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Dynamics Of Ultrafast Processes In Excited States Of Organic And Inorganic Compounds
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Book Synopsis Dynamics of Ultrafast Processes in Excited States of Organic and Inorganic Compounds by : Julien Eng
Download or read book Dynamics of Ultrafast Processes in Excited States of Organic and Inorganic Compounds written by Julien Eng and published by . This book was released on 2015 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis can be divided in two parts.In the first one, we have studied the photoisomerization process in several systems. An electronic structure analysis mixed with a preliminary semi-classical dynamics investigation has been applied to a minimal model of the retinal chromophore in order to select the most important degrees of freedom involved in the process. The goal of this is to build diabatic potential energy surfaces in order to conduct quantum dynamics simulations. A semi-classical approach has also been applied to a molecular motor model to study the origin of the unidirectionality of its rotary motion. Finally, an electronic structure of a rhenium complex with a retinal-like ligand has been performed to study the effect of the coordination to a metallic atom on the spectroscopy of the retinal ligand. In the second part, we have investigated the intersystem crossings in a rhenium complex. In order to bring an explanation to an experimentally observed conterintuitive behavior of this complex, we have developed a model Hamiltonian that includes both interstate vibronic coupling and spin-orbit coupling. This Hamiltonian has been tested on the said complex and, in complement to an electronic structure study, allowed us to formulate a decay mechanism different from the one proposed based on experiments.
Book Synopsis Exploration of the Excited States of Organic Molecules and Metal Complexes Using Ultrafast Laser Spectroscopy by : Nicole Marie Dickson
Download or read book Exploration of the Excited States of Organic Molecules and Metal Complexes Using Ultrafast Laser Spectroscopy written by Nicole Marie Dickson and published by . This book was released on 2011 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: The excited states of organic molecules and inorganic complexes were examined using ultrafast time resolved spectroscopies. Femtosecond transient absorption was used to unveil the early-time dynamics of organic molecules and inorganic complexes. Picosecond time correlated single photon counting was used to observe emission lifetimes. Nanosecond transient absorption spectroscopy was used to observe the molecules and complexes on the nanosecond to microsecond time scale. The nature of the lowest excited symmetry state was studied in 1,4-diphenyl-1,3-butadiene and 1,1,4,4-tetraphenyl-1,3-butadiene and was determined to have mixed character that was highly dependent on solvent. The inorganic complexes studied here have application as photodynamic therapy (PDT) agents. [Ru(bpy)2(BN)2]2 complexes, where BN is methylbenzonitrile or methoxybenzonitrile, undergo ligand exchange in water. Upon photoaquation, the complexes may bind to DNA and cause cell death. The process of ligand exchange was studied on the femtosecond time scale. It was found that ligand exchange occurs in concert with intersystem crossing to the triplet state within the time duration of the laser pulse (300 fs). Finally, the PDT agents [Ru(bpy)2(dppn)]2 and [Os(bpy)2(dppn)]2 were studied to unveil the effects of the low-lying LC 3[pai][pai]* state on the excited-state decay processes. From the initial excited state in [Ru(bpy)2(dppn)]2+ and [Os(bpy)2(dppn)]2+ deactivation to the 3 [pai][pai]* state and the 3 MLCT state occurs within 300 fs.
Book Synopsis Ultrafast Excited State Dynamics of Inorganic Molecules Related to Modern Light Harvesting Applications by : Firew Tarekegn Gemeda
Download or read book Ultrafast Excited State Dynamics of Inorganic Molecules Related to Modern Light Harvesting Applications written by Firew Tarekegn Gemeda and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Halide complexes of heavy metals attract great attention due to their applications in photonics and light harvesting (collection of solar energy through photochemical processes with subsequent conversion into chemical energy). Ultrafast spectroscopic studies deliver the molecular level understanding of very initial physicochemical processes, which often define the useful functions these complexes provide, and can be used for rationally designing the materials in which these complexes are the building blocks. We aim to investigate ultrafast excited-state reaction dynamics and photophysical/photochemical relaxation mechanisms of hexahalide complexes of heavy metals. In the first part of this work, the excited-state relaxation pathways in a Bi(III) hexahalide, BiX63-, (X = I, Br) a paradigm complex for understanding the ns2 main group metals, are studied by means of femtosecond transient absorption spectroscopy supported by nanosecond transient absorption spectroscopy, steady-state absorption/emission measurements and DFT computations. Radiationless relaxation out of the initially excited, predominantly metal-centered (MC) triply degenerate 3T1u state, populates two lower-energy states: a ligand-to-metal-charge transfer (LMCT) excited state of the 3Ï0 LMCT I(npÏ0)2̐ʼBi(6p) nature and a luminescent 'trap' 3A1u(3P0) MC state. On a nanosecond timescale, the 3Ï0 LMCT population decays through other intermediates to generate the triplet species (acetonitrile solvent), which is identified as the Îʺ2 metal ligated dihalide-bismuth adduct with the intramolecularly formed X-X bond, [(Îʺ2-X2)Bi(II)X4]38́2, the product of interest for applications in solar energy conversion and storage. In the second part of this work, the ultrafast dynamics of IrCl62-, a prototype low-spin d5 metal complex, excited into intraconfigurational short-wavelength-infrared MC and visible LMCT electronic states is studied by femtosecond transient absorption spectroscopy. Upon any excitation of the complex in water or acetonitrile solutions, the excited-state molecules are found to relax into the ground electronic state via a cascade-like relaxation mechanism. Excited-state Jahn-Teller effect is a driving force for the relaxation dynamics even in this case where substantial spin-orbit interactions in the molecular system are present. Femtosecond pulsed state-selective excitation undertaken in this project is shown to be essential for unravelling the complex excited-state relaxation mechanism of the heavy metal complexes, providing new understanding of their structure and function.
Book Synopsis Adventures in Chemical Physics by : R. Stephen Berry
Download or read book Adventures in Chemical Physics written by R. Stephen Berry and published by John Wiley & Sons. This book was released on 2005-11-28 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt: Adventures in Chemical Physics continues to report recent advances with significant, up-to-date chapters by internationally recognized researchers from a variety of prestigious academic and professional institutions such as McGill University, the University of Pennsylvania, the Lawrence Berkeley National Laboratory, Tel Aviv University, and the University of Chicago.
Book Synopsis Organic Optoelectronic Materials by : Yongfang Li
Download or read book Organic Optoelectronic Materials written by Yongfang Li and published by Springer. This book was released on 2015-05-30 with total page 402 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume reviews the latest trends in organic optoelectronic materials. Each comprehensive chapter allows graduate students and newcomers to the field to grasp the basics, whilst also ensuring that they have the most up-to-date overview of the latest research. Topics include: organic conductors and semiconductors; conducting polymers and conjugated polymer semiconductors, as well as their applications in organic field-effect-transistors; organic light-emitting diodes; and organic photovoltaics and transparent conducting electrodes. The molecular structures, synthesis methods, physicochemical and optoelectronic properties of the organic optoelectronic materials are also introduced and described in detail. The authors also elucidate the structures and working mechanisms of organic optoelectronic devices and outline fundamental scientific problems and future research directions. This volume is invaluable to all those interested in organic optoelectronic materials.
Book Synopsis Photoinduced Molecular Dynamics in Solution by : Gianluca Levi
Download or read book Photoinduced Molecular Dynamics in Solution written by Gianluca Levi and published by Springer Nature. This book was released on 2019-09-03 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book explores novel computational strategies for simulating excess energy dissipation alongside transient structural changes in photoexcited molecules, and accompanying solvent rearrangements. It also demonstrates in detail the synergy between theoretical modelling and ultrafast experiments in unravelling various aspects of the reaction dynamics of solvated photocatalytic metal complexes. Transition metal complexes play an important role as photocatalysts in solar energy conversion, and the rational design of metal-based photocatalytic systems with improved efficiency hinges on the fundamental understanding of the mechanisms behind light-induced chemical reactions in solution. Theory and atomistic modelling hold the key to uncovering these ultrafast processes. Linking atomistic simulations and modern X-ray scattering experiments with femtosecond time resolution, the book highlights previously unexplored dynamical changes in molecules, and discusses the development of theoretical and computational frameworks capable of interpreting the underlying ultrafast phenomena.
Book Synopsis Highly Efficient OLEDs by : Hartmut Yersin
Download or read book Highly Efficient OLEDs written by Hartmut Yersin and published by John Wiley & Sons. This book was released on 2019-01-04 with total page 604 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dieses Fachbuch eines Pioniers in diesem schnell wachsenden Fachbereich fasst die jüngsten Erkenntnisse zur Optimierung von OLEDs zusammen. Die Theorie wird ausführlich beschrieben, ebenso verschiedene organische und anorganische emittierende Materialien, Display- und Lichtanwendungen.
Book Synopsis Quantum Chemistry and Dynamics of Excited States by : Leticia González
Download or read book Quantum Chemistry and Dynamics of Excited States written by Leticia González and published by John Wiley & Sons. This book was released on 2020-11-10 with total page 688 pages. Available in PDF, EPUB and Kindle. Book excerpt: An introduction to the rapidly evolving methodology of electronic excited states For academic researchers, postdocs, graduate and undergraduate students, Quantum Chemistry and Dynamics of Excited States: Methods and Applications reports the most updated and accurate theoretical techniques to treat electronic excited states. From methods to deal with stationary calculations through time-dependent simulations of molecular systems, this book serves as a guide for beginners in the field and knowledge seekers alike. Taking into account the most recent theory developments and representative applications, it also covers the often-overlooked gap between theoretical and computational chemistry. An excellent reference for both researchers and students, Excited States provides essential knowledge on quantum chemistry, an in-depth overview of the latest developments, and theoretical techniques around the properties and nonadiabatic dynamics of chemical systems. Readers will learn: ● Essential theoretical techniques to describe the properties and dynamics of chemical systems ● Electronic Structure methods for stationary calculations ● Methods for electronic excited states from both a quantum chemical and time-dependent point of view ● A breakdown of the most recent developments in the past 30 years For those searching for a better understanding of excited states as they relate to chemistry, biochemistry, industrial chemistry, and beyond, Quantum Chemistry and Dynamics of Excited States provides a solid education in the necessary foundations and important theories of excited states in photochemistry and ultrafast phenomena.
Book Synopsis Spectroscopic Properties of Inorganic and Organometallic Compounds by : Jack Yarwood
Download or read book Spectroscopic Properties of Inorganic and Organometallic Compounds written by Jack Yarwood and published by Royal Society of Chemistry. This book was released on 2010-06 with total page 334 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reflecting the growing volume of published work in this field, researchers will find this book an invaluable source of information on current methods and applications.
Book Synopsis PHOTOPHYSICS AND PHOTOCHEMISTRY OF DIIODOMETHANE AND HEXABROMOIRIDATE - PARADIGM MOLECULES FOR ORGANIC AND INORGANIC CHEMISTRY - STUDIED WITH SUB-50-FS BROADBAND PUMP-PROBE SPECTROSCOPY by : Sergey M. Matveev
Download or read book PHOTOPHYSICS AND PHOTOCHEMISTRY OF DIIODOMETHANE AND HEXABROMOIRIDATE - PARADIGM MOLECULES FOR ORGANIC AND INORGANIC CHEMISTRY - STUDIED WITH SUB-50-FS BROADBAND PUMP-PROBE SPECTROSCOPY written by Sergey M. Matveev and published by . This book was released on 2016 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt: The present work is the detailed study of photophysical and photochemical processes in molecules by means of femtosecond (fs) time-resolved transient absorption spectroscopy both in the gas and solution phases. This knowledge is important for an understanding of many light-driven mechanisms in photosensitive systems -- building blocks of light-triggered molecular devices. Many light-driven reactions occur on a time scale comparable to that of vibration motion, and therefore, can only be "seen" by using advanced methods such as the fs transient absorption. This method provides ultrahigh temporal resolution on a vibrational period timescale, which is superior to other time-resolved methods and, importantly, can be utilized to study the dynamics of molecular systems. Specifically, ultrafast transient absorption spectroscopy was used to investigate radiationless relaxation dynamics of two paradigm transition metal complexes in octahedral (IrBr62 ) and tetrahedral (CuCl42-) environment. Following excitation at 2000-nm, both systems undergo internal conversion to the ground electronic state with significant difference in lifetimes (55-fs and 360 -ps for CuCl42- and IrBr62-, respectively). The difference was explained by the presence of conical intersection between the excited and ground electronic states in the Cu2+ system due to strong Jahn Teller effect and the strong spin-orbit coupling in the Ir4+ complex. Upon visible irradiation, IrBr62- was found to undergo cascade-like relaxation through the long-lived (360 ps) metal-centered 2Ug'(T2g) excited state. Transient absorption studies upon 330 nm excitation evidence ultrafast intersystem crossing in the initially-excited state to form an excited state in quartet multiplicity. This state decays via a series of internal conversion steps into the lowest-energy quartet excited state. We found that the electron transfer within the t2g metal orbital is found to be the rate-limited step for non-radiative relaxation of IrBr62-. For the first time, the photochemical reaction pathway was documented in the UV photochemistry of CH2I2 molecule. It was shown that CH2I2 excited into the S1 state undergoes direct ~50-fs isomerization through a conical intersection forming the isomeric species with the iodine-iodine bond. Methodologically, this work demonstrated the synergy between fs transient absorption spectroscopy and surface hopping dynamics simulations in revealing the evolution of complicated ultrafast photochemical reactions in small polyatomic molecules.
Book Synopsis Ultrafast Dynamics In Molecules, Nanostructures And Interfaces - Selected Lectures Presented At Symposium On Ultrafast Dynamics Of The 7th International Conference On Materials For Advanced Technologies by : Guglielmo Lanzani
Download or read book Ultrafast Dynamics In Molecules, Nanostructures And Interfaces - Selected Lectures Presented At Symposium On Ultrafast Dynamics Of The 7th International Conference On Materials For Advanced Technologies written by Guglielmo Lanzani and published by World Scientific. This book was released on 2014-01-22 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt: Primary events in natural systems or devices occur on extremely short time scales, and yet determine in many cases the final performance or output. For this reason research in ultrafast science is of primary importance and impact in both fundamental research as well as its applications. This book reviews the advances in the field, addressing timely and open questions such as the role of quantum coherence in biology, the role of excess energy in electron injection at photovoltaic interfaces or the dynamics in quantum confined structures (e.g. multi carrier generation). The approach is that of a monograph, with a broad tutorial introduction and an overview of the recent results. This volume includes selected lectures presented at Symposium on Ultrafast Dynamics of the 7th International Conference on Materials for Advanced Technologies.
Book Synopsis Nanohybrids in Environmental & Biomedical Applications by : Surender Kumar Sharma
Download or read book Nanohybrids in Environmental & Biomedical Applications written by Surender Kumar Sharma and published by CRC Press. This book was released on 2019-07-09 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt: Heterostructured nanoparticles have the capability for a broad range of novel and enhanced properties, which leads to appealing biomedical and environmental applications. This timely new book addresses the design and preparation of multiphase nanomaterials with desired size, shape, phase composition, and crystallinity, as well as their current applications. It emphasizes key examples to motivate deeper studies, including nanomaterial-based hyperthermia treatment of cancer, nanohybrids for water purification, nanostructures used in the removal or detection of bioagents from waste water, and so on. Features Presents state of the art research on heterostructured nanomaterials, from their synthesis and physiochemical properties to current environmental and biological applications. Includes details on toxicity and risk assessment of multifunctional nanomaterials. Discusses recent developments and utilization in healthcare by leading experts. Introduces the main features of functionalization of nanomaterials in terms of desired size, shape, phase composition, surface functionalization/coating, toxicity, and geometry. Emphasizes practical applications in the environmental and biomedical sectors.
Book Synopsis Nonadiabatic Transition by : Hiroki Nakamura
Download or read book Nonadiabatic Transition written by Hiroki Nakamura and published by World Scientific. This book was released on 2012 with total page 515 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nonadiabatic transition is a highly multidisciplinary concept and phenomenon, constituting a fundamental mechanism of state and phase changes in various dynamical processes of physics, chemistry and biology, such as molecular dynamics, energy relaxation, chemical reaction, and electron and proton transfer. Control of molecular processes by laser fields is also an example of time-dependent nonadiabatic transition. In this new edition, the original chapters are updated to facilitate enhanced understanding of the concept and applications. Three new chapters OCo comprehension of nonadiabatic chemical dynamics, control of chemical dynamics, and manifestation of molecular functions OCo are also added.
Download or read book Inorganic Photochemistry written by and published by Academic Press. This book was released on 2011-07-14 with total page 461 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Advances in Inorganic Chemistry series present timely and informative summaries of the current progress in a variety of subject areas within inorganic chemistry, ranging from bio-inorganic to solid state studies. This acclaimed serial features reviews written by experts in the field and serves as an indispensable reference to advanced researchers. Each volume contains an index, and each chapter is fully referenced. Features comprehensive reviews on the latest developments Includes contributions from leading experts in the field Serves as an indispensable reference to advanced researchers
Book Synopsis Ultrafast Dynamics and Laser Action of Organic Semiconductors by : Zeev Valy Vardeny
Download or read book Ultrafast Dynamics and Laser Action of Organic Semiconductors written by Zeev Valy Vardeny and published by CRC Press. This book was released on 2009-01-21 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt: Spurred on by extensive research in recent years, organic semiconductors are now used in an array of areas, such as organic light emitting diodes (OLEDs), photovoltaics, and other optoelectronics. In all of these novel applications, the photoexcitations in organic semiconductors play a vital role. Exploring the early stages of photoexcitations that
Book Synopsis Springer Handbook of Inorganic Photochemistry by : Detlef Bahnemann
Download or read book Springer Handbook of Inorganic Photochemistry written by Detlef Bahnemann and published by Springer Nature. This book was released on 2022-06-25 with total page 1914 pages. Available in PDF, EPUB and Kindle. Book excerpt: The handbook comprehensively covers the field of inorganic photochemistry from the fundamentals to the main applications. The first section of the book describes the historical development of inorganic photochemistry, along with the fundamentals related to this multidisciplinary scientific field. The main experimental techniques employed in state-of-art studies are described in detail in the second section followed by a third section including theoretical investigations in the field. In the next three sections, the photophysical and photochemical properties of coordination compounds, supramolecular systems and inorganic semiconductors are summarized by experts on these materials. Finally, the application of photoactive inorganic compounds in key sectors of our society is highlighted. The sections cover applications in bioimaging and sensing, drug delivery and cancer therapy, solar energy conversion to electricity and fuels, organic synthesis, environmental remediation and optoelectronics among others. The chapters provide a concise overview of the main achievements in the recent years and highlight the challenges for future research. This handbook offers a unique compilation for practitioners of inorganic photochemistry in both industry and academia.
Book Synopsis Organic Optoelectronics by : Wenping Hu
Download or read book Organic Optoelectronics written by Wenping Hu and published by John Wiley & Sons. This book was released on 2012-11-05 with total page 503 pages. Available in PDF, EPUB and Kindle. Book excerpt: Written by internationally recognized experts in the field with academic as well as industrial experience, this book concisely yet systematically covers all aspects of the topic. The monograph focuses on the optoelectronic behavior of organic solids and their application in new optoelectronic devices. It covers organic field-effect and organic electroluminescent materials and devices, organic photonics, materials and devices, as well as organic solids in photo absorption and energy conversion. Much emphasis is laid on the preparation of functional materials and the fabrication of devices, from materials synthesis and purification, to physicochemical properties and the basic processes and working principles of the devices. The only book to cover fundamentals, applications, and the latest research results, this is a handy reference for both researchers and those new to the field. From the contents: * Electronic process in organic solids * Organic/polymeric semiconductors for field-effect transistors * Organic/polymeric field-effect transistors * Organic circuits and organic single molecular transistors * Polymer light-emitting Diodes (PLEDs): devices and materials * Organic solids for photonics * Organic photonic devices * Organic solar cells based on small molecules * Polymer solar cells * Dye-sensitized solar cells (DSSCs) * Organic thermoelectric power devices
