Ultrafast Photophysical and Photochemical Dynamics of Polyhalogenated Alkanes, Cycloalkanes, and Transition Metal Complexes PDF Download
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Author: Darya S Budkina
Publisher:
ISBN:
Category : Energy transfer
Languages : en
Pages : 230
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Book Description
This work aims at deeper understanding of chemical reaction dynamics, ultrafast photochemical and photophysical relaxation pathways, and energy redistribution and dissipation in the liquid phase on a femto-to-picosecond timescale. Breaking and making of chemical bonds, structural reorganization, and energy flow are all the essence of chemistry, and all occur on the time scale of molecular vibrations (tens of femtoseconds). Important insights about the structure of evolving molecules, relaxation phenomena, and ultrafast photochemical and photophysical population dynamics can be obtained using sub-50-fs time-resolved transient absorption spectroscopy. As a result, highly viable and/or unique information about the mechanism of relaxation dynamics and the nature of short-lived intermediates can be gained. Furthermore, ultrashort laser pulses with duration of 100 fs or shorter can help set up and detect coherent motion in vibronic excited and ground states. Coherence observed in product states provides the knowledge about electronic and nuclear motion along the relaxation path. This yields the information about the potential energy surfaces involved in the photochemical or photophysical process that occurs. The knowledge acquired from such experiments can be used as an entry point for control of femtochemical processes in solution. The technical aspect of this work focuses on developing and optimizing the ultrafast transient absorption setup for studying ultra-rapid photochemical relaxation dynamics in the molecules of interest, namely, geminal dibromocycloalkanes and halogen-containing transition metal complexes. Excitation pulses from deep-UV to near-IR were temporally compressed using prisms compressors to generate sub-40 fs laser pulses. Also, stable white-light continuum pulses used for probing were generated in the wide spectral range of 280 - 760 nm. This thesis is divided into two main parts. The first part provides information about ultrafast dynamics (10-fs time resolution after deconvolution) of geminal dibromocycloalkanes. The second part covers ultrafast radiationless relaxation dynamics of halogen-containing transition metal complexes (IrBr62-, IrCl62-, etc.). A particular focus in this part is on excitation into several vibronic states of the different nature (ligand-to-metal charge-transfer (LMCT) and intraconfigurational), where the lowest-excited intraconfigurational state is accessed via direct femtosecond near-IR (2000 nm) excitation.
Author: Darya S Budkina
Publisher:
ISBN:
Category : Energy transfer
Languages : en
Pages : 230
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Book Description
This work aims at deeper understanding of chemical reaction dynamics, ultrafast photochemical and photophysical relaxation pathways, and energy redistribution and dissipation in the liquid phase on a femto-to-picosecond timescale. Breaking and making of chemical bonds, structural reorganization, and energy flow are all the essence of chemistry, and all occur on the time scale of molecular vibrations (tens of femtoseconds). Important insights about the structure of evolving molecules, relaxation phenomena, and ultrafast photochemical and photophysical population dynamics can be obtained using sub-50-fs time-resolved transient absorption spectroscopy. As a result, highly viable and/or unique information about the mechanism of relaxation dynamics and the nature of short-lived intermediates can be gained. Furthermore, ultrashort laser pulses with duration of 100 fs or shorter can help set up and detect coherent motion in vibronic excited and ground states. Coherence observed in product states provides the knowledge about electronic and nuclear motion along the relaxation path. This yields the information about the potential energy surfaces involved in the photochemical or photophysical process that occurs. The knowledge acquired from such experiments can be used as an entry point for control of femtochemical processes in solution. The technical aspect of this work focuses on developing and optimizing the ultrafast transient absorption setup for studying ultra-rapid photochemical relaxation dynamics in the molecules of interest, namely, geminal dibromocycloalkanes and halogen-containing transition metal complexes. Excitation pulses from deep-UV to near-IR were temporally compressed using prisms compressors to generate sub-40 fs laser pulses. Also, stable white-light continuum pulses used for probing were generated in the wide spectral range of 280 - 760 nm. This thesis is divided into two main parts. The first part provides information about ultrafast dynamics (10-fs time resolution after deconvolution) of geminal dibromocycloalkanes. The second part covers ultrafast radiationless relaxation dynamics of halogen-containing transition metal complexes (IrBr62-, IrCl62-, etc.). A particular focus in this part is on excitation into several vibronic states of the different nature (ligand-to-metal charge-transfer (LMCT) and intraconfigurational), where the lowest-excited intraconfigurational state is accessed via direct femtosecond near-IR (2000 nm) excitation.
Author:
Publisher: Elsevier
ISBN: 0443237468
Category : Science
Languages : en
Pages : 330
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Book Description
Photochemistry and Photophysics of Earth-Abundant Transition Metal Complexes, Volume 83 in the Advances in Inorganic Chemistry series, highlights new advances in the field, with this new volume presenting interesting chapters on topics such as Radioluminescence of Copper(I) Clusters, Photophysics and Photochemistry of Chromium(III) Complexes (Molecular Rubies), Chromic behaviors of luminescent copper(I) complexes, Long-lived photoluminescence in group 4 metal complexes enabled by ligand-to-metal charge transfer, Photoactive MOFs for CO2 Activation utilizing Earth Abundant Metals, and more. Other sections cover Earth Abundant Metal Complexes for Optoelectronic Applications, Photoactive metal to ligand charge transfer excited states in 3d6 and 3d8 complexes, Ligand-to-metal charge-transfer excited states in d0 transition-metal complexes: Investigations into the photochemistry and photophysics of emissive titanocenes, Ultrafast dynamics in photoactive copper complexes from optical and Xray methods, and Photophysical properties of Ni(II) complexes and some copper(I) and zinc(II) complexes.
Author: Evgeniia Butaeva
Publisher:
ISBN:
Category : Laser pulses, Ultrashort
Languages : en
Pages : 198
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Book Description
A molecular level understanding of photodynamics in condensed media is one of the recent challenges to chemical physics. This is because of the intrinsic complexity of liquid-phase photophysical and photochemical singularities arising from competing intra- and intermolecular processes. Such processes often take place on a timescale of a few femtoseconds (10-15 s) to several tens of picoseconds (10-12 s). In this work, the model photochemical processes used to investigate ultrafast photo-induced reaction dynamics in solution. The model compounds are non-metal/metal polyhalogenated small molecules. The gas-phase photochemistry of these small molecules is thoroughly examined, which also enables to establish the connection between liquid and gas phase dynamics. Furthermore, contrary to the scrupulously investigated di- and triatomic molecular systems, more vibrational degrees of freedom are accessible both for the model parent molecules, nascent polyatomic radical species, and isomer photoproducts. Therefore, a detailed mapping of the photochemical reaction paths of these molecular systems can possibly reveal different couplings between the reactive modes and other dark states in a far-from-equilibrium situation. The complexity of the encountered ultrafast events requires the utilization of several experimental and computational approaches. Results of femtosecond transient absorption, picosecond transient resonance Raman, excited state ab initio calculations are discussed in this context.
Author: M F Ansell
Publisher: Royal Society of Chemistry
ISBN: 184973271X
Category : Science
Languages : en
Pages : 374
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Book Description
Specialist Periodical Reports provide systematic and detailed review coverage of progress in the major areas of chemical research. Written by experts in their specialist fields the series creates a unique service for the active research chemist, supplying regular critical in-depth accounts of progress in particular areas of chemistry. Fro over 90 years The Royal Society of chemistry and its predecessor, the Chemical Society, have been publishing reports charting developments in chemistry, which originally took the form of Annual Reports. However, by 1967 the whole spectrum of chemistry could no longer be contained within one volume and the series Specialist Periodical Reports was born. The Annual Reports themselves still existed but were divided into two, and subsequently three, volumes covering Inorganic, Organic, and Physical Chemistry. For more general coverage of the highlights in chemistry they remain a 'must'. Since that time the SPR series has altered according to the fluctuating degree of activity in various fields of chemistry. Some titles have remained unchanged, while others have altered their emphasis along with their titles; some have been combined under a new name whereas others have had to be discontinued. The current list of Specialist Periodical Reports can be seen on the inside flap of this volume.
Author: Christian Stevens
Publisher: John Wiley & Sons
ISBN: 0470021047
Category : Science
Languages : en
Pages : 328
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Book Description
Renewable Bioresources: scope and modification for non-food applications is the first text to consider the broad concept of renewable materials from the socio-economic aspects through to the chemical production and technical aspects of treating different raw products. The text sets the context of the renewables debate with key opening chapters on green chemistry, and the current situation of US and EU policy regarding sustainability and industrial waste. The quantitative and technical scope and production of renewable resources is then discussed with material looking at integral valorisation, the primary production of raw materials, downstream processing, and the identification of renewable crop materials. The latter part of the book concludes with a discussion on the uses for renewable materials such as carbohydrates, woods, fibres, biopolymers, lipids and proteins in different industrial applications, including a key chapter on the high value-added industries. Covers the broad concept of renewable resources from different points of view. Takes readers through the identification, production, processing and end-applications for renewable raw materials. Considers and compares EU and US renewable resources and sustainability objectives. Devotes one chapter to green chemistry and sustainability, focussing on the green industrial processes. This is an essential book for upper level undergraduates and Masters students taking modules on Renewable Resources, Green Chemistry, Sustainable Development, Environmental Science, Agricultural Science and Environmental Technology. It will also benefit industry professionals and product developers who are looking at improved economic and environmental means of utilising renewable materials.
Author: Norman S. Allen
Publisher: Elsevier Science & Technology
ISBN:
Category : Crafts & Hobbies
Languages : en
Pages : 304
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Book Description
Author: Jürgen Haffer
Publisher: Springer Science & Business Media
ISBN: 9783540717782
Category : Biography & Autobiography
Languages : en
Pages : 492
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Book Description
This book is the first detailed biography of Ernst Mayr. He was an ‘architect’ of the Synthetic Theory of Evolution, and the greatest evolutionary biologist since Charles Darwin. He is one of the most widely known biologists of the 20th century.
Author: Ian Dunkin
Publisher: Royal Society of Chemistry
ISBN: 1847554830
Category : Science
Languages : en
Pages : 278
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Book Description
The breadth of scientific and technological interests in the general topic of photochemistry is truly enormous and includes, for example, such diverse areas as microelectronics, atmospheric chemistry, organic synthesis, non-conventional photoimaging, photosynthesis, solar energy conversion, polymer technologies, and spectroscopy. This Specialist Periodical Report on Photochemistry aims to provide an annual review of photo-induced processes that have relevance to the above wide-ranging academic and commercial disciplines, and interests in chemistry, physics, biology and technology. In order to provide easy access to this vast and varied literature, each volume of Photochemistry comprises sections concerned with photophysical processes in condensed phases, organic aspects which are sub-divided by chromophore type, polymer photochemistry, and photochemical aspects of solar energy conversion. Specialist Periodical Reports provide systematic and detailed review coverage in major areas of chemical research. Compiled by teams of leading authorities in the relevant subject areas, the series creates a unique service for the active research chemist, with regular, in-depth accounts of progress in particular fields of chemistry. Subject coverage within different volumes of a given title is similar and publication is on an annual or biennial basis.
Author: Enzo Alessio
Publisher: Structure and Bonding
ISBN:
Category : Science
Languages : en
Pages : 336
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Book Description
With contributions by numerous experts
Author: Myungchul Kim
Publisher:
ISBN: 9781475788242
Category :
Languages : en
Pages : 476
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Book Description
