopy and x-ray crystallography. The cation, [Pd(CyNC)4]+ was found to exist as a monomer in solid state. Solvent free salt, [Pd(CyNC)4](PF6)2 was grown from different solvents and was also characterized by single x-ray diffraction.
Download or read book OLED Fundamentals written by Daniel J. Gaspar and published by CRC Press. This book was released on 2015-05-15 with total page 474 pages. Available in PDF, EPUB and Kindle. Book excerpt: A Comprehensive Source for Taking on the Next Stage of OLED R&DOLED Fundamentals: Materials, Devices, and Processing of Organic Light-Emitting Diodes brings together key topics across the field of organic light-emitting diodes (OLEDs), from fundamental chemistry and physics to practical materials science and engineering aspects to design and ma
Download or read book Chiral Luminescence written by Kazuo Akagi and published by John Wiley & Sons. This book was released on 2024-04-09 with total page 1201 pages. Available in PDF, EPUB and Kindle. Book excerpt: Comprehensive resource illustrating the latest stage and development of chiral luminescence in science and technology, from fundamentals to applications Chiral Luminescence imparts a comprehensive understanding for chiral materials bearing circularly polarized luminescence (CPL) functions, including molecules, oligomers, polymers, chiral metal organic complexes, and chiral biochemical materials, with guidance on how to promote and control this kind of luminescence towards the development of advanced photonic materials and devices such as chiroptical and electronic devices, next-generation displays, and others. The book covers detailed information on the molecular design, synthesis, and polymerization methods of chiral luminescent materials, the evaluation of chiroptical properties represented by CPL, novel spectroscopic instruments and techniques, the fabrication of chiral luminescent devices such CPL-OLED, a theoretical evaluation, and potential applications. With insight from leading academics and industrial researchers in the field, Chiral Luminescence includes information on: Optical resolution and chiroptical properties of partially overlapping carbazolophanes and developments in CPL research using cyclodextrins Synthesis and chiroptical properties of helical, conjugated polymers and twisted molecules, and chiroptical and magnetooptical properties of porphyrin compounds Principles of CPL measurement systems and advances in measurement methods, and intense and sign-invertible CPL Development of organic light-emitting diodes using aggregation-induced enhanced CPL perylene diimides Binding constants as fundamental physical properties for quantitative treatments of sensing processes in supramolecular systems Providing far-reaching coverage of chiral luminescence and its many applications, Chiral Luminescence is a must-read resource for a variety of chemists and engineers who wish to understand the state-of-the-art development in this optical science.
Download or read book Proceedings of the Symposium on Chemical Sensors II written by Michael Alan Butler and published by . This book was released on 1993 with total page 884 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Luminescent Cyclometalated Platinum and Palladium Complexes with Novel Photophysical Properties written by Eric Turner and published by . This book was released on 2014 with total page 133 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chapter 5 adapts the ligand structure developed in Chapter 4 to palladium. The resulting complexes exceed reported efficiencies of palladium complexes by an order of magnitude. This chapter also provides the first report of a palladium complex as an emitter in an OLED device. Chapter 6 discusses the continuation of development efforts to include carbazolyl components in the ligand. These complexes possess interesting luminescent properties including ultra-narrow emission and metal assisted delayed fluorescence (MADF) emission.
Download or read book Spatially resolved Luminescence from Graded Cadmium Sulfoselenide Electrodes written by Michael Kevin Carpenter and published by . This book was released on 1984 with total page 518 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Advanced Materials and Techniques for Biosensors and Bioanalytical Applications written by Pranab Goswami and published by CRC Press. This book was released on 2020-11-01 with total page 623 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bioanalytical science and its technological subdomain, biosensors, are ever-evolving subjects, striving for rapid improvement in terms of performance and expanding the target range to meet the vast societal and market demands. The key performance factors for a biosensor that drive the research are selectivity, sensitivity, response time, accuracy, and reproducibility, with additional requirements of its portability and inexpensive nature. These performance factors are largely governed by the materials and techniques being used in these bioanalytical platforms. The selection of materials to meet these requirements is critical, as their interaction or involvement with the biological recognition elements should initiate or improve these performance factors. The technique discussed primarily applies to transducers involved in converting a biochemical signal to optical or electrical signals. Over the years, the emergence of novel materials and techniques has drastically improved the performance of these bioanalytical systems, enabling them to expand their analytical horizon. These advanced materials and techniques are central to modern bioanalytical and biosensor research. Advanced Materials and Techniques for Biosensors and Bioanalytical Applications provides a comprehensive review of the subject, including a knowledge platform for both academics and researchers. Considering biosensors as a central theme to this book, an outline on this subject with background principles has been included, with a scope of extending the utility of the book to coursework in graduate and postgraduate schools. Features: • Basic principles on different classes of biosensors, recent advances and applications • Smart materials for biosensors and other rapid, portable detection devices • Metal nanoparticles and nanocrystals for analytical applications • Carbon-based nanoparticles and quantum dots for sensing applications • Nanozymes as potential catalysts for sensing applications • Bioelectrochemiluminescence and photoelectrochemical-based biosensors • Paper electronics and paper-based biosensors • Microbial biosensors: artificial intelligence, genetic engineering, and synthetic biology • Biofuel cells as a signal transduction platform • FET-based biosensors, including ISFET and BioFET This book serves as a reference for scientific investigators and a textbook for a graduate-level course in biosensors and advanced bioanalytical techniques.
Download or read book Physics and Chemistry of Luminescent Materials including the 4th Symposium on Persistent Phosphors written by U. Happek and published by The Electrochemical Society. This book was released on 2009-03 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt: The papers included in this issue of ECS Transactions were originally presented in the symposium ¿Physics and Chemistry of Luminescent Materials, including the 4th Symposium on Persistent Phosphors¿, held during the PRiME 2008 joint international meeting of The Electrochemical Society and The Electrochemical Society of Japan, with the technical cosponsorship of the Japan Society of Applied Physics, the Korean Electrochemical Society, the Electrochemistry Division of the Royal Australian Chemical Institute, and the Chinese Society of Electrochemistry. This meeting was held in Honolulu, Hawaii, from October 12 to 17, 2008.
Download or read book Reactivity in Confined Spaces written by Gareth Lloyd and published by Royal Society of Chemistry. This book was released on 2021-08-16 with total page 491 pages. Available in PDF, EPUB and Kindle. Book excerpt: The chemistry that occurs within confined spaces is the product of a collection of forces, often beyond the molecule, and is not easily ascribed to singular factors. There is a breadth of material types that can define a confined space (e.g. macrocycles, interlocked molecules, porous and non-porous crystals, organic and inorganic/coordination cages) which are rarely discussed together. Studies of supramolecular entities in the solution and solid states are also not often compared in the same discussion, even though the concepts are often similar or can be easily transferred between the two. Chapters in this book combine classical host-guest chemistry with catalysis, reactivity, and modern supramolecular chemistry. They cover the many different technologies used to describe and understand reactivity in confined spaces in one accessible title. With contributions from leading experts, Reactivity in Confined Spaces will be relevant for graduate students and researchers working in supramolecular chemistry, both organic- and inorganic-based, homogeneous and heterogeneous catalysis, polymer chemistry, and materials science in general.
