Download or read book Synthesis Characterization and Photophysical Property Studies of a Series of Luminescent Organic and Organometallic Compounds written by Min Deng and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fluorescent compounds with special photophysical properties, such as near-infrared (NIR) luminescence and circularly polarized luminescence (CPL), can be applied as bioimaging probes, security inks and chemical sensors. However, due to the inefficient quantum yield or brightness, applications of the developed NIR or CPL emitters in real life have rarely been discussed. In order to overcome these issues, this dissertation describes four chapters regarding the synthesis, characterization and photophysical property studies of a series of new organic and organometallic compounds. In chapter I, a novel mechanism for lanthanide sensitization will be discussed using a pyrene excimer generating ligand. In chapter II, lanthanide-based organometallic complexes with high circularly polarized luminescence brightness enabled by a chiral H8-Binol ligand will be mentioned. In chapter III, circularly polarized luminescence of the first molecular copper-based organometallic complexes incorporating a chiral carbene ligand will be shown. In chapter IV, the synthesis and photophysical property studies of a series of rhodamine derivatives will be included.
Download or read book Molecular Organometallic Materials for Optics written by Hubert Bozec and published by Springer. This book was released on 2009-10-26 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt: S. Di Bella, C. Dragonetti, M. Pizzotti, D. Roberto, F. Tessore, R. Ugo: Coordination and Organometallic Complexes as Second-Order Nonlinear Optical Molecular Materials.- M. G. Humphrey, M.P. Cifuentes, M. Samoc: NLO Molecules and Materials Based on Organometallics: Cubic NLO Properties.- L. Murphy, J. A. G. Williams: Luminescent Platinum Compounds: From Molecules to OLEDs. - Z. Liu, Z. Bian, C. Huang: Luminescent Iridium Complexes and Their Applications.- N. C. Fletcher, M. C. Lagunas: Chromo- and Fluorogenic Organometallic Sensors.- V. Guerchais, H. Le Bozec: Metal Complexes Featuring Photochromic Ligands.
Download or read book Effects of Molecular Interactions on the Photophysical Properties of Luminescent Materials written by Maya Chaaban and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Molecular luminescent materials have been widely studied and used in different applications, including optoelectronics, sensors, and bioimaging. The photophysical properties of these materials are controlled by several factors, such as their aggregation behaviors, molecular electronic structures, and modes of assembly. Molecular interactions, either intra- or intermolecular, play a significant role in regulating these factors. Therefore, understanding these interactions, which are unique to each material system, improves our ability to rationally design molecular luminescent materials with desired electronic and optical properties. In this dissertation, we explore the effects of molecular interactions on the photophysical properties, such as emission colors and photoluminescence quantum efficiencies (PLQEs), for two different classes of materials: cyclometalated Pt(II) complexes and organic metal halide hybrids. Cyclometalated Pt(II) complexes adopt a square-planar geometry that favors their assembly through Pt-Pt interactions. These complexes are known to display very distinguished photophysical properties depending on the level of interactions between the Pt centers. They can either exhibit emissions from the high energy ligand centered/metal-to-ligand charge transfer (LC/MLCT) state or the lower energy metal-to-metal-ligand charge transfer (MMLCT) state. In binuclear Pt(II) complexes, the Pt centers are bridged by an appropriate bridging ligand (e.g., pyrazole) which dictates their molecular geometries. Chapter 2 and 3 of this dissertation discuss binuclear Pt(II) complexes with H-frame and A-frame geometries, respectively. In Chapter 2, the synthesis and characterization of a series of binuclear 2,4-difluorophenylpyridine Pt(II) complexes bridged by thiazol-2-thiolate ligands with different bulkiness are reported. The three complexes adopt H-frame geometries or half-lantern structures with short Pt-Pt distances ranging from 2.916 to 2.945 Å, favoring their intramolecular Pt-Pt interactions. All these complexes are found to exhibit strong and stable 3MMLCT emissions in the orange/red region, with PLQEs reaching near-unity. Chapter 3 covers another series of binuclear Pt(II) complexes that have no intramolecular Pt-Pt interactions due to their A-frame geometries and long Pt-Pt distances. These complexes are bridged by pyrazole and have different cyclometallating ligands (N,N-dimethyl-3-(pyridin-2-yl)aniline and 2-(naphthalen-1-yl)pyridine). The complex with N,N-dimethyl-3-(pyridin-2-yl)aniline as its cyclometallating ligand exhibit a positive solvatochromic behavior introduced by the electron-donating dimethylamino group. This behavior is studied in several solvents with different polarities and evaluated using the Lippert-Mataga correlation and the empirical solvent polarity parameter ET(30). The positive solvatochromism recorded for this complex is assigned to the intramolecular charge transfer character of its emission. In addition to binuclear Pt(II) complexes, mononuclear cationic Pt(II) complexes are studied in Chapter 4. Intermolecular Pt-Pt interactions can exist between these complexes, which are regulated in a series of four mononuclear cationic Pt(II) complexes by modifying their counter-anions and molecular structures. These complexes exhibit strong 3MMLCT emissions in solid state with colors ranging from green to deep red. The structural and photophysical characterizations of these complexes reveal a clear correlation between their stacking modes and photophysical properties. The second class of materials studied in this dissertation is the ionically bonded organic metal halide hybrids. The remarkable structure diversity of this class of materials, originating from the infinite combinations of organic cations and metal halides, unlocks many new properties of both components. In Chapter 5, the synthesis and characterization of a series of benzoquinolinium (BZQ+) metal halides with a unique two-dimensional (2D) structure are reported. The structures are composed of layers of face-sharing metal halides (Pb2X5-, X= Cl, Br) separated and balanced by cationic BZQ+ arrays. The BZQ+ cations are found to be responsible for the emission of these hybrid materials, as revealed by their optical characterizations and theoretical calculations. The inorganic layers in the 2D structure scaffold the organic cations and provide a more rigid architecture due to stronger molecular interactions, enhancing the PLQEs and stability of the BZQ+ cations in the 2D metal halide hybrids compared to the pristine BZQ halides. In addition to the scaffolding effect, the composition of metal halide also affects the photophysical properties of BZQ+ cations. Replacing Cl by the heavy atom Br results in room temperature phosphorescence (RTP) from cationic BZQ+ due to heavy atom effects.
Download or read book Photophysics of Organometallics written by Alistair J. Lees and published by Springer Science & Business Media. This book was released on 2010-02-04 with total page 245 pages. Available in PDF, EPUB and Kindle. Book excerpt: Arvind Kumar, Shih-Sheng Sun, and Alistair J. Lees: Photophysics and Photochemistry of Organometallic Rhenium Diimine Complexes; Conor Long: Photophysics of CO Loss from Simple Metal Carbonyl Complexes; Antonín Vlcek Jr: Ultrafast Excited-State Processes in Re(I) Carbonyl-Diimine Complexes: From Excitation to Photochemistry; Kenneth Kam-Wing Lo: Exploitation of Luminescent Organometallic Rhenium(I) and Iridium(III) Complexes in Biological Studies; Maria L. Muro , Aaron A. Rachford , Xianghuai Wang, and Felix N. Castellano: Platinum II Acetylide Photophysics; Andreas F. Rausch, Herbert H. H. Homeier, and Hartmut Yersin: Organometallic Pt(II) and Ir(III) Triplet Emitters for OLED Applications and the Role of Spin–Orbit Coupling: A Study Based on High-Resolution Optical Spectroscopy.
Download or read book Synthesis Characterization and Photophysical Studies of Organic lanthanide Complexes written by Ka-Leung Wong (Ph. D.) and published by . This book was released on 2006 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Transition Metal and Rare Earth Compounds III written by Hartmut Yersin and published by Springer Science & Business Media. This book was released on 2004-11-18 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt: With contribution by numerous experts
Download or read book Synthesis Characterization and Photophysical Properties of Chalcogenido Phosphinidene and Alkynyl Complexes of Gold I and Its Congener and Their Supramolecular Assembly Arising from Metal Metal Interactions written by Kwok-Ming Lee 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, "Synthesis, Characterization and Photophysical Properties of Chalcogenido, Phosphinidene and Alkynyl Complexes of Gold (I) and Its Congener and Their Supramolecular Assembly Arising From Metal--metal Interactions" by Kwok-ming, Lee, 李國明, 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. DOI: 10.5353/th_b4598342 Subjects: Gold compounds - Synthesis Complex compounds - Synthesis Photochemistry Supramolecular chemistry
Download or read book Synthesis Characterization and Properties of Luminescent Rigid rod Organometallic Acetylide Materials written by Ka Ho Choi and published by . This book was released on 2001 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A New Class of Luminescent Organometallics diethynylrhodacyclopentadienes written by and published by . This book was released on 2010 with total page 263 pages. Available in PDF, EPUB and Kindle. Book excerpt: The main objective in this project is to develop a greater understanding of the unusual photophysical properties of 2,5-bis(arylethynyl)rhodacyclopentadienes. Three distinct and unusual photophysical properties were found in the 2,5-bis(arylethynyl)- rhodacyclopentadienes: (i) long {u2013}lived singlet excited states, from which some of them exhibit high-intensity fluorescence with nanosecond lifetimes; (ii) slow intersystem crossing rates (k values 108 s-1) compared to typical luminescent organometallic complexes ( with k values 1012 s-1); and (iii) no phosphorescence was observed even at 77 k in a rigid glass. Many photophysical experiments such as e.g. low-temperature lifetime measurements, singlet oxygen sensitization and time-resolved infrared (TRIR) have been carried out in order to investigate further and explain the unusual photophysical properties of this class of organometallic complexes. The first example of isomeric biphenyl-rhodacyclopentadiene by-product formation was found in the synthesis of acac-rhodacyclopentadienes. The isomeric biphenylrhodacyclopentadiene by-product with R = CO2ME was isolated and its molecular structure was confirmed by x-ray analysis. Its emission spectrum shows two emission bands with max values of 394 and 544 nm in degassed toluene solution. The fluorescent emission at 394 nm has a quantum yield of 0.03, whereas the phosphorescent emission at 544 nm has a quantum yield of 0.05. The unusual long lifetime (237.6us) of the phosphorescence at room temperature indicates that the transition is from a ligandcentred (LC) * transition. In addition, the synthesis of 1,4-bis(p-R-phenyl) buta-1,3-diynes and novel 1,12-bis(p-R-phenyl)dodaca-1,3,9,11-tetraynes, which serve as the starting materials for the synthesis of the rhodacyclopentadienes, are also reported. Four novel 1,12-bis(p-R-phenyl)dodaca-1,3,9,11-tetraynes (where R = H, SMe, CO2Me and BMes2) have been synthesized and characterised.
Download or read book A New Class of Luminescent Organometallics diethynylrhodacyclopentadienes written by Guan Tay Meng and published by . This book was released on 2010 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The main objective in this project is to develop a greater understanding of the unusual photophysical properties of 2,5-bis(arylethynyl)rhodacyclopentadienes. Three distinct and unusual photophysical properties were found in the 2,5-bis(arylethynyl)- rhodacyclopentadienes: (i) long -lived singlet excited states, from which some of them exhibit high-intensity fluorescence with nanosecond lifetimes; (ii) slow intersystem crossing rates (k values 108 s-1) compared to typical luminescent organometallic complexes (with k values 1012 s-1); and (iii) no phosphorescence was observed even at 77 k in a rigid glass. Many photophysical experiments such as e.g. low-temperature lifetime measurements, singlet oxygen sensitization and time-resolved infrared (TRIR) have been carried out in order to investigate further and explain the unusual photophysical properties of this class of organometallic complexes. The first example of isomeric biphenyl-rhodacyclopentadiene by-product formation was found in the synthesis of acac-rhodacyclopentadienes. The isomeric biphenylrhodacyclopentadiene by-product with R = CO2ME was isolated and its molecular structure was confirmed by x-ray analysis. Its emission spectrum shows two emission bands with max values of 394 and 544 nm in degassed toluene solution. The fluorescent emission at 394 nm has a quantum yield of 0.03, whereas the phosphorescent emission at 544 nm has a quantum yield of 0.05. The unusual long lifetime (237.6us) of the phosphorescence at room temperature indicates that the transition is from a ligandcentred (LC) * transition. In addition, the synthesis of 1,4-bis(p-R-phenyl) buta-1,3-diynes and novel 1,12-bis(p-R-phenyl)dodaca-1,3,9,11-tetraynes, which serve as the starting materials for the synthesis of the rhodacyclopentadienes, are also reported. Four novel 1,12-bis(p-R-phenyl)dodaca-1,3,9,11-tetraynes (where R = H, SMe, CO2Me and BMes2) have been synthesized and characterised.
Download or read book New Polymeric Materials Based on Element Blocks written by Yoshiki Chujo and published by Springer. This book was released on 2019-01-12 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book introduces the recent progress that has resulted from utilizing the idea of "element-block polymers". A structural unit consisting of various groups of elements is called an "element-block." The design and synthesis of new element-blocks, polymerization of these blocks, and development of methods of forming higher-order structures and achieving hierarchical interface control in order to yield the desired functions are expected to result in manifold advantages. These benefits will encourage the creation of new polymeric materials that share, at a high level, electronic, optical, and magnetic properties not achievable with conventional organic polymeric materials as well as forming properties of molding processability and flexible designability that inorganic materials lack. By pioneering innovative synthetic processes that exploit the reactivity of elements and the preparation techniques employed for inorganic element-blocks, the aim is (1) to create a new series of innovative polymers based on the novel concept of element-block polymers, in which the characteristics of elements are extensively combined and utilized, and (2) to formulate theories related to these polymers. This book demonstrates especially the design strategies and the resulting successful examples offering highly functional materials that utilize element-block polymers as a key unit.
Download or read book Proceedings of the First International Workshop on Optical Power Limiting written by Francois Kajzar and published by CRC Press. This book was released on 1999 with total page 572 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Light Emitting Electrochemical Cells written by Rubén D. Costa and published by Springer. This book was released on 2017-07-31 with total page 371 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the recent achievements towards the next generation of Light-emitting electrochemical cells (LEC). Its first part focus on the definition, history and mechanism of LEC, going then to concepts and challenges and, finally, giving the reader examples of current application of new electroluminescent materials. The chapters are written by different international groups working on LEC.
Download or read book Liquid Crystals and Display Technology written by Morteza Sasani Ghamsari and published by BoD – Books on Demand. This book was released on 2020-10-07 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt: Liquid crystals have attracted scientific attention for potential applications in advanced devices. Display technology is continuously growing and expanding and, as such, this book provides an overview of the most recent advances in liquid crystals and displays. Chapters cover such topics as nematic liquid crystals, active matrix organic light-emitting diodes, and tetradentate platinum(II) emitters, among others.
Download or read book Iridium III in Optoelectronic and Photonics Applications written by Eli Zysman-Colman and published by John Wiley & Sons. This book was released on 2017-03-07 with total page 736 pages. Available in PDF, EPUB and Kindle. Book excerpt: The fundamental photophysical properties of iridium(III) materials make this class of materials the pre-eminent transition metal complex for use in optoelectronic applications. Iridium(III) in Optoelectronic and Photonics Applications represents the definitive account of photoactive iridium complexes and their use across a wide variety of applications. This two-volume set begins with an overview of the synthesis of these complexes and discusses their photophysical properties. The text highlights not only mononuclear complexes but also the properties of multinuclear and polymeric iridium-based materials and the assembly of iridium complexes into larger supramolecular architectures such as MOFs and soft materials. Chapters devoted to the use of these iridium-based materials in diverse optoelectronic applications follow, including: electroluminescent devices such as organic light emitting diodes (OLEDs) and light-emitting electrochemical cells (LEECs); electrochemiluminescence (ECL); bioimaging; sensing; light harvesting in the context of solar cell applications; in photoredox catalysis and as components for solar fuels. Although primarily targeting a chemistry audience, the wide applicability of these compounds transcends traditional disciplines, making this text also of use to physicists, materials scientists or biologists who have interests in these areas.
Download or read book Lanthanide Luminescence written by Pekka Hänninen and published by Springer Science & Business Media. This book was released on 2011-06-21 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lanthanides have fascinated scientists for more than two centuries now, and since efficient separation techniques were established roughly 50 years ago, they have increasingly found their way into industrial exploitation and our everyday lives. Numerous applications are based on their unique luminescent properties, which are highlighted in this volume. It presents established knowledge about the photophysical basics, relevant lanthanide probes or materials, and describes instrumentation-related aspects including chemical and physical sensors. The uses of lanthanides in bioanalysis and medicine are outlined, such as assays for in vitro diagnostics and research. All chapters were compiled by renowned scientists with a broad audience in mind, providing both beginners in the field and advanced researchers with comprehensive information on on the given subject.
Download or read book Luminescent and Photoactive Transition Metal Complexes as Biomolecular Probes and Cellular Reagents written by Kenneth Kam-Wing Lo and published by Springer. This book was released on 2015-06-30 with total page 266 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
