Download or read book Synthesis of Selected Electron Donors and Acceptors and Study of Inter intramolecular Electron Transfer from Ruthenium II Complexes in Solution Frozen Matrix and Silica Aerogels as the Basis for Optical Devices written by Abdel Monem Mohammad Rawashdeh and published by . This book was released on 2003 with total page 418 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Harvesting energy from the sun is something that nature does well through photosynthesis: green plants convert carbon dioxide to glucose with energy provied by the sun in a complex set of reactions. Mimicking photosynthesis through artificial systems designed to convert optical energy into chemical or electrical energy, has been the goal and challenge for many years ... the photochemical and photophysical properties of transition metal complexes, especially [Ru(bpy)3]2, have been studied comprehensively in terms of the Photoinduced Electron Transfer (PET) properties in donor-acceptor systems (D/A)."--Introduction, p. 1.
Download or read book Inter and Intramolecular Electron Transfer Between Closely Associated Donors and Acceptors written by Mohammad Saied Farahat and published by . This book was released on 1993 with total page 506 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mechanistic Studies on Electron transfer Reactions from Zero valent Ruthenium Complexes to Organic Or Inorganic Acceptors written by Steven John Skoog and published by . This book was released on 1997 with total page 468 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ruthenium II Terpyridyl Complexes Featuring Donor and Acceptor Moieties written by Kevin Barthelmes and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In the last decades, tremendous research has been focused on the conversion of solar energy into chemical energy (i.e., photocatalysis). Hereby, scientists tried to mimic the fundamental processes in natural photosynthesis (i.e., light-harvesting, photoinduced charge separation, charge accumulation and multielectron catalysis), in order to prepare artificial photosynthetic devices. The thesis describes the synthesis and characterization of photoactive assemblies based on ruthenium(II) 2,2':6',2''-terpyridyl complexes that are capable of light-harvesting and photoinduced charge separation. It is shown that the remarkable customizability of terpyridine ligands in 4'-position and readily coordination to ruthenium centers enables a rapid access to highly functionalized complexes. The latter are equipped with organosulfurs as electron donors and fullerenes or polyoxometalates as electron acceptors and the donor-acceptor distance was varied by incorporation of spacer units. The systems can be considered as linear molecular triads with the complex as central light absorbing photosensitizer. Upon visible light excitation, two electron transfer processes involving the donor and acceptor units are observed and result in a long-ranged charge separated state. The lifetime of the charge separation increases with the donor-acceptor distance and is multiple times higher than the lifetime of the excited state, which reflects the effectivity of the photosensitizer. Furthermore, it is demonstrated that light-harvesting antennae systems can be obtained via linkage of iridium(III) and ruthenium(II) complexes. The dinuclear complexes feature enhanced absorptivity and in addition, the light which is absorbed by iridium complex is efficiently transferred to the ruthenium complex.
Download or read book Electron Transfer in Ruthenium Manganese Complexes for Artificial Photosynthesis written by Malin L. A. Abrahamsson and published by . This book was released on 2001 with total page 69 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Transition Metal Donor Peptide Acceptor Complexes written by and published by . This book was released on 2003 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt: The trans-polyproline (PII) oligomers (Figure 1) are unusually rigid peptide structures which have been extensively studied by our group for peptide mediated intramolecular electron transfer (ET) at long distances. We have previously studied ET across a series of metal ion donor (D) acceptor (A) oligoproline peptides with different distances, driving forces and reorganizational energies. The majority of these experiments involve generating the ET intermediate using pulse radiolysis methods, although more recently photochemical methods are also used. Results of these studies showed that ET across peptides can vary by more than twelve orders of magnitude. Using ruthenium bipyridine donors, ET reaction rate constants across several proline residues (n = 4 - 9) occurred in the millisecond (ms) to [mu]s timescale, thus limiting the proline peptide conformational motions to only minor changes (far smaller than the large changes that occur on the ms to sec timescale, such as trans to cis proline isomerization). The present report describes our large data base of experimental results for D-peptide-A complexes in terms of a model where the involvement of both superexchange and hopping (hole and electron) mechanisms account for the long range ET rate constants observed. Our data shows that the change from superexchange to hopping mechanisms occurs at different distances depending on the type of D and A and their interactions with the peptides. Our model is also consistent with generalized models for superexchange and hopping which have been put forward by a number of theoretical groups to account for long range ET phenomena.
Download or read book Directed Self assembly of Inorganic Redox Complexes and the Formation of Charge Separated States written by Benjamin Biber and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Photosynthetic organisms efficiently absorb photons and transfer electrons over long distances, through a series of spatially ordered donor and acceptor molecules that are arranged within a complex architecture to create charge separated states capable of catalysis. However, the design and synthesis of artificial photosynthetic systems with similarly complex arrangements of donors and acceptors remains synthetically challenging. In our lab, inorganic coordination paired with peptide coupling chemistry provides a potential solution for synthesizing complex supramolecular structures that link donors and acceptors via self-assembly. Using a [Ru(bpy)3]2+ chromophore linked to various donors and acceptors via an aminoethylglycine (aeg) backbone, we are able to systematically study the structural features that lead to long lived charge separation in an inorganic supramolecular structure.Tris(bipyridine)ruthenium(II) complexes were functionalized with an aeg backbone functionalized with either a phenothiazine (PTZ) ligand or a phenyl-terpyridine (-tpy) ligand. The PTZ-functionalized aeg backbone covalently binds the [Ru(bpy)3]2+ acceptor to the PTZ donor by forming an amide bond between the [Ru(bpy)32+] and the aminoethylglycine. Addition of Zn2+ causes the linkage of the -tpy-functionalized aeg [Ru(bpy)3]2+ to pyridine-functionalized aeg derivatized with PTZ, creating a donor/acceptor complex via metal coordination. These donor/acceptor complexes provide a facile method to study through space electron transfer and excited state relaxation dynamics, which can include the formation of a charge separated state. We examine these properties by measuring and comparing the emission quantum yields, lifetimes, and rates of electron transfer of these compounds. Our study shows an increase in the nonradiative decay rate when the donor-acceptor pair is linked, either directly or via formation of the Zn coordinative complex, i.e. when the PTZ is attached to [Ru(bpy)3]2+. An increase in the nonradiative decay rate is observed as the distance between the Ru and PTZ donor/acceptor decreases. Both of these observations are consistent with excited state relaxation via an electron transfer from the Ru excited state to the bound PTZ acceptor. To further test our hypothesis, the aeg -tpy-functionalized [Ru(bpy)3]2+ was coordinated to an aeg pyridine-functionalized methyl viologen (MV2+) by addition of Zn2+. As before, the excited state dynamics of the Ru-MV2+ compound were observed: linking the [Ru(bpy)3]2+ compound via Zn coordination to the viologen results in a decrease in the [Ru(bpy)3]2+ excited state lifetime, and increased rates of radiative and nonradiative decay. These rates however are slower in comparison to the rates observed in the Ru-PTZ complexes. The decrease in decay rates may be attributed to conformational flexibility in the Zn coordinated complexes and the electrostatic repulsion between the positively charged Ru and MV2+ in the Ru-MV2+ complex potentially keeping the donor and acceptor at a further distance than in the Ru-PTZ complexes. Based on literature precedence and our observations of the energy levels of excited state [Ru(bpy)3]2+*, PTZ, and MV2+ along with the observed increase in the rates of radiative and nonradiative decay upon formation of either the Ru-PTZ or Ru-MV2+ complexes leads us to conclude that the formation of a charge separated state was achieved. Ongoing investigations aim to directly observe the charge separated state via transient absorption spectroscopy.
Download or read book Supramolecular Photochemistry written by V. Ramamurthy and published by John Wiley & Sons. This book was released on 2011-07-07 with total page 511 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the most updated, comprehensive collection of monographs on all aspects of photochemistry and photophysics related to natural and synthetic, inorganic, organic, and biological supramolecular systems. Supramolecular Photochemistry: Controlling Photochemical Processes addresses reactions in crystals, organized assemblies, monolayers, zeolites, clays, silica, micelles, polymers, dendrimers, organic hosts, supramolecular structures, organic glass, proteins and DNA, and applications of photosystems in confined media. This landmark publication describes the past, present, and future of this growing interdisciplinary area.
Download or read book Upconversion Nanophosphors written by Sabu Thomas and published by Elsevier. This book was released on 2021-11-04 with total page 426 pages. Available in PDF, EPUB and Kindle. Book excerpt: Upconversion Nanophosphors provides detailed information about various lanthanide-based upconversion nanoparticles and their application in different fields. It will also help solve fundamental and applied problems of inorganic phosphor materials showing upconversion behavior, as well as generate innovative ideas related to the application of inorganic phosphor materials. This book will prove to be an invaluable reference work for scientists, engineers, industrial experts, and masters and PhD students working in the field of upconversion and materials science. Covers the synthesis and characterization of upconversion nanophosphors and their applications Highlights which classes of upconversion materials are suitable for a specific application Explores processes to engineer upconversion nanoparticles for state-of-the-art technologies, including upconversion labelling and counterfeiting, highly sensitive and selective biosensing, and upconversion-activated drug delivery
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 Anion Sensing written by Eric V. Anslyn and published by Springer Science & Business Media. This book was released on 2005-05-06 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt: with contributions by numerous experts
Download or read book Materials Chemistry written by Bradley D. Fahlman and published by Springer. This book was released on 2018-08-28 with total page 817 pages. Available in PDF, EPUB and Kindle. Book excerpt: The 3rd edition of this successful textbook continues to build on the strengths that were recognized by a 2008 Textbook Excellence Award from the Text and Academic Authors Association (TAA). Materials Chemistry addresses inorganic-, organic-, and nano-based materials from a structure vs. property treatment, providing a suitable breadth and depth coverage of the rapidly evolving materials field — in a concise format. The 3rd edition offers significant updates throughout, with expanded sections on sustainability, energy storage, metal-organic frameworks, solid electrolytes, solvothermal/microwave syntheses, integrated circuits, and nanotoxicity. Most appropriate for Junior/Senior undergraduate students, as well as first-year graduate students in chemistry, physics, or engineering fields, Materials Chemistry may also serve as a valuable reference to industrial researchers. Each chapter concludes with a section that describes important materials applications, and an updated list of thought-provoking questions.
Download or read book Handbook Of Boron Science With Applications In Organometallics Catalysis Materials And Medicine In 4 Volumes written by Narayan S Hosmane and published by World Scientific. This book was released on 2018-08-07 with total page 1051 pages. Available in PDF, EPUB and Kindle. Book excerpt: Boron science features in numerous fields including organic chemistry, organometallic chemistry and medicine. Boron is unique in all aspects of science and engineering and has made a significant impact in our daily lives through its use in fertilizers, germicides, fungicides, soaps, detergents, cancer drugs as well as many household glassware utensils, ceramics and cell phone windows. These volumes bring together an array of internationally renowned scientists to discuss the very latest developments in the application of boron in a broad range of disciplines. This multi-reference work describes the topic by appointing leading researchers to write on current developments in boron science, showcasing its importance to the four separate areas described in each volume: Organometallic Chemistry, Catalysis, Materials Chemistry and Medicine.Written to cover the full range of applications and innovations in boron science, this all-encompassing work offers us a one-stop reference compiled by world-leading researchers and practitioners of the subject, making it perfect for undergraduate and graduate students of chemistry, and researchers and practitioners interested in their professional development.
Download or read book Micro and Nanomanufacturing Volume II written by Mark J. Jackson and published by Springer. This book was released on 2017-10-28 with total page 566 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a comprehensive treatment of micro and nanofabrication techniques, and applies established and research laboratory manufacturing techniques to a wide variety of materials. It is a companion volume to “Micro and Nanomanufacturing” (2007) and covers new topics such as aligned nanowire growth, molecular dynamics simulation of nanomaterials, atomic force microscopy for microbial cell surfaces, 3D printing of pharmaceuticals, microvascular coaptation methods, and more. The chapters also cover a wide variety of applications in areas such as surgery, auto components, living cell detection, dentistry, nanoparticles in medicine, and aerospace components. This is an ideal text for professionals working in the field, and for graduate students in micro and nanomanufacturing courses.
Download or read book Applications of Ionic Liquids in Polymer Science and Technology written by David Mecerreyes and published by Springer. This book was released on 2015-04-08 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book summarizes the latest knowledge in the science and technology of ionic liquids and polymers in different areas. Ionic liquids (IL) are actively being investigated in polymer science and technology for a number of different applications. In the first part of the book the authors present the particular properties of ionic liquids as speciality solvents. The state-of-the art in the use of ionic liquids in polymer synthesis and modification reactions including polymer recycling is outlined. The second part focuses on the use of ionic liquids as speciality additives such as plasticizers or antistatic agents. The third part examines the use of ionic liquids in the design of functional polymers (usually called polymeric ionic liquids (PIL) or poly(ionic liquids)). Many important applications in diverse scientific and industrial areas rely on these polymers, like polymer electrolytes in electrochemical devices, building blocks in materials science, nanocomposites, gas membranes, innovative anion sensitive materials, smart surfaces, and a countless set range of emerging applications in different fields such as energy, optoelectronics, analytical chemistry, biotechnology, nanomedicine or catalysis.
Download or read book Materials for Biomedical Applications written by Mohammad A. Jafar Mazumder and published by . This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Volume is indexed by Thomson Reuters BCI (WoS).This book summarises the up-to-date status of the field, covers important scientific and technological developments by many distinguished experts, who came together to contribute their research work and comprehensive, in-depth and up to date articles. Written in a versatile and contemporary style, this book can be used as an invaluable reference source for graduate students, scientist, researcher working in chemistry, polymer chemistry, polymer engineering, chemical engineering and materials science. We are thankfully appreciate the tremendous efforts and co-operation of all contributing authors for their devotion, valuable time in preparing state-of-art chapters for this book. We would also like to express our gratitude to the publishers and all authors, and others for granting us the copyright permissions to use their illustrations. Although sincere efforts were made to obtain the copyright permissions from the respective owners to include the citation with the reproduced materials, we would like to offer our sincere apologies to any copyright holder if unknowingly their right is being infringed.
Download or read book Intermediate Temperature Solid Oxide Fuel Cells written by Gurbinder Kaur and published by Elsevier. This book was released on 2019-11-21 with total page 516 pages. Available in PDF, EPUB and Kindle. Book excerpt: Intermediate Temperature Solid Oxide Fuel Cells: Electrolytes, Electrodes and Interconnects introduces the fundamental principles of intermediate solid oxide fuel cells technology. It provides the reader with a broad understanding and practical knowledge of the electrodes, pyrochlore/perovskite/oxide electrolytes and interconnects which form the backbone of the Solid Oxide Fuel Cell (SOFC) unit. Opening with an introduction to the thermodynamics, physiochemical and electrochemical behavior of Solid Oxide Fuel Cells (SOFC), the book also discusses specific materials, including low temperature brownmillerites and aurivillius electrolytes, as well as pyrochlore interconnects. This book analyzes the basic concepts, providing cutting-edge information for both researchers and students. It is a complete reference for Intermediate Solid Oxide Fuel Cells technology that will be a vital resource for those working in materials science, fuel cells and solid state chemistry. Provides a single source of information on glass, electrolytes, interconnects, vanadates, pyrochlores and perovskite SOFC Includes illustrations that provide a clear visual explanation of concepts being discussed Progresses from a discussion of basic concepts that will enable readers to easily comprehend the subject matter
