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Author : Haim Levanon
Publisher :
ISBN 13 :
Total Pages : 300 pages
Book Rating : 4.:/5 (258 download)
Download or read book Microenvironment in Photoinduced Electron Transfer written by Haim Levanon and published by . This book was released on 1995 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Michael Maus
Publisher : Universal-Publishers
ISBN 13 : 1581120303
Total Pages : 223 pages
Book Rating : 4.5/5 (811 download)
Download or read book Photoinduced Intramolecular Charge Transfer in Donor-Acceptor Biaryls and Resulting Applicational Aspects Regarding Fluorescent Probes and Solar Energy Conversion written by Michael Maus and published by Universal-Publishers. This book was released on 1998 with total page 223 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Author : George J. Kavarnos
Publisher : Wiley-VCH
ISBN 13 :
Total Pages : 376 pages
Book Rating : 4.3/5 (91 download)
Download or read book Fundamentals of Photoinduced Electron Transfer written by George J. Kavarnos and published by Wiley-VCH. This book was released on 1993 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 10 pages
Book Rating : 4.:/5 (727 download)
Download or read book Photoinduced Electron Transfer and Fluorescence Mechanisms in Covalently Linked Polynuclear Aromatic-nucleotide Complexes written by and published by . This book was released on 1992 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: The fluorescence of polycyclic aromatic hydrocarbon-nucleic acid complexes is quenched by photoinduced electron transfer mechanisms in aqueous solutions at ambient temperatures. These effects are illustrated with the biologically important compound benzo[a]pyrene-7,8-diol-9,10-epoxide (BPDE), a mutagenic and carcinogenic metabolite of the environmental pollutant benzo[a]pyrene, which forms covalent mutagenic lesions with 2(prime)-deoxyguanosine (dG) residues in DNA. The dependence of the fluorescence yeild and fluorescence decay times of the covalent model adduct (+)-trans-BPDE-N2-dG as a function of temperature and methanol/water composition are described. Because of the sensitivity of the fluorescence of the pyrenyl residue to the polarity of the microenvironment, the magnitude of the fluorescence yield can be used to distinguish between highly hydrophobic (e.g. intercalation) and other more solvent-exposed BPDE-nucleic acid binding sites.
Author : N. Mataga
Publisher : Elsevier
ISBN 13 : 0444598847
Total Pages : 587 pages
Book Rating : 4.4/5 (445 download)
Download or read book Dynamics and Mechanisms of Photoinduced Electron Transfer and Related Phenomena written by N. Mataga and published by Elsevier. This book was released on 2012-12-02 with total page 587 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains papers which examine fundamental aspects of photoinduced electron transfer reactions, an area in which a number of breakthroughs have recently occurred. The book is divided into four parts. Parts I and II are mainly concerned with the fundamental aspects of the inter- and intra-molecular charge transfer, electron transfer and related phenomena such as solvent effects, solvation dynamics, energy gap dependences and radical pair dynamics. Part III is concerned with electron transfer and energy transfer phenomena in polymers, films, crystals, and other confined systems. In Part IV, the mechanisms of the energy and electron transfer in biological photosynthetic systems, proteins and reaction center systems are discussed.
Author : David F. Eaton
Publisher : Springer
ISBN 13 :
Total Pages : 256 pages
Book Rating : 4.:/5 (318 download)
Download or read book Photoinduced Electron Transfer I written by David F. Eaton and published by Springer. This book was released on 1990-09-17 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Photoinduced Electron Transfer written by and published by . This book was released on 1990 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : A. Albini
Publisher : Springer
ISBN 13 :
Total Pages : 296 pages
Book Rating : 4.:/5 (318 download)
Download or read book Photoinduced Electron Transfer V written by A. Albini and published by Springer. This book was released on 1993-09-22 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt: 1. P. Maslak: Fragmentations by Photoinduced Electron Transfer. Fundamentals and Practical Aspects 2. P.K. Freeman, S.A. Hatlevig: The Photochemistry of Polyhalocompounds, Dehalogenation by Photoinduced Electron Transfer, New Methods of Toxic Waste Disposal 3. J.-P. Soumillion: Photoinduced Electron Transfer Employing Organic Anions 4. A. Albini, E. Fasani, M. Mella: PET-Reactions of Aromatic Compounds 5. G. Pandey: Photoinduced Electron Transfer (PET) in Organic Synthesis 6.R.A. Bissell, A.P. de Silva, H.Q.N. Gunaratne, P.L.M. Lynch, G.E.M. Maguire, C.P. McCoy, K.R.A.S. Sandanayake: Fluorescent PET (Photoinduced Electron Transfer) Sensors
Author : Marye Anne Fox
Publisher :
ISBN 13 :
Total Pages : 784 pages
Book Rating : 4.:/5 (318 download)
Download or read book Photoinduced Electron Transfer: Photoinduced electron transfer reactions, organic substrates written by Marye Anne Fox and published by . This book was released on 1988 with total page 784 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Jochen Mattay
Publisher :
ISBN 13 : 9783662150641
Total Pages : 220 pages
Book Rating : 4.1/5 (56 download)
Download or read book Photoinduced Electron Transfer II written by Jochen Mattay and published by . This book was released on 2014-01-15 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Jochen Mattay
Publisher : Springer
ISBN 13 : 9783662149508
Total Pages : 270 pages
Book Rating : 4.1/5 (495 download)
Download or read book Photoinduced Electron Transfer V written by Jochen Mattay and published by Springer. This book was released on 2014-03-12 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Jan F. Rabek
Publisher : CRC Press
ISBN 13 : 9780849348457
Total Pages : 290 pages
Book Rating : 4.3/5 (484 download)
Download or read book Lasers in Polymer Science and Technology written by Jan F. Rabek and published by CRC Press. This book was released on 1989-11-30 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this 4-volume set is to examine some of the applications of lasers in polymer science and technology. Information on this fascinating subject is compiled and presented in compact form. This set focuses on current research and developments in the application of lasers in polymer and biopolymer chemistry. It includes experimental and theoretical details, apparatus, techniques, and applications. This set is a useful source for researchers, students, polymer chemists, and physicists involved in this astonishing field of high technology.
Author :
Publisher :
ISBN 13 : 9780387551173
Total Pages : 250 pages
Book Rating : 4.5/5 (511 download)
Download or read book Photoinduced Electron Transfer IV written by and published by . This book was released on 1992 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Jochen Mattay
Publisher : Springer
ISBN 13 : 9783662150160
Total Pages : 259 pages
Book Rating : 4.1/5 (51 download)
Download or read book Photoinduced Electron Transfer III written by Jochen Mattay and published by Springer. This book was released on 2014-03-12 with total page 259 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Marye Anne Fox
Publisher : Elsevier Publishing Company
ISBN 13 :
Total Pages : 672 pages
Book Rating : 4.3/5 (91 download)
Download or read book Photoinduced Electron Transfer: Conceptual basis written by Marye Anne Fox and published by Elsevier Publishing Company. This book was released on 1988 with total page 672 pages. Available in PDF, EPUB and Kindle. Book excerpt: Electron transfer reactions are of great importance to nearly every subdiscipline of chemistry. The simple transfer of a single electron has been shown repeatedly to be a common activating mode for organic, inorganic, and biological molecules, and the very ubiquity of such reactions has guaranteed that their investigation would involve the most fundamental questions of modern chemistry. The fact that photoexcitation induces enhanced redox reactivity via electron transfer also provides a convenient method for experimentally testing theoretical predictions regarding structural and energetic effects. As can be seen from the very size of this work there is a great deal known about photoinduced electron transfer reactions and the editors have tried to capture the diversity and excitement inherent in this broad field. The reader will find contributions from theorists and experimentalists, from organic and inorganic chemists, from the perspective of the synthetic and mechanistic viewpoint. Some contributions are fundamental basic research, while others clearly show practical applications of these principles.These volumes are intended to serve a joint purpose: as a reference resource and an introductory overview to the diverse research accomplished via photoexcitation of electron donor-acceptor systems. The information is organized in four parts. The first deals with the theoretical and conceptual factors which influence electron transfer. The second covers experimental methodology and medium effects. The third and fourth deal with reactivity, with most organic transformation being addressed in Part C and most inorganic reactions covered in Part D. Each part thus provides an overview of typical reactions observed for these classes of compounds. Part D also provides examples of photoinduced electron transfer in current use in important applications. There is of course a significant interdependence between the four parts. Subject, chemical, and author citation indices appear at the end of each of Parts A, B and C, and comprehensive indices are included in Part D.
Author : Bichitra Nandi Ganguly
Publisher : Materials Research Forum LLC
ISBN 13 : 1945291737
Total Pages : 209 pages
Book Rating : 4.9/5 (452 download)
Download or read book Nanomaterials in Bio-Medical Applications written by Bichitra Nandi Ganguly and published by Materials Research Forum LLC. This book was released on 2018-07-01 with total page 209 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book presents new results in the areas of nanomaterials, nanoparticles, ultra-small nanoparticles, plasmonic nanoparticles and coated nanoparticles for bio-medical applications. Emphasis is placed on (1) synthetic routes (quantum dots, thermal decomposition methods), (2) characterization methods (photo-physical techniques, X-ray diffraction, electron microscopy, light scattering, positron annihilation spectroscopy) and (3) bio-medical applications (nanomaterials and nanoparticles in physiology, medicine and bio-medicine).
Author : Michael Gratzel
Publisher : CRC Press
ISBN 13 : 1351090100
Total Pages : 363 pages
Book Rating : 4.3/5 (51 download)
Download or read book Heterogenous Photochemical Electron Transfer written by Michael Gratzel and published by CRC Press. This book was released on 2018-01-18 with total page 363 pages. Available in PDF, EPUB and Kindle. Book excerpt: The present monograph attempts to unify these diverse and exciting new developments within a common framework. First, the physical principles underlying heterogenous electron-transfer processes are outlined in a concise way and are compared to the homogeneous counterpart. This analysis includes the notion of the Fermi level in liquids and solids as well as the distribution of electronic energy levels in solids and liquids. A comparison is made between the salient kinetic features of homogeneous and heterogeneous electron transfer reactions. This establishes the basis for the subsequent treatment of the transduction of excitation energy and photo-initiated electron transfer in organized molecular assemblies, such as micelles, vesicles and monolayers. Transmembrane redox processes are critically reviewed. Particular attention is given to semiconductor electrodes and particles. This includes a discussion of quantum size effects, the nature of space charge layers as well as surface states and the dynamics of charge carrier-induced redox reactions at the semiconductor solution interface. These processes are of fundamental importance in such diverse fields as photochromism, electrochromic displays, electroreprography and photography, information storage, photocatalysis, photodegradation of paints, and solar energy conversion.
