Download or read book Generation and Observation of Reactive Intermediates in the Gas Phase and Condensed Media written by Matthew Jordan Nava and published by . This book was released on 2017 with total page 446 pages. Available in PDF, EPUB and Kindle. Book excerpt: A molecular beam mass spectrometer (MBMS) has been constructed and upgraded with a laser desorption system. MBMS has allowed for the detection of reactive small molecules including but not limited to P2 from P2A2 (where A = anthracene, C14H10), HCP from PPh3(HCP)A and various dialkylamino phosphinidenes from their corresponding dibenzo-7-phosphanorbornadiene precursors by mass spectrometry. In cases where the desired reactive small molecule was not detected, MBMS has provided valuable information as to the degradation processes which may be occurring and has guided molecular precursor development. Through the use of highly sensitive microwave spectroscopic techniques, it was found that H2S and N2O3 react to form the elusive molecule HSNO in the gas phase. HSNO is believed to be a crucial intermediate in biological signaling. Through isotopic labeling studies, an accurate structure of HSNO could be derived and subsequent degradation of the molecule was explored. The hexacarboxamide cryptand mBDCA-5t-H6 was used as a ligand to prepare mono- and bimetallic iron complexes of the formula [Fe2(mBDCA-5t)]2− and [Fe(mBDCA-5t-H3)]−. Both complexes were observed to react reversibly or irreversibly with CO or NO respectively to afford [(FeEO)-Fe(mBDCA-5t)]2- or [FeEO(mBDCA-5t-H3)]− where E = C or N. Treatment of [(FeNO)·Fe(mBDCA-5t)]2− with excess NO resulted in the formation of [Fe2O(mBDCA-5t)]2-, which could be independently prepared by treatment of [Fe2(mBDCA-5t)]2− with the O-atom transfer reagent N-methylmorpholine N-oxide. The chemistry of peroxide dianion, in the form of the encapsulated complex [O2[subset]mBDCA- 5t-H6]2-, has been explored in nonaqueous media. In particular, [O2[subset]mBDCA-5t-H6]2- was demonstrated to react with CO gas at 40 °C over the course of several hours to furnish the encapsulated carbonate cryptate, [CO3[subset]mBDCA-5t-H6]2-. Through labeling studies, it was confirmed that the carbon of the carbonate was derived from CO. Treatment of [O2[subset]mBDCA-5t-H6]2- with CO2 also affords [CO3[subset]mBDCA-5t-H6]2-, but with concomitant oxidation of the solvent. The oxidation of the solvent was found to proceed through the reactive oxidants −O2COOCO2- and HOOCO2- and sheds light on oxidative processes which may be occurring in lithium-air cells. Exposure of solid Li2O2 to gaseous p-benzoquinone results in the formation of a blue coating on Li2O2. This coating was identified as the quinone radical anion Li[p-C6H4O2], which forms via lithium and electron transfer from Li2O2. This charge and ion transfer process results in the conversion of Li2O2 to LiO2, a long-sought intermediate in the lithium-air community.
Download or read book Reactive Intermediates in the Gas Phase written by D. W. Setser and published by Elsevier. This book was released on 2013-10-22 with total page 369 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reactive Intermediates in the Gas Phase: Generation and Monitoring covers methods for reactive intermediates in the gas phase. The book discusses the generation and measurement of atom and radical concentrations in flow systems; the high temperature flow tubes, generation and measurement of refractory species; and the electronically excited long-lived states of atoms and diatomic molecules in flow systems. The text also describes the production and detection of reactive species with lasers in static systems; the production of small positive ions in a mass spectrometer; and the discharge-excited rare gas halide lasers. Chemists, physicists, and people working in aerochem laboratories will find the book invaluable.
Download or read book Reviews of Reactive Intermediate Chemistry written by Matthew S. Platz and published by John Wiley & Sons. This book was released on 2007-04-20 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt: The chemistry of reactive intermediates is central to a modern mechanistic and quantitative understanding of organic chemistry. Moreover, it underlies a significant portion of modern synthetic chemistry and is integral to a molecular view of biological chemistry. Reviews in Reactive Intermediate Chemistry presents an up-to-date, authoritative guide to this fundamental topic. Although it follows Reactive Intermediate Chemistry by the same authors, it serves as a free-standing resource for the entire chemical and biochemical community. The book includes: Relevant, practical applications Coverage of such topics as mass spectrometry methods, reactive intermediates in interstellar medium, quantum mechanical tunnelling, solvent effects, reactive intermediates in biochemical processes, and excited state surfaces Discussions of emerging areas, particularly those involving dynamics and theories Concluding sections identifying key directions for future research are provided at the end of each chapter
Download or read book Reactive Intermediates in the Gas Phase written by D. W. Setser and published by . This book was released on 1979 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Canadian Journal of Chemistry written by and published by . This book was released on 1999 with total page 848 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Energy Research Abstracts written by and published by . This book was released on 1977 with total page 1162 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Russian Chemical Reviews written by and published by . This book was released on 2006 with total page 604 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1970 with total page 1054 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
Download or read book Ambient Ionization Mass Spectrometry written by Marek Domin and published by Royal Society of Chemistry. This book was released on 2014-11-25 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ambient ionization has emerged as one of the hottest and fastest growing topics in mass spectrometry enabling sample analysis with minimal sample preparation. Introducing the subject and explaining the basic concepts and terminology, this book will provide a comprehensive, unique treatise devoted to the subject. Written by acknowledged experts, there are full descriptions on how new ionization techniques work, with an overview of their strengths, weaknesses and applications. This title will bring the reader right up to date, with both applications and theory, and will be suitable as a tutorial text for those starting in the field from a variety of disciplines.
Download or read book Chemical Abstracts written by and published by . This book was released on 2002 with total page 2720 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Reactions of Inorganic Nitrogen Species in Supercritical Water written by Philip C. Dell'Orco and published by . This book was released on 1994 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Role of Air Sea Exchange in Geochemical Cycling written by Patrick Buat-Ménard and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 555 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book arises from a NATO-sponsored Advanced Study Institute on 'The Role of Air-Sea Exchange in Geochemical Cycling' held at Bombann@§. near Bordeaux, France. from 16 to 27 September 1985. The chapters of the book are the written versions of the lectures given at the Institute. The aim of the book is to give a comprehensive up-to-date coverage of the subject. presented in a teaching mode. The chapters contain much recent research material and attempt to give the reader an understanding of how the role of air-sea exchange in geochemical cycling can be quantitatively assessed. In the last decade, major advances in the fields of marine and atmospheric chemistry have underlined the role of physical, chemical and biological processes at and near the air-sea interface in a number of geochemical cycles (C. S, N, metals etc ... ). Further, there is strong concern over the anthropogenic perturbation of these cycles on both regional and global scales. The first part of the book (Chapters 1 to 8) provides a review of topics fundamental to such studies. These topics include concepts in geochemical modelling, assessment of atmospheric transport from sources to the oceans. description of mixing and transport processes within the ocean for both dissolved and particulate materials, quantification of air-sea fluxes for both gases and particles, photochemical transformations in the atmospheric and oceanic boundary layers.
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2002 with total page 972 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Publications of the National Institute of Standards and Technology Catalog written by National Institute of Standards and Technology (U.S.) and published by . This book was released on 1994 with total page 1162 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bibliography of Mass Spectroscopy Literature for 1972 Compiled by a Computer Method written by and published by . This book was released on 1975 with total page 522 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report covers the year 1972, and lists approximately 10,000 articles of interest to mass spectroscopists. This two-volume report consists of three sections. Vol. II contains the Key Word Out of Context Index (KWOC Index) section. The KWOC Index lists the key words, the reference numbers of the articles in which the key word appears, and the first 100 characters of the title.
Download or read book Physics Briefs written by and published by . This book was released on 1992 with total page 1332 pages. Available in PDF, EPUB and Kindle. Book excerpt:
