Download or read book Investigations of Ionic and Neutral Species in the Gas Phase by Tandem Mass Spectrometry written by Hongwen Chen and published by . This book was released on 1992 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt: A major application of tandem mass spectrometry is the study of gas-phase ion chemistry. Gas-phase ion chemistry involving ion thermochemistry and ion dissociation characteristics, is one of the foundations of analytical chemistry.
Download or read book Gas Phase Ion Chemistry written by Michael T. Bowers and published by Academic Press. This book was released on 2013-10-22 with total page 363 pages. Available in PDF, EPUB and Kindle. Book excerpt: Gas Phase Ion Chemistry, Volume 2 covers the advances in gas phase ion chemistry. The book discusses the stabilities of positive ions from equilibrium gas-phase basicity measurements; the experimental methods used to determine molecular electron affinities, specifically photoelectron spectroscopy, photodetachment spectroscopy, charge transfer, and collisional ionization; and the gas-phase acidity scale. The text also describes the basis of the technique of chemical ionization mass spectrometry; the energetics and mechanisms of unimolecular reactions of positive ions; and the photodissociation of gas-phase ions. The applications of molecular beam techniques to the study of ion-molecule collisions; as well as the variational treatment of charge transfer reactions are also encompassed. Chemists and biochemists will find the book invaluable.
Download or read book An Investigation of the Structure of Ions in the Gas Phase by Tandem Mass Spectrometry written by Andrew Christopher Gill and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Mass Spectrometric Investigation of the Gas Phase Ion chemistry of Plasma Deposition Processes in Radio Frequency Glow Discharges written by Luis Miguel Ferreiro and published by . This book was released on 1987 with total page 412 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Chemical Ionization Mass Spectrometry Second Edition written by Alex. G. Harrison and published by CRC Press. This book was released on 1992-06-15 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt: The only comprehensive guide to CIMS applications in structural elucidation and analytical studies Chemical Ionization Mass Spectrometry, 2nd Edition, provides a comprehensive, up-to-date review of CIMS applications in structural elucidation and quantitative analytical studies. For the benefit of readers without a background in gaseous ion chemistry, a thorough review is presented in Chapter 2. Other chapters discuss such topics as reagent ion systems within the context of the thermochemistry and kinetics of the ionization process, including reactions and the type of information obtained; isotopic exchange reactions; stereochemical effects in chemical ionization; and reactive ion/molecule collisions in quadrupole cells. Chemical ionization mass spectra of 13 classes of compounds are discussed in detail to illustrate the influence of different functional groups on the spectra observed. Chemical Ionization Mass Spectrometry, 2nd Edition will be a valuable reference for anyone interested in mass spectrometry and gaseous ion chemistry in general.
Download or read book Spin States in Biochemistry and Inorganic Chemistry written by Marcel Swart and published by John Wiley & Sons. This book was released on 2015-12-14 with total page 500 pages. Available in PDF, EPUB and Kindle. Book excerpt: It has long been recognized that metal spin states play a central role in the reactivity of important biomolecules, in industrial catalysis and in spin crossover compounds. As the fields of inorganic chemistry and catalysis move towards the use of cheap, non-toxic first row transition metals, it is essential to understand the important role of spin states in influencing molecular structure, bonding and reactivity. Spin States in Biochemistry and Inorganic Chemistry provides a complete picture on the importance of spin states for reactivity in biochemistry and inorganic chemistry, presenting both theoretical and experimental perspectives. The successes and pitfalls of theoretical methods such as DFT, ligand-field theory and coupled cluster theory are discussed, and these methods are applied in studies throughout the book. Important spectroscopic techniques to determine spin states in transition metal complexes and proteins are explained, and the use of NMR for the analysis of spin densities is described. Topics covered include: DFT and ab initio wavefunction approaches to spin states Experimental techniques for determining spin states Molecular discovery in spin crossover Multiple spin state scenarios in organometallic reactivity and gas phase reactions Transition-metal complexes involving redox non-innocent ligands Polynuclear iron sulfur clusters Molecular magnetism NMR analysis of spin densities This book is a valuable reference for researchers working in bioinorganic and inorganic chemistry, computational chemistry, organometallic chemistry, catalysis, spin-crossover materials, materials science, biophysics and pharmaceutical chemistry.
Download or read book Advances in Mass Spectrometry Volume 12 written by P.G. Kistemaker and published by Elsevier. This book was released on 2012-12-02 with total page 975 pages. Available in PDF, EPUB and Kindle. Book excerpt: These proceedings, containing the texts of the invited lectures, cover all aspects of mass spectrometry including theory, fundamental studies, applications and instrumentation. Emphasis is placed on recent developments. A complete listing of the posters is included.
Download or read book Generation and Characterization of Ionic and Neutral CH 3 OBH and CH 3 BOH in the Gas Phase by Tandem Mass Spectrometry written by Helmut Schwarz and published by . This book was released on 2000 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Gas phase Ion Chemistry Investigations by Ion Mobility and Mass Spectrometry written by Zhaoyu Zheng (Chemist) and published by . This book was released on 2021 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Reaction Dynamics Involving Ions Radicals Neutral and Excited Species written by Stefano Falcinelli and published by Frontiers Media SA. This book was released on 2020-01-22 with total page 345 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Gas Phase Reactivity Studies of Organic Species Using Mass Spectrometry written by Sisi Zhang and published by . This book was released on 2012 with total page 57 pages. Available in PDF, EPUB and Kindle. Book excerpt: DNA damaged bases are one of the reasons for a variety diseases, such as carcinogenesis, aging and cell death. uracil is a nucleobase that arises from cytosine deamination. N-Deprotonated uracil functions as a leaving group during the deamination process. Theoretically, in the SN2 reaction, leaving group ability tracks with pKa of the conjugate acid in the solution phase, that is, lower pKa is associated with better leaving group ability. In the gas phase, leaving group ability is better with higher acidity of the conjugate acid. The studies we did previously showed that although 3-methyluracil is as acidic as hydrochloric acid in the gas phase, the leaving group ability of chloride is better than deprotonated 3-methyluracil. The reason we propose this is that the electron delocalization in the transition state of SN2 reaction cannot be fully recognized as in acidity. Therefore, we designed substituted aniline and amine with leaving groups with or without the ability of electron delocalization and found that substituted amine with leaving groups that did not have the ability of electron delocalization tracked better with acidity than the one with the ability of electron delocalization. The result is consistent with our proposal. We also tested the Hammond postulate with the calculation results. Another focus of interest is N-heterocyclic singlet carbenes (NHCs), which are ligands of a variety of organometallic catalysts. Presumably the ligands are more effective if they are more basic, that is, with higher proton affinity. The protonated carbenes are also an important class of ionic liquids, known as green solvents with several advantages over traditional organic solvents. Strassner et al designed a new type of ionic liquid imidazolium salt with tunable para-aryl substituent, and we measured the acidity of these tunable aryl-alkyl ionic liquids (TAAILs). The proton-bound dimers of dimethyl imidazole and PCy3 are found to exhibit interesting reactivity. In addition to producing just protonated carbenes and protonated phosphine with collision induced dissociation (CID), the proton-bound dimers generate another ion of interest with m/z 295. We designed and synthesized the di-CD3 imidazole, and proved that the dimethyl system undergoes phosphine methylation during CID process.
Download or read book Assigning Structures to Ions in Mass Spectrometry written by John L. Holmes and published by CRC Press. This book was released on 2006-12-26 with total page 468 pages. Available in PDF, EPUB and Kindle. Book excerpt: Assigning Structures to Ions in Mass Spectrometry describes the tools currently available for determining gas-phase ion structures. It surveys current experimental methods for ion production and separation as well as those designed to reveal qualitative and quantitative aspects of gas-phase ions. It also examines how and when to apply computational chemistry and theoretical calculations. Selected case studies illustrate specific challenges associated with ion structure assignment and thermochemical problems. Bringing together key results collected over the past four decades, the book contains the data for describing or identifying ions containing C alone and C with H, O, N, S, P, halogens, and small organic cations.
Download or read book Chemical Ionization Mass Spectrometry written by Alex. G. Harrison and published by Taylor & Francis. This book was released on 2018-05-11 with total page 221 pages. Available in PDF, EPUB and Kindle. Book excerpt: The only comprehensive guide to CIMS applications in structural elucidation and analytical studies Chemical Ionization Mass Spectrometry, 2nd Edition, provides a comprehensive, up-to-date review of CIMS applications in structural elucidation and quantitative analytical studies. For the benefit of readers without a background in gaseous ion chemistry, a thorough review is presented in Chapter 2. Other chapters discuss such topics as reagent ion systems within the context of the thermochemistry and kinetics of the ionization process, including reactions and the type of information obtained; isotopic exchange reactions; stereochemical effects in chemical ionization; and reactive ion/molecule collisions in quadrupole cells. Chemical ionization mass spectra of 13 classes of compounds are discussed in detail to illustrate the influence of different functional groups on the spectra observed. Chemical Ionization Mass Spectrometry, 2nd Edition will be a valuable reference for anyone interested in mass spectrometry and gaseous ion chemistry in general.
Download or read book Investigation of the Ion Formation and Unimolecular Decomposition Mechanisms for the Desorption ionization Technique Fast atom Bombardment FAB Mass Spectrometry written by Jason Craig Rouse and published by . This book was released on 1993 with total page 598 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on with total page 1050 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Interpretation of MS MS Mass Spectra of Drugs and Pesticides written by Wilfried M. A. Niessen and published by John Wiley & Sons. This book was released on 2017-01-30 with total page 421 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides comprehensive coverage of the interpretation of LC–MS–MS mass spectra of 1300 drugs and pesticides Provides a general discussion on the fragmentation of even-electron ions (protonated and deprotonated molecules) in both positive-ion and negative-ion modes This is the reference book for the interpretation of MS–MS mass spectra of small organic molecules Covers related therapeutic classes of compounds such as drugs for cardiovascular diseases, psychotropic compounds, drugs of abuse and designer drugs, antimicrobials, among many others Covers general fragmentation rule as well as specific fragmentation pathways for many chemical functional groups Gives an introduction to MS technology, mass spectral terminology, information contained in mass spectra, and to the identification strategies used for different types of unknowns
Download or read book Reactive Intermediates written by Leonardo S. Santos and published by John Wiley & Sons. This book was released on 2009-11-04 with total page 341 pages. Available in PDF, EPUB and Kindle. Book excerpt: During the last two decades there has been considerable growth in the development of electrospray ionization mass spectrometry (ESI-MS) as a practical method in the study of reaction mechanisms. This method allows the interception and characterization of key intermediates, either as transient species or as protonated/deprotonated forms of neutral species by API-MS. The outstanding features and advantages of ESI-MS make it one of the most suitable tools for the fast screening of intermediates directly from solution, providing hitherto unavailable chemical information to organic chemists. This monograph provides an overview of the mechanisms involved in ESI-MS, the historical perspectives before looking further in-depth at specific reactions and intermediates. Written by researchers in the field, this book is an unique resource for the understanding of this cutting-edge technique.
