Ruthenium and Osmium Polypyridyl Complexes for Light-emitting and Molecular Electronics Applications PDF Download
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Author: Samuel Flores-Torres
Publisher:
ISBN: 9780542980848
Category :
Languages : en
Pages : 164
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Book Description
We have also prepared and characterized a series of multimetallic oligomers of Ru using the pi-conjugated bridging ligand tetra-2-pyridyl-1,4-pyrazine (tppz), as well as mixed-ligand complexes with terpyridine end-caps, and analyzed their electrochemical and spectroscopic properties, comparing them with modern computational electronic structure methods. The results suggest that the high degree of metal-metal inter-unit communication in these linear oligomers yields low HOMO-LUMO gaps, high delocalization, and the onset of "quasi-band" features, all indicative that these compounds should be excellent molecular wire materials.
Author: Samuel Flores-Torres
Publisher:
ISBN: 9780542980848
Category :
Languages : en
Pages : 164
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Book Description
We have also prepared and characterized a series of multimetallic oligomers of Ru using the pi-conjugated bridging ligand tetra-2-pyridyl-1,4-pyrazine (tppz), as well as mixed-ligand complexes with terpyridine end-caps, and analyzed their electrochemical and spectroscopic properties, comparing them with modern computational electronic structure methods. The results suggest that the high degree of metal-metal inter-unit communication in these linear oligomers yields low HOMO-LUMO gaps, high delocalization, and the onset of "quasi-band" features, all indicative that these compounds should be excellent molecular wire materials.
Author: Samuel Flores-Torres
Publisher:
ISBN:
Category :
Languages : en
Pages : 366
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Author: 伍寶琼
Publisher:
ISBN: 9781374727823
Category :
Languages : en
Pages :
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This dissertation, "Molecular and Polymeric Metal Complexes for Electroluminescence Applications" by 伍寶琼, Po-king, Ng, 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 "MOLECULAR AND POLYMERIC METAL COMPLEXES FOR ELECTROLUMINESCENCE APPLICATIONS" submitted by Ng Po King For the degree of Doctor of Philosophy at the University of Hong Kong in August 1999 Different types of ruthenium or rhenium containing light-emitting conjugated polymers based on derivatives of poly(p-phenylenevinylene), poly(p-phenylene), and poly(phenylene thiophene) have been synthesized. The conjugated mainchain were functionalized with different electron-withdrawing ligands such as dipyridophenazine, oxadiazole, and phenanthroline. Their opto-electronic properties were studied By combining an efficient electron-transporting segment, a hole-transporting segment, and an emissive unit in a single polymer chain with optimized composition, the resulting polymer might possess balanced hole and electron transporting properties and thus enhance the associated electroluminescence efficiency. The metal containing polymerswere synthesized by palladium catalyzed coupling reactions. The properties of the polymers can be adjusted by changing the proportion of different monomers. Apart from the polymeric materials, several trifunctional light-emitting molecules based on rhenium(I) and ruthenium(II) bipyridine complexes were studied. The hole-transporting, electron-transporting, and light-emitting functional groups are incorporated into one single molecule. The complexes were doped in different polymer hosts and their charge transport and luminescent properties were studied. The charge transports of all polymeric and molecular materials are dispersive in nature with non-Gaussian carrier distribution. It was also found that the hole and electron carrier mobilities are similar and of the order of lO DEGREESlO"5 crn DEGREESV''V1, which are both electric field and temperature dependent. The plots of In ju vs. Em show that the charge carrier mobilities decrease with increasing electric field, which suggests the presence of the off-diagonal disorder in the hopping sites. In general, the electron carrier mobilities are slightly higher than those of the hole carrier. This may due to the participation of the electron-withdrawing ligand. Moreover, the electron and hole mobilities of the metal containing polymers are approximately one order of magnitude higher than those of the metal free polymers. This is attributable to the presence of ruthenium complexes which play an important role as charge carrier. The light emitting properties of the polymeric and molecular materials are reported. In some polymers, the emission properties were influenced by the metal complexes and their content. An energy transfer process between the polymer main- chain and the metal center is proposed. Single layer light emitting devices were fabricated and subjected to forward bias. The electroluminescent spectral features resemble those of the photoluminescent spectra, indicating the same type of excitationsand energy bands involved in both photoexcitation and carrier injection by external voltage. Depending on the metal complex content, the polymers exhibit different EL spectra. The devices exhibit low turn-on voltage (5-10 V) and external quantum efficiency of 0.15-0.6 %. By using different metal complex monomers, it is capable of preparing metal-containing polymers with different emission colors and charge transport properties. DOI: 10.5353/th_b2986630 Subjects: Polymeric composites Electrolumi
Author: Xiaohong Chen
Publisher:
ISBN:
Category : Bipyridine
Languages : en
Pages : 516
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Author:
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 924
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Author: Kenneth Kam-Wing Lo
Publisher: Springer
ISBN: 3662467186
Category : Science
Languages : en
Pages : 266
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Book Description
The series Structure and Bonding publishes critical reviews on topics of research concerned with chemical structure and bonding. The scope of the series spans the entire Periodic Table and addresses structure and bonding issues associated with all of the elements. It also focuses attention on new and developing areas of modern structural and theoretical chemistry such as nanostructures, molecular electronics, designed molecular solids, surfaces, metal clusters and supramolecular structures. Physical and spectroscopic techniques used to determine, examine and model structures fall within the purview of Structure and Bonding to the extent that the focus is on the scientific results obtained and not on specialist information concerning the techniques themselves. Issues associated with the development of bonding models and generalizations that illuminate the reactivity pathways and rates of chemical processes are also relevant. The individual volumes in the series are thematic. The goal of each volume is to give the reader, whether at a university or in industry, a comprehensive overview of an area where new insights are emerging that are of interest to a larger scientific audience. Thus each review within the volume critically surveys one aspect of that topic and places it within the context of the volume as a whole. The most significant developments of the last 5 to 10 years should be presented using selected examples to illustrate the principles discussed. A description of the physical basis of the experimental techniques that have been used to provide the primary data may also be appropriate, if it has not been covered in detail elsewhere. The coverage need not be exhaustive in data, but should rather be conceptual, concentrating on the new principles being developed that will allow the reader, who is not a specialist in the area covered, to understand the data presented. Discussion of possible future research directions in the area is welcomed. Review articles for the individual volumes are invited by the volume editors. Readership: research scientists at universities or in industry, graduate students Special offer For all customers who have a standing order to the print version of Structure and Bonding, we offer free access to the electronic volumes of the Series published in the current year via SpringerLink.
Author: Kenneth Kam-Wing Lo
Publisher: Academic Press
ISBN: 012803887X
Category : Science
Languages : en
Pages : 408
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Book Description
Inorganic and Organometallic Transition Metal Complexes with Biological Molecules and Living Cells provides a complete overview of this important research area that is perfect for both newcomers and expert researchers in the field. Through concise chapters written and edited by esteemed experts, this book brings together a comprehensive treatment of the area previously only available through scattered, lengthy review articles in the literature. Advanced topics of research are covered, with particular focus on recent advances in the biological applications of transition metal complexes, including inorganic medicine, enzyme inhibitors, antiparasital agents, and biological imaging reagents. - Geared toward researchers and students who seek an introductory overview of the field, as well as researchers working in advanced areas - Focuses on the interactions of inorganic and organometallic transition metal complexes with biological molecules and live cells - Foscuses on the fundamentals and their potential therapeutic and diagnostic applications - Covers recent biological applications of transition metal complexes, such as anticancer drugs, enzyme inhibitors, bioconjugation agents, chemical biology tools, and bioimaging reagents
Author: Sung-Hoon Kim
Publisher: Elsevier
ISBN: 0080465625
Category : Science
Languages : en
Pages : 283
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Book Description
In the last 10 years organic dyes, traditionally used for coloring textiles and other materials, have become increasingly important in the hi-tech industries of electronics and optoelectronics. They can be used in optical data storage, new solar cells and biomedical sensors.Functional Dyes discusses the synthesis of these new, high-value dyes and pigments as well as their applications and performance. The chapters are arranged so that the reader logically advances from the fundamental concepts to more practical aspects of the technology in which they are used.In providing the reader with current information on functional dye chemistry, as well as important developments within the field, Functional Dyes is a valuable information source for dye and material chemists, researchers and graduates, who want a summary of the key advances in the field over the last 10 years and an authoritative view on future developments.* Provides a broad introduction to the science technology of the functional dye application* Reviews recent advances on synthesis and characteristics of the functional dyes and their applications* Is a valuable information source for dye and material chemists and researchers
Author: Ivan Stibor
Publisher: Springer
ISBN: 9783642445187
Category : Science
Languages : en
Pages : 0
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Book Description
with contributions by numerous experts
Author: Lai Chung Liu
Publisher: Springer Nature
ISBN: 3030548511
Category : Science
Languages : en
Pages : 249
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Book Description
The thesis provides the necessary experimental and analytical tools to unambiguously observe the atomically resolved chemical reactions. A great challenge of modern science has been to directly observe atomic motions during structural transitions, and while this was first achieved through a major advance in electron source brightness, the information content was still limited and new methods for image reconstruction using femtosecond electron diffraction methods were needed. One particular challenge lay in reconciling the innumerable possible nuclear configurations with the observation of chemical reaction mechanisms that reproducibly give the same kind of chemistry for large classes of molecules. The author shows that there is a simple solution that occurs during barrier crossing in which the highly anharmonic potential at that point in nuclear rearrangements couples high- and low-frequency vibrational modes to give highly localized nuclear motions, reducing hundreds of potential degrees of freedom to just a few key modes. Specific examples are given in this thesis, including two photoinduced phase transitions in an organic system, a ring closure reaction, and two direct observations of nuclear reorganization driven by spin transitions. The emerging field of structural dynamics promises to change the way we think about the physics of chemistry and this thesis provides tools to make it happen.
