Download or read book Conformational Analysis of Molecules in Excited States written by Jacek Waluk and published by John Wiley & Sons. This book was released on 2000-06-13 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt: A unique look at some of the hottest topics in photophysics and photochemistry today The study of molecules in excited states has exploded over the past decade, providing new insights into conformational changes in organic molecules and opening up research opportunities for scientists and professionals in chemistry, physics, biology, medicine, and materials engineering. Using conformational analysis as a unifying concept, this important new work provides readers with a cohesive and cutting-edge overview of this fascinating and challenging field. From conformational changes accompanying photoinduced electron transfer to elementary photophysical and photochemical processes in living systems, the most representative and challenging topics are carefully gleaned from the vast literature, highlighting major conceptual problems along with the relevant experimental techniques. Authoritative, detailed contributions from both experimentalists and theoreticians include coverage of: * Conformational changes in intramolecular excited state electron transfer * Conformational aspects of excited state proton transfer * The novel topic of solute-solvent friction in chemical reactions * Mechanisms and structural aspects of exciplex formations * Conformational aspects of organic photochemistry * Calculations of excited state conformational properties

Download or read book Structures and Conformations of Non Rigid Molecules written by J. Laane and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 640 pages. Available in PDF, EPUB and Kindle. Book excerpt: From the beginnings of modern chemistry, molecular structure has been a lively area of research and speculation. For more than half a century spectroscopy and other methods have been available to characterize the structures and shapes of molecules, particularly those that are rigid. However, most molecules are at least to some degree non-rigid and this non-rigidity plays an important role in such diverse areas as biological activity, energy transfer, and chemical reactivity. In addition, the large-amplitude vibrations present in non-rigid molecules give rise to unusual low-energy vibrational level patterns which have a dramatic effect on the thermodynamic properties of these systems. Only in recent years has a coherent picture of the energetics and dynamics of the conformational changes inherent in non-rigid (and semi-rigid) molecules begun to emerge. Advances have been made in a number of different experimental areas: vibrational (infrared and Raman) spectroscopy, rotational (microwave) spectroscopy, electron diffraction, and, most recently, laser techniques probing both the ground and excited electronic states. Theoretically, the proliferation of powerful computers coupled with scientific insight has allowed both empirical and ab initio methods to increase our understanding of the forces responsible for the structures and energies of non-rigid systems. The development of theory (group theoretical methods and potential energy surfaces) to understand the unique characteristics of the spectra of these floppy molecules has also been necessary to reach our present level of understanding. The thirty chapters in this volume contributed by the key speakers at the Workshop are divided over the various areas. Both vibrational and rotational spectroscopy have been effective at determining the potential energy surfaces for non-rigid molecules, often in a complementary manner. Recent laser fluorescence work has extended these types of studies to electronic excited states. Electronic diffraction methods provide radial distribution functions from which both molecular structures and compositions of conformational mixtures can be found. Ab initio calculations have progressed substantially over the past few years, and, when carried out at a sufficiently high level, can accurately reproduce (or predict ahead of time) experimental findings. Much of the controversy of the ARW related to the question of when an ab initio is reliable. Since the computer programs are readily available, many poor calculations have been carried out. However, excellent results can be obtained from computations when properly done. A similar situation exists for experimental analyses. The complexities of non-rigid molecules are many, but major strides have been taken to understand their structures and conformational processes.

Download or read book Modern Conformational Analysis written by Helena Dodziuk and published by John Wiley & Sons. This book was released on 1996-12-17 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt: Viele Bücher über organische Zusammensetzungen behandeln die Stereochemie, schenken aber der räumlichen Struktur der organischen Moleküle, vor allem der weniger gebräuchlichen, kaum Beachtung. Diese Monographie stellt nun ein umfassendes Werk zur organischen Struktur und der Konformationsanalyse dar. Das Interesse des Autors an der Formenvielfalt der organischen Moleküle spiegelt sich besonders intensiv in der Betrachtung der Molekülordnung wider, die in organisch chemischen und biologischen Systemen von großer Bedeutung ist. Der neue Band in der Reihe 'Methods in Stereochemical Analysis' stellt vor allem diese Bedeutung der Molekülgestalt und die Einwirkung theoretischer Studien und synthetischer Chemie zu diesem Themenkomplex in den Vordergrund.

Download or read book Advanced Fluorescence Reporters in Chemistry and Biology I written by Alexander P. Demchenko and published by Springer Science & Business Media. This book was released on 2010-09-08 with total page 393 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fluorescence reporter is the key element of any sensing or imaging technology. Its optimal choice and implementation is very important for increasing the sensitivity, precision, multiplexing power, and also the spectral, temporal, and spatial reso- tion in different methods of research and practical analysis. Therefore, design of ?uorescence reporters with advanced properties is one of the most important problems. In this volume, top experts in this ?eld provide advanced knowledge on the design and properties of ?uorescent dyes. Organic dyes were the ?rst ?uorescent materials used for analytical purposes, and we observe that they retain their leading positions against strong competition of new materials – conjugated polymers, semiconductor nanocrystals, and metal chelating complexes. Recently, molecular and cellular biology got a valuable tool of organic ?uorophores synt- sized by cell machinery and incorporated into green ?uorescent protein and its analogs. Demands of various ?uorescence techniques operating in spectral, anisotropy, and time domains require focused design of ?uorescence reporters well adapted to these techniques. Near-IR spectral range becomes more and more attractive for various applications, and new dyes emitting in this range are strongly requested. Two-photonic ?uorescence has become one of the major tools in bioimaging, and ?uorescence reporters well adapted to this technique are in urgent need. These problems cannot be solved without the knowledge of fundamental principles of dye design and of physical phenomena behind their ?uorescence response.

Download or read book Stereochemistry of Organic Compounds written by D. Nasipuri and published by New Age International. This book was released on 1994 with total page 596 pages. Available in PDF, EPUB and Kindle. Book excerpt: During Recent Years, Stereochemistry Has Undergone A Phenomenal Growth Both In Theory And Practice, With A Concomitant Increase Of Interest Among The Organic Chemists, Biological Chemists, Medicinal Chemists, And Pharmacologists. The Present Text Provides An Up-To-Date, Coherent; And Comprehensive Account Of The Subject Starting From The Fundamentals And Leading Up To The Latest Development As Far As Practicable. Emphasis Has Been Placed On Symmetry-Based Approach To Molecular Chirality, Stereochemical Terminologies (Modern Stereochemistry Is Replete, With Them), Topicity And Prostereoisomerism, Conformational Analysis, Dynamic Stereochemistry, Chiroptical Properties, And Assignment Of Absolute Configuration To Chiral Molecules.Dynamic Stereochemistry Has Been Discussed With Reference To Conformation-Reactivity Correlation, Stereoselective Syntheses, And Pericyclic Reactions. A Large Cross Section Of Organic Reactions With Stereochemical Implication Has Been Incorporated. Attempts Have Been Made To Familiarise The Readers With Modem Instrumental Techniques, Nuclear Magnetic Resonance In Particular, Used For Stereochemical Investigation. Each Chapter Is Provided With A Summary Which Highlights The Main Points Of The Text. Selective References, Mostly Of Textbooks, Monographs, Review Articles, And Significant Original Papers Have Been Given Extending Sometimes To Early 1991.The Book Is Expected To Fulfil The Long-Felt Need For A Comprehensive Text On Modern Organic Stereochemistry Which Is Conspicuously Absent Since The Publication Of Professor Eliels Book In 1962. The Text May Be Adopted At Any Stage Of The University Teaching And At The Same Time Be Useful To The Practising Organic Chemists.

Download or read book Research Awards Index written by and published by . This book was released on 1988 with total page 874 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Research Grants Index written by National Institutes of Health (U.S.). Division of Research Grants and published by . This book was released on 1972 with total page 918 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Recent Experimental and Computational Advances in Molecular Spectroscopy written by Rui Fausto and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 458 pages. Available in PDF, EPUB and Kindle. Book excerpt: Both molecular spectroscopy and computational chemistry have witnessed rapid significant progresses in recent years. On the one hand, it is nowadays possible to compute, to quite a reasonable degree of accuracy, almost all fundamental spectroscopic properties for small molecular systems. The theoretical approach is now properly considered to be of fundamental importance in attaining a high degree of understanding of spectroscopic information. Moreover, it may be also a great help in designing and planning experiments. On the other hand, new and very powerful experimental techniques have been developed. This book combines an advanced teaching standpoint with an emphasis on the interplay between theoretical and experimental molecular spectroscopy. It covers a wide range of topics (such as molecular dynamics and reactivity, conformational analysis, hydrogen bonding and solvent effects, spectroscopy of excited states, complex spectra interpretation and simulation, software development and biochemical applications of molecular spectroscopy) and considers a large variety of molecular spectroscopic techniques, either from an experimental or from a theoretical perspective. (short text) This book combines an advanced teaching standpoint with an emphasis on the interplay between theoretical and experimental molecular spectroscopy. It covers a wide range of topics (such as molecular dynamics and reactivity, conformational analysis, hydrogen bonding and solvent effects, spectroscopy of excited states, complex spectra interpretation and simulation, software development and biochemical applications of molecular spectroscopy) and considers a large variety of molecular spectroscopic techniques either from an experimental or from a theoretical perspective.

Download or read book Potential Energy Functions in Conformational Analysis written by Kjeld Rasmussen and published by Springer. This book was released on 1985 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt: I get by with a little help from my friends The Beatles: Sgt. Pepper This book should have been in Danish. Any decent person must be able to express himself in his mother's tongue, also when expounding scientific ideas and results. Had I stuck to this ideal, the book would have been read by very few people, and, indeed, appreciated by even fewer. Having it publƯ ished in English gives me a chance to fulfill one ambition: to be read and judged by the international scientific community. Another reason is that the majority of my professional friends are regrettably unread in Danish, just as I am in Hebrew, Finnish and even Italian. I want to deprive them of the most obvious excuse for not reading my opus. Like a man I admired, I will first of all thank my wife. In his autobiography, Meir Weisgal, then President of the Weizmann InstiƯ tute of SCience, wrote about his wife: "In addition to her natural endowments - which are considerable - she was a more than competent part-tim~ secretary." He wrote on, and so shall I. The book has been edited by my wife. So if the reader finds the layout pleasant as, in actual fact, I myself do, Birgit is to be praised. If there are blemishes, I am to be blamed for not having caught them

Download or read book Optical Activity and Chiral Discrimination written by S.F. Mason and published by Springer Science & Business Media. This book was released on 2013-03-14 with total page 375 pages. Available in PDF, EPUB and Kindle. Book excerpt: For Louis Pasteur, the two distinctive properties of dissymmetric systems, optical activity and chiral discrimination, provided prime evidence for a Divine origin to the universe. Handedness appeared to be built into the macrocosm of the galaxies, each with a non-superposable mirror image by virtue of its rotation, as well as the microcosm of each molecule of most natural products. The best that the chemist in the laboratory could accomplish appeared to be the synthesis of the detordu internally-compensated meso-form and, as Pasteur ultimately came to admit, the externally-compensated racemic form. In the latter case the chemist generated not merely one but two chiral structures, although parity, and secondary symmetry generally, seemed to be conserved in the enantiomer antipode pair. The cosmic element in the Pasteur tradition received an augmentation in secular form from demonstrations of the non conservation of parity in the weak interactions, and from the discovery of net circularity in the extra-terrestrial photons, such as those from the less-distant planets, particularly the photons from the Jupiter red-spot. The development of the photoacoustic circular analysers a decade ago was received in fact with as much enthusiasm by the astronomers as by the chemists. It would be just to add, however, that the majority of these circular analysers are now to be found, not in the observatories, but in the physical and chemistry laboratories devoted to the molecular aspects of the Pasteur tradition.

Download or read book AMolecular Description of Biological Membrane Components by Computer Aided Conformational Analysis written by Robert Brasseur and published by CRC Press. This book was released on 2019-07-18 with total page 349 pages. Available in PDF, EPUB and Kindle. Book excerpt: First published in 1990, the goal of these two volumes is to help fill the gap between theory and experiment in membrane science. Those involved with biochemistry, biophysics, pharmacology, and biology will find these volumes interesting and informative.

Download or read book Conformational Concept For Synthetic Chemist s Use Principles And In Lab Exploitation written by Belostotskii Anatoly M and published by World Scientific. This book was released on 2015-09-17 with total page 580 pages. Available in PDF, EPUB and Kindle. Book excerpt: This innovative book presents an original account of the principles of conformational theory. It has a strong focus on computational methodologies for conformational space exploration. By revisiting basic conformational conventions, considering experimental results which are often misinterpreted by organic chemists, and qualitatively analyzing the potential energy surface, the book helps non-experts to understand molecular flexibility at the level required in contemporary research.The book shows synthetic organic chemists how to perform successful conformational studies using widespread calculation packages ('click computational chemistry') instead of being misguided by textbook-based conformational analysis. The monograph actually offers to synthetic chemists a new research tool that can significantly upgrade their ability to predict, or at least explain, regioselectivity and stereoselectivity in their own reactions.

Download or read book Encyclopedia of Supramolecular Chemistry Two Volume Set Print written by Jerry L. Atwood and published by CRC Press. This book was released on 2013-10-09 with total page 1745 pages. Available in PDF, EPUB and Kindle. Book excerpt: The two-volume Encyclopedia of Supramolecular Chemistry offers authoritative, centralized information on a rapidly expanding interdisciplinary field. User-friendly and high-quality articles parse the latest supramolecular advancements and methods in the areas of chemistry, biochemistry, biology, environmental and materials science and engineering, physics, computer science, and applied mathematics. Designed for specialists and students alike, the set covers the fundamentals of supramolecular chemistry and sets the standard for relevant future research.

Download or read book Encyclopedia of Supramolecular Chemistry written by J. L. Atwood and published by CRC Press. This book was released on 2004 with total page 1002 pages. Available in PDF, EPUB and Kindle. Book excerpt: Covers the fundamentals of supramolecular chemistry; supramolecular advancements and methods in the areas of chemistry, biochemistry, biology, environmental and materials science and engineering, physics, computer science, and applied mathematics.

Download or read book Organic Conformational Analysis and Stereochemistry from Circular Dichroism Spectroscopy written by David A. Lightner and published by John Wiley & Sons. This book was released on 2000-03-31 with total page 508 pages. Available in PDF, EPUB and Kindle. Book excerpt: Unter Zirkulardichroismus (CD) versteht man die spezifisch unterschiedliche Absorption von links- und rechtszirkular polarisiertem Licht durch bestimmte Moleküle. CD-Effekte lassen sich in Abhängigkeit von der Wellenlänge messen und spektroskopisch auswerten; sie geben beispielsweise Auskunft über die Konformation organischer Verbindungen. Dieses Buch richtet sich an den organischen Chemiker, der mit den Grundprinzipien der Stereochemie vertraut ist, und erläutert die Anwendung der CD-Spektroskopie zur Konformationsanalyse ausführlich und verständlich. (06/00)

Download or read book Engineering Chemistry M T U written by B. S. CHAUHAN and published by Laxmi Publications. This book was released on 2022 with total page 465 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Handbook of High resolution Spectroscopy written by Martin Quack and published by John Wiley & Sons. This book was released on 2011-09-26 with total page 2236 pages. Available in PDF, EPUB and Kindle. Book excerpt: The field of High-Resolution Spectroscopy has been considerably extended and even redefined in some areas. Combining the knowledge of spectroscopy, laser technology, chemical computation, and experiments, Handbook of High-Resolution Spectroscopy provides a comprehensive survey of the whole field as it presents itself today, with emphasis on the recent developments. This essential handbook for advanced research students, graduate students, and researchers takes a systematic approach through the range of wavelengths and includes the latest advances in experiment and theory that will help and guide future applications. The first comprehensive survey in high-resolution molecular spectroscopy for over 15 years Brings together the knowledge of spectroscopy, laser technology, chemical computation and experiments Brings the reader up-to-date with the many advances that have been made in recent times Takes the reader through the range of wavelengths, covering all possible techniques such as Microwave Spectroscopy, Infrared Spectroscopy, Raman Spectroscopy, VIS, UV and VUV Combines theoretical, computational and experimental aspects Has numerous applications in a wide range of scientific domains Edited by two leaders in this field Provides an overview of rotational, vibration, electronic and photoelectron spectroscopy Volume 1 - Introduction: Fundamentals of Molecular Spectroscopy Volume 2 - High-Resolution Molecular Spectroscopy: Methods and Results Volume 3 - Special Methods & Applications