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Computational Characterization Of Photoabsorption And Structure Of Porphyrin Fullerene Dyads
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Book Synopsis Computational Characterization of Photoabsorption and Structure of Porphyrin-fullerene Dyads by : Oana Cramariuc
Download or read book Computational Characterization of Photoabsorption and Structure of Porphyrin-fullerene Dyads written by Oana Cramariuc and published by . This book was released on 2006 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Synthesis and Characterization of Novel Porphyrin-Fullerene-Dyads and Cyclomalonate-linked Trisfullerene by : Maximilian Popp
Download or read book Synthesis and Characterization of Novel Porphyrin-Fullerene-Dyads and Cyclomalonate-linked Trisfullerene written by Maximilian Popp and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Computational Study of Photoinduced Energy Transfer of Porphyrin-fullerene and Oligo(p-phenylenevinylene)-fullerene Dyads by : Teemu Toivonen
Download or read book Computational Study of Photoinduced Energy Transfer of Porphyrin-fullerene and Oligo(p-phenylenevinylene)-fullerene Dyads written by Teemu Toivonen and published by . This book was released on 2007 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Photophysical Characterization of a Series of Self-assembled Donor-acceptor Dyads Containing Porphyrin and N-confused Porphyrin Electron Donors and Studies of the Tautomerization of N-confused Porphyrins by : Jojo Joseph (Chemist)
Download or read book Photophysical Characterization of a Series of Self-assembled Donor-acceptor Dyads Containing Porphyrin and N-confused Porphyrin Electron Donors and Studies of the Tautomerization of N-confused Porphyrins written by Jojo Joseph (Chemist) and published by . This book was released on 2013 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt: Interactions such as pi-pi stacking in organic pi-systems, proton coupling, and hydrogen bonding can be utilized to prepare nanostructures with excellent mechanical and electronic properties. In particular, self-assembled donor-acceptor complexes have received much recent attention because of their potential applications in optoelectronics such as photovoltaic cells and organic light emitting diodes. Porphyrins and their derivatives have been extensively used as building blocks for nanomaterials because of their optical, electronic, catalytic and biochemical properties. The pi-pi stacking and metal coordination ability of porphyrins make them very suitable for the formation of self-assembled structures. The first part of this work involves the photophysical characterization of self-assembled donor-acceptor complexes, where porphyrin derivatives are used as electron donors together with electron acceptors such as naphthalene diimide, perylene diimide, or fullerenes. In the second part, the tautomerization of N-confused tetraphenylporphyrin in various solvents was probed using time-resolved fluorescence spectroscopy.The first part of the work described here is the photophysical characterization of a self-assembled chiral bolaamphiphiles comprised of central tetraphenylporphyrin (H2TPP) with naphthalenediimide (NDI)-lysine moieties flanked on both ends. The strong intermolecular pi-pi interactions between the H2TPP and NDI chromophores leads to the formation of monolayer rings which further stack to form self-assembled nanorods. The effect of local nanostructure of assemblies on the photophysical properties was probed using steady-state fluorescence, time-resolved fluorescence and femtosecond transient absorption spectroscopic studies. This work demonstrates the importance of controlling local nanostructure in modulating the photophysical properties of optoelectronic materials. The second project involves the photophysical characterization of self-assembled donor-acceptor complexes containing an H2TPP and NDI-lysine amphiphile. Strong intermolecular pi-pi interactions between the TPP and NDI chromophores, together with the proton transfer from the lysine head group to the porphyrin ring leads to self-assembly in chloroform. Photoinduced electron transfer in the nanorods was probed using steady state fluorescence, time-resolved fluorescence and femtosecond transient absorption spectroscopic studies. The third portion of this dissertation involves the photophysical characterization of donor-acceptor systems containing covalently bound porphyrin-fullerene dyads, where different numbers (1-4) of C60-fullerenes were attached to a porphyrin core to enhance electron transfer efficiency. In this work, the fluorescence quantum yield measurements, time-resolved fluorescence and femtosecond transient absorption spectroscopic studies were used to study electron-transfer from the porphyrin core to the fullerene group(s). The fourth project involved studies of the equilibrium of the two tautomers of N-confused tetraphenylporphyrins (NCTPP). The steady-state absorption and fluorescence spectra of NCTPP have been found to significantly depend on the nature of the solvent. The previously reported photophysical studies indicated that both NCTPP tautomers can coexist in certain solvents, presumably in equilibrium with one another, while other solvents exclusively prefer one tautomer or the other. In order to gain a better understanding of the NCTPP tautomerization, NCTPP was studied by time-resolved fluorescence spectroscopy in a series of solvents having different solvent parameters. Also examined in this work was the origin of a moderately strong excited state solvent isotope effect in both steady-state and dynamic measurements. In the final project, the spectroscopic properties of a novel self-assembled ZnNCTPP-PDI traid were examined. Donor-acceptor dyads using H2TPP have been examined for years, but studies of D-A dyads based on NCTPP have not been significantly explored. In this project a non-covalently linked D-A complex formed from a zinc N-confused tetraphenylporphyrin dimer [(ZnNCTPP)2] and a pyridyl substituted perylenediimide (Py-PDI-Py) were examined. The coordination of pyridyl group on the PDI with zinc results in the dissociation of the (ZnNCTPP)2 dimer and results in the formation of a ZnNCTPP-Py-PDI-Py-ZnNCTPP triad. Steady-state and time-resolved fluorescence measurements were performed to probe the formation of the triad as well as photoinduced electron transfer in this traid.
Book Synopsis Photochemistry and Photophysical Characterization of Porphyrin & N-confused Porphyrin Dyads by : Elvin A. Alemán
Download or read book Photochemistry and Photophysical Characterization of Porphyrin & N-confused Porphyrin Dyads written by Elvin A. Alemán and published by . This book was released on 2006 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt: In order to understand and mimic the processes that occur in photosynthesis, the photophysical properties of a series of porphyrinic molecules have been investigated. This work is divided into five projects involving the study of three different porphyrins and porphyrinoids: 1) free base N-confused tetraphenylporphyrin and various substituted derivatives, 2) free base N-confused porphyrin-zinc porphyrin, N-confused porphyrinpyromellitimide and N-confused porphyrin-pyrene arrays, 3) free base tetraphenylcorroles, 4) a series of porphyrin-quinone arrays to probe porphyrin excited state structure and 5) a series of porphyrin-naphthalenediimide arrays to explore energy and electron transfer as a function of linker/bridge dendron type. N-Confused tetraphenylporphyrin (NCTPP) differs from tetraphenylporphyrin (H2TPP) by having one of the pyrrolic nitrogens inverted and facing outside the macrocycle, with a C-H group inside. The inverted pyrrole ring in NCTPP results in a change in the [pi]-system of the macrocycle, leading to photophysical properties that are different than those of H2TPP. The first project was intended to investigate the photophysical properties of the two NCTPP tautomers, as well as several substituted (di- and tetra-) NCTPP derivatives using several spectroscopic techniques, including steady-state absorption and emission spectroscopy, time-correlated single photon counting, femtosecond transient absorption and nanosecond transient absorption spectroscopy. The second project consisted of the studies the photophysical characterization of pentameric N-confused porphyrin-zinc tetraphenylporphyrin artificial light-harvesting array (NCP-ZnP4), the photophysical properties of an N-confused-pyromellitimide array (NCP-Pym4), and the photophysical characterization of an N-confused porphyrin-pyrene donor-acceptor dyad (NCP-Pyr). The supramolecular systems NCP-ZnP4, NCP-Pym4 and NCP-Pyr represent the first structures where an N-confused porphyrin has been covalently incorporated into an array designed to involve highly efficient photoinduced energy and electron transfer processes. Free base corroles differ from free base porphyrin by having one of meso methine carbons replaced by a direct pyrrole-pyrrole linkage. The fourth project in this dissertation involved the photophysical characterization of four free base triphenylcorroles using steady state absorption and emission spectroscopy, and time correlated single photon counting experiments. The photophysical results indicate that similar to NCTPP, there is noticeable solvent dependence on the corrole photophysical properties. It is postulated that these differences result from the presence of two (or more) different tautomers. Although regular tetraphenylporphyrins such as H2TPP and Zntetraphenylporphyrin (ZnTPP) have been extensively used in different artificial photosynthetic systems, their incorporation into arrays presents characterization challenges, and energy and electron transfer mechanisms differ from array to array. The fifth project presented here involved an investigation into the effects of donor-acceptor orientation on the electron transfer (ET) and charge recombination (CR) rate constants. In a series of porphyrin-benzoquinone (PBQ) dyads, methyl groups on the meso phenyl groups were used to control the orientation between the donor and acceptor groups. The rate constants for ET and CR in these compounds are discussed, as well as the ramifications of these results on porphyrin photophysics. The final project in this dissertation involved the study of the photophysical properties of a series of triads, where two ZnTPP electron donor groups were linked, using a flexible dendritic spacer, to a naphthalenediimide acceptor group. The flexibility in these triads permitted the formation of several conformers, which were investigated using steady state and time-resolved spectroscopic techniques as well as semi-empirical molecular orbital calculations.
Book Synopsis Computational Methods in Science and Engineering by : George Maroulis
Download or read book Computational Methods in Science and Engineering written by George Maroulis and published by AIP Conference Proceedings / M. This book was released on 2009-09-02 with total page 974 pages. Available in PDF, EPUB and Kindle. Book excerpt: The aim of ICCMSE 2008 is to bring together computational scientists and engineers from several disciplines in order to share methods, methodologies and ideas. The potential readers are all the scientists with interest in: Computational Mathematics, Theoretical Physics, Computational Physics, Theoretical Chemistry, Computational Chemistry, Mathematical Chemistry, Computational Engineering, Computational Mechanics, Computational Biology and Medicine, Scientific Computation, High Performance Computing, Parallel and Distributed Computing, Visualization, Problem Solving Environments, Software Tools, Advanced Numerical Algorithms, Modelling and Simulation of Complex Systems, Web-based Simulation and Computing, Grid-based Simulation and Computing, Computational Grids, and Computer Science.
Book Synopsis Comprehensive Nanoscience and Technology by :
Download or read book Comprehensive Nanoscience and Technology written by and published by Academic Press. This book was released on 2010-10-29 with total page 2785 pages. Available in PDF, EPUB and Kindle. Book excerpt: From the Introduction: Nanotechnology and its underpinning sciences are progressing with unprecedented rapidity. With technical advances in a variety of nanoscale fabrication and manipulation technologies, the whole topical area is maturing into a vibrant field that is generating new scientific research and a burgeoning range of commercial applications, with an annual market already at the trillion dollar threshold. The means of fabricating and controlling matter on the nanoscale afford striking and unprecedented opportunities to exploit a variety of exotic phenomena such as quantum, nanophotonic and nanoelectromechanical effects. Moreover, researchers are elucidating new perspectives on the electronic and optical properties of matter because of the way that nanoscale materials bridge the disparate theories describing molecules and bulk matter. Surface phenomena also gain a greatly increased significance; even the well-known link between chemical reactivity and surface-to-volume ratio becomes a major determinant of physical properties, when it operates over nanoscale dimensions. Against this background, this comprehensive work is designed to address the need for a dynamic, authoritative and readily accessible source of information, capturing the full breadth of the subject. Its six volumes, covering a broad spectrum of disciplines including material sciences, chemistry, physics and life sciences, have been written and edited by an outstanding team of international experts. Addressing an extensive, cross-disciplinary audience, each chapter aims to cover key developments in a scholarly, readable and critical style, providing an indispensible first point of entry to the literature for scientists and technologists from interdisciplinary fields. The work focuses on the major classes of nanomaterials in terms of their synthesis, structure and applications, reviewing nanomaterials and their respective technologies in well-structured and comprehensive articles with extensive cross-references. It has been a constant surprise and delight to have found, amongst the rapidly escalating number who work in nanoscience and technology, so many highly esteemed authors willing to contribute. Sharing our anticipation of a major addition to the literature, they have also captured the excitement of the field itself in each carefully crafted chapter. Along with our painstaking and meticulous volume editors, full credit for the success of this enterprise must go to these individuals, together with our thanks for (largely) adhering to the given deadlines. Lastly, we record our sincere thanks and appreciation for the skills and professionalism of the numerous Elsevier staff who have been involved in this project, notably Fiona Geraghty, Megan Palmer and Greg Harris, and especially Donna De Weerd-Wilson who has steered it through from its inception. We have greatly enjoyed working with them all, as we have with each other.
Book Synopsis Handbook of Photochemistry by : Marco Montalti
Download or read book Handbook of Photochemistry written by Marco Montalti and published by CRC Press. This book was released on 2006-02-21 with total page 662 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since the publication of the second edition of this handbook in 1993, the field of photochemical sciences has continued to expand across several disciplines including organic, inorganic, physical, analytical, and biological chemistries, and, most recently, nanosciences. Emphasizing the important role light-induced processes play in all of these fie
Book Synopsis Recent Advances in Density Functional Methods by : Delano Pun Chong
Download or read book Recent Advances in Density Functional Methods written by Delano Pun Chong and published by World Scientific. This book was released on 1995 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt: Of all the different areas in computational chemistry, density functional theory (DFT) enjoys the most rapid development. Even at the level of the local density approximation (LDA), which is computationally less demanding, DFT can usually provide better answers than Hartree-Fock formalism for large systems such as clusters and solids. For atoms and molecules, the results from DFT often rival those obtained by ab initio quantum chemistry, partly because larger basis sets can be used. Such encouraging results have in turn stimulated workers to further investigate the formal theory as well as the computational methodology of DFT.This Part II expands on the methodology and applications of DFT. Some of the chapters report on the latest developments (since the publication of Part I in 1995), while others extend the applications to wider range of molecules and their environments. Together, this and other recent review volumes on DFT show that DFT provides an efficient and accurate alternative to traditional quantum chemical methods. Such demonstration should hopefully stimulate frutiful developments in formal theory, better exchange-correlation functionals, and linear scaling methodology.
Book Synopsis The Porphyrin Handbook by : Karl Kadish
Download or read book The Porphyrin Handbook written by Karl Kadish and published by Elsevier. This book was released on 2000 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Porphyrin Handbook, Volume 19: Applications of Phthalocyanines provides information pertinent to every aspect of the chemistry, synthesis, spectroscopy, and structure of phthalocyanines. This book examines the biology and medical implications of porphyrin systems. Organized into five chapters, this volume begins with an overview of the basic photobiology of phthalocyanines, their structure-activity relationships, mechanisms of action in a variety of biological systems, and their potential applications for various medical purposes. This text then examines the type of organization of the molecules in the solid state and the intensity of the intermolecular interactions. Other chapters consider the applications of phthalocyanines as decorative and functional materials, with emphasis on properties and structures of phthalocyanines with industrial relevance. This book discusses as well the enzyme-like catalytic functions of metal complexes derivatives and their practical applications as odor-removing systems and bacterial systems based on their effective catalytic activities. This book is a valuable resource for research scientists, engineers, and clinicians.
Download or read book Gold Chemistry written by Fabian Mohr and published by John Wiley & Sons. This book was released on 2009-04-20 with total page 425 pages. Available in PDF, EPUB and Kindle. Book excerpt: Written by world-class authors, this most recent major book on the topic highlights new and current trends as well as future directions. It is comprehensive in its scope, covering all aspects of gold chemistry -- from homogeneous to heterogeneous catalysis, from supramolecular assemblies to sensors and medicinal applications. The result is an invaluable work for both organic and inorganic chemists working in universities and industry, as well as material scientists.
Book Synopsis Dendrimers and Dendrons by : George Richard Newkome
Download or read book Dendrimers and Dendrons written by George Richard Newkome and published by Wiley-VCH Verlag GmbH. This book was released on 2001 with total page 648 pages. Available in PDF, EPUB and Kindle. Book excerpt: What's new in dendrimer research? Just as these fascinating giant molecules are continuing to ramify, new perspectives and challenges continue to emerge. This bestseller on dendritic molecules discusses the latest developments in the synthesis and application of these macromolecules. It gives a comprehensive, up-to-date account of the topic, from the historical overview and theoretical background up to the most recent achievements. Having shaped this scientific field, the authors are able to brilliantly combine the basic principles with a wealth of more advanced information. The optimal presentation of the structural features of dendrimers helps readers to quickly understand even sophisticated syntheses. For special synthetic problems, the well-selected, detailed list of references allows easy access to further literature. This monograph will undoubtedly prove to be of interest for both beginners and advanced scientists in organic and pharmaceutical chemistry, as well as material science.
Book Synopsis Nanoscience with Liquid Crystals by : Quan Li
Download or read book Nanoscience with Liquid Crystals written by Quan Li and published by Springer Science & Business. This book was released on 2014-04-17 with total page 431 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book focuses on the exciting topic of nanoscience with liquid crystals: from self-organized nanostructures to applications. The elegant self-organized liquid crystalline nanostructures, the synergetic characteristics of liquid crystals and nanoparticles, liquid crystalline nanomaterials, synthesis of nanomaterials using liquid crystals as templates, nanoconfinement and nanoparticles of liquid crystals are covered and discussed, and the prospect of fabricating functional materials is highlighted. Contributions, collecting the scattered literature of the field from leading and active players, are compiled to make the book a reference book. Readers will find the book useful and of benefit both as summaries for works in this field and as tutorials and explanations of concepts for those just entering the field. Additionally, the book helps to stimulate future developments.
Book Synopsis Molecular Materials by : Duncan W. Bruce
Download or read book Molecular Materials written by Duncan W. Bruce and published by John Wiley & Sons. This book was released on 2011-04-04 with total page 455 pages. Available in PDF, EPUB and Kindle. Book excerpt: “... the book does an excellent job of putting together several different classes of materials. Many common points emerge, and the book may facilitate the development of hybrids in which the qualities of the “parents” are enhanced.” –Angew. Chem. Int. Ed. 2011 With applications in optoelectronics and photonics, quantum information processing, nanotechnology and data storage, molecular materials enrich our daily lives in countless ways. These materials have properties that depend on their exact structure, the degree of order in the way the molecules are aligned and their crystalline nature. Small, delicate changes in molecular structure can totally alter the properties of the material in bulk. There has been increasing emphasis on functional metal complexes that demonstrate a wide range of physical phenomena. Molecular Materials represents the diversity of the area, encapsulating magnetic, optical and electrical properties, with chapters on: Metal-Based Quadratic Nonlinear Optical Materials Physical Properties of Metallomesogens Molecular Magnetic Materials Molecular Inorganic Conductors and Superconductors Molecular Nanomagnets Structured to include a clear introduction, a discussion of the basic concepts and up-to-date coverage of key aspects, each chapter provides a detailed review which conveys the excitement of work in that field. Additional volumes in the Inorganic Materials Series: Low-Dimensional Solids | Molecular Materials | Porous Materials | Energy Materials
Book Synopsis Handbook Of Carbon Nanomaterials (Volumes 9-10) by : R Bruce Weisman
Download or read book Handbook Of Carbon Nanomaterials (Volumes 9-10) written by R Bruce Weisman and published by World Scientific. This book was released on 2019-01-22 with total page 812 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume is a tribute to the career of Prof. Mildred Dresselhaus. It focuses on the optical properties and spectroscopy of single-wall carbon nanotubes. It contains chapters on diverse experimental and theoretical aspects of the field, written by internationally recognized experts. The volume serves as an important resource for researchers and students interested in carbon nanotubes.
Book Synopsis Modern Molecular Photochemistry by : Nicholas J. Turro
Download or read book Modern Molecular Photochemistry written by Nicholas J. Turro and published by University Science Books. This book was released on 1991 with total page 644 pages. Available in PDF, EPUB and Kindle. Book excerpt: During the last two decades the photochemistry of organic molecules has grown into an important and pervasive branch of organic chemistry. In Modern Molecular Photochemistry, the author brings students up to date with the advances in this field - the development of the theory of photoreactions, the utilization of photoreactions in synthetic sequences, and the advancement of powerful laser techniques to study the mechanisms of photoreactions.
Book Synopsis Nonlinear Optical Materials by : Jerome V. Moloney
Download or read book Nonlinear Optical Materials written by Jerome V. Moloney and published by Springer Science & Business Media. This book was released on 1998-08-13 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mathematical methods play a significant role in the rapidly growing field of nonlinear optical materials. This volume discusses a number of successful or promising contributions. The overall theme of this volume is twofold: (1) the challenges faced in computing and optimizing nonlinear optical material properties; and (2) the exploitation of these properties in important areas of application. These include the design of optical amplifiers and lasers, as well as novel optical switches. Research topics in this volume include how to exploit the magnetooptic effect, how to work with the nonlinear optical response of materials, how to predict laser-induced breakdown in efficient optical devices, and how to handle electron cloud distortion in femtosecond processes.
