Intramolecular Charge Transfer
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Intramolecular Charge Transfer
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Author : Ramprasad Misra
language : en
Publisher: John Wiley & Sons
Release Date : 2018-02-27
Intramolecular Charge Transfer written by Ramprasad Misra and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-02-27 with Science categories.
Bridging the gap between the multitude of advanced research articles and the knowledge newcomers to the field are looking for, this is a timely and comprehensive monograph covering the interdisciplinary topic of intramolecular charge transfer (ICT). The book not only covers the fundamentals and physico-chemical background of the ICT process, but also places a special emphasis on the latest experimental and theoretical studies that have been undertaken to understand this process and discusses key technological applications. After outlining the discovery of ICT molecules, the authors go on to discuss several important substance classes. They present the latest techniques for studying the underlying processes and show the interplay between charge transfer and the surrounding medium. Examples taken from nonlinear optics, viscosity and polarity sensors, and organic electronics testify to the vast range of applications. The result is a unique information source for experimentalists as well as theoreticians, from postgraduate students to researchers.
Photoinduced Intramolecular Charge Transfer In Donor Acceptor Biaryls And Resulting Applicational Aspects Regarding Fluorescent Probes And Solar Energy Conversion
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Author : Michael Maus
language : en
Publisher: Universal-Publishers
Release Date : 1998
Photoinduced Intramolecular Charge Transfer In Donor Acceptor Biaryls And Resulting Applicational Aspects Regarding Fluorescent Probes And Solar Energy Conversion written by Michael Maus and has been published by Universal-Publishers this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with Technology & Engineering categories.
This study is focused on the effects of photoinduced intramolecular charge transfer (CT) in three differently twisted donor-acceptor (D-A) biphenyls. Taking into account a further pair of differently twisted D-A biaryls new universal insights into the photoinduced electronic and conformation dynamics of D-A biaryls are obtained. Furthermore, possible applications in fields of solar energy conversion and fluorescence sensing of microenvironments are demonstrated. Experimental means of stationary and time-resolved (ps to s) luminescence, transient absorption (sub-ps), polarization spectroscopy, high pressure and low temperature techniques are employed in conjunction with quantum chemical calculations. Twist angle and solvent dependent electron transfer (ET) interactions between the D and A aryl moieties are responsible for the low lying and solvatochromic intramolecular CT electron band which gains unusually high intensity through strong electronic coupling of the pure 1ET with the ground (S0) and 1La state. As regards the class of biaryl compounds, for the first time, an excited state electron transfer from the D to the A could be monitored by dual spectrally separated stimulated fluorescence bands with precursor-successor relationship on a sub-ps timescale for the D-A biphenyls. It is concluded that, in additon to the electronic interaction of 1ET with S0 and 1La, the electronic interaction with a close lying 1Lb state plays a fundamental role in the ET dynamics and the 1CT-S0 transition probability in D-A biaryls. The initial photoinduced conformational relaxation occurs towards planarity in all biaryls investigated. However, various results evidence that the highly twisted D-A biphenyl additionally performs a slow "excited state intramolecular back twist rotation" leading to a solvent polarity dependent conformational equilibrium between a more planar (CT) and a more twisted (CTR) conformer in S1(1CT). Using global analysis of the biexponential fluorescence decays as a function of temperature and pressure in medium polar solvents, the kinetics, thermodynamics, viscosity control and decomposed emission spectra associated with this adiabatic photoreaction are determined. The twist angle dependent ability of the D-A biphenyls to serve as fluorescent probes of micropolarity, changes of microviscosity or matrix order, protic solvents and pH is investigated. In particular, fluorescence sensing of pH seems to be promising.
Intramolecular Charge Transfer In Solvated Organic Molecules
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Author : Mercedes V. Bohnwagner
language : en
Publisher:
Release Date : 2018
Intramolecular Charge Transfer In Solvated Organic Molecules written by Mercedes V. Bohnwagner and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with categories.
Effect Of Pressure On Intramolecular Charge Transfer And Spin Crossover Materials
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Author : William Scott Hammack
language : en
Publisher:
Release Date : 1988
Effect Of Pressure On Intramolecular Charge Transfer And Spin Crossover Materials written by William Scott Hammack and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with categories.
Effects Of High Pressure On The Luminescence Of Intramolecular Charge Transfer Compounds
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Author : Alonzo Milton Rollinson
language : en
Publisher:
Release Date : 1980
Effects Of High Pressure On The Luminescence Of Intramolecular Charge Transfer Compounds written by Alonzo Milton Rollinson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1980 with categories.
Part I Intramolecular Charge Transfer Quenching Of Excited States By Sulfur Part Ii Radical Gb S Cleavage Via Excited States And Photogenerated Diradicals
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Author : Michael Jeffrey Lindstrom
language : en
Publisher:
Release Date : 1978
Part I Intramolecular Charge Transfer Quenching Of Excited States By Sulfur Part Ii Radical Gb S Cleavage Via Excited States And Photogenerated Diradicals written by Michael Jeffrey Lindstrom and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1978 with Charge transfer categories.
Ultrafast Photophysics And Photochemistry After Excited State Intramolecular Charge Transfer In The Liquid Phase
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Author : Hanna A. Ernst
language : en
Publisher:
Release Date : 2015
Ultrafast Photophysics And Photochemistry After Excited State Intramolecular Charge Transfer In The Liquid Phase written by Hanna A. Ernst and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with Charge transfer categories.
The ultrafast excited state dynamics of the small donor-acceptor molecules ortho-, meta- and para-nitrophenol, their corresponding phenolates as well as selected type-I photoinitiators have been studied by means of steady state UV-Vis and femtosecond time-resolved transient absorption spectroscopy in the liquid phase. The investigated compounds are characterized by intramolecular charge transfer in the ultra violet. The experimental findings were assisted by ab initio calculations at the (TD)-DFT and the CASSCF level of theory.
Aggregation Induced Emission Aie
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Author : Jianwei Xu
language : en
Publisher: Elsevier
Release Date : 2022-04-17
Aggregation Induced Emission Aie written by Jianwei Xu and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-04-17 with Technology & Engineering categories.
Aggregation-Induced Emission (AIE): A Practical Guide introduces readers to the topic, guiding them through fundamental concepts and the latest advances in applications. The book covers concepts, principles and working mechanisms of AIE in AIE-active luminogens, with different classes of AIE luminogens reviewed, including polymers, three-dimensional frameworks (MOFs and COFs) and supramolecular gels. Special focus is given to the structure-property relationship, structural design strategies, targeted properties and application performance. The book provides readers with a deep understanding, not only on the fundamental principles of AIE, but more importantly, on how AIE luminogens and AIE properties can be incorporated in material development. Provides the fundamental principles, design and synthesis strategies of aggregation induced emission materials Reviews the most relevant applications in materials design for stimuli-responsive materials, biomedical applications, chemo-sensing and optoelectronics Emphasizes structural design and its connection to aggregation induced emission properties, also exploring the structure-property relationship
Advances In Electron Transfer Chemistry
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Author : Patrick S. Mariano
language : en
Publisher: Elsevier
Release Date : 2013-10-22
Advances In Electron Transfer Chemistry written by Patrick S. Mariano and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-10-22 with Science categories.
Advances in Electron Transfer Chemistry, Volume 3 presents studies that discuss findings in the various aspects of electron chemistry. The book is comprised of four chapters; each chapter reviews a work that tackles an issue in electron transfer chemistry. Chapter 1 discusses the photoinduced electron transfer in flexible biaryl donor-acceptor molecules. Chapter 2 tackles light-induced electron transfer in inorganic systems in homogeneous and heterogeneous phases. The book also covers internal geometry relaxation effects on electron transfer rates of amino-centered systems. The sequential electron transfer reactions catalyzed by cytochrome p-450 enzymes are also dealt with. The text will be of great use to researchers interested in the field of electron transfer chemistry.
Charge Transfer Processes In Condensed Media
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Author : J. Ulstrup
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Charge Transfer Processes In Condensed Media written by J. Ulstrup and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Science categories.
Molecules in liquid and solid media are exposed to strong inter action forces from the surrounding medium. The formulation of a comprehensive theory of chemical processes in condensed media is consequently an elaborate task involving concepts from several areas of the natural sciences. Within the las~ two and a half decades very notable results towards the formulation of a 'unified' quantum mechanical theory of such processes have in fact been achieved, and by the variety of physical, chemical, and biological processes which can be suitably covered by this framework, the new theory represents an adequate alternative to the transition state theory. The present work has a two-fold purpose. Firstly, to provide a reasonably organized exposition of some basic aspects of these developments. This part emphasizes the fundamental similarities between chemical and other kinds of radiationless processes and includes the derivation of the most important rate expressions without resorting to involved mathematical techniques. The s- ond major purpose is to illustrate the 'unified' character of the rate theory by analysis of a considerable amount of expe- mental data from both 'conventional' kinetics and from such untraditional areas as low-temperature, strongly exothermic, and biological processes. Particular attention is here given to those systems for which a classical description is inadequate, and which provide a diagnostic distinction between several alternative theoretical approaches.