A Matrix Isolation, Fourier Transform Infrared Spectroscopy and Ab Initio Investigation of Photochemical Reactions of Ozone with Dimethylacetylene, Benzene, and Methylbenzenes PDF Download
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Author: James Kenneth Parker
Publisher:
ISBN:
Category :
Languages : en
Pages : 244
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Author: James Kenneth Parker
Publisher:
ISBN:
Category :
Languages : en
Pages : 244
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Author:
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 846
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Author: Bridgett Rakestraw
Publisher:
ISBN:
Category :
Languages : en
Pages : 121
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Book Description
The matrix isolation technique combined with infrared (IR) spectroscopy and theoretical calculations has been used to investigate the thermal and photochemical reactions of ozone with propene, 2,3-dimethyl-2-butene (DMB), styrene, and Z-3-methyl-2-pentene (MP). In the DMB and styrene twin jet systems, upon annealing to 35 K and 68 K (respectively) several bands were assigned to the primary ozonides, elusive Criegee intermediates, and secondary ozonides. The twin jet annealed MP system yielded assignments to the primary and secondary ozonides. For DMB, the wavelength dependence of the photo-destruction of these product bands was explored with irradiation from [lambda] = 220 to = 580 nm. A recently developed concentric jet method was also utilized to increase yields and monitor the concentration of intermediates and products formed at different times by varying the length of mixing distance (d = 0 to -11 cm) before reaching the cold cell for spectroscopic detection. For the reaction of ozone with propene, initial twin jet deposition upon annealing to 35 K yielded no visible changes in the IR spectra. Merged jet deposition led to the observation of "laterʺ, more stable products of this reaction for each alkene. Irradiation of the twin jet systems for all alkenes in this study were dominated by ozone decomposition and subsequent O atom reaction with the alkene. Identification of intermediates and products formed during the ozonolysis of these alkenes were further supported by 18O and labeling experiments as well as theoretical density functional calculations at the B3LYP/6-311G++(d,2p) level.
Author: Huongtrandiep Phan
Publisher:
ISBN:
Category :
Languages : en
Pages : 40
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Book Description
The utilization of metal oxide thin films in the microelectronics field as well as in solar energy conversion, laser production and in many other areas has grown rapidly together with the methods to produce these films. In this study, we will discuss the mechanism of the reaction of ozone with trimethylaluminum Al(CH3)3, which has been utilized for the synthesis of aluminum oxide thin films in industry. Al2O3 thin films have attracted substantial interest due to its relatively high dielectric constant, high radiation resistance and high thermal conductivity, also thermal and chemical stability on Si substrates. A detailed understanding of the mechanism of the reaction of O3 with Al(CH3)3 in gas phase can be useful for the engineers to modify the reactor design to synthesize higher quality thin films. Matrix isolation technique, combined with infrared spectroscopy, has been used in this study to isolate and characterize the reactive intermediates of this reaction. Merged jet, twin jet and concentric jet codeposition of the samples, together with 18O isotopic labeling experiments led to the isolation of formaldehyde and ethane as primary products and other initial products. Those results suggest a mechanism in which the initial step involves the formation of an excited H3CO radical by the oxidation of the Al-C bond. Twin jet codeposition led to the final spectra with extremely weak intensity of the product bands. Density functional theory calculations at the B3LYP/6-311++G(d,2p) level have been carried out to support the identification of the possible products.
Author: Nxumalo Lawrence Muziwani
Publisher:
ISBN:
Category : Molecular structure
Languages : en
Pages :
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Author: Puei-Ling Tan
Publisher:
ISBN:
Category :
Languages : en
Pages : 146
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Author: David Warren Ball
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 670
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Author: Loraine Johanna Foley
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author:
Publisher: Elsevier
ISBN: 0080538312
Category : Science
Languages : en
Pages : 677
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Book Description
The book is a multi-author survey (in 15 chapters) of the current state of knowledge and recent developments in our understanding of oxide surfaces. The author list includes most of the acknowledged world experts in this field. The material covered includes fundamental theory and experimental studies of the geometrical, vibrational and electronic structure of such surfaces, but with a special emphasis on the chemical properties and associated reactivity. The main focus is on metal oxides but coverage extends from 'simple' rocksalt materials such as MgO through to complex transition metal oxides with different valencies.
Author: David R. Lide
Publisher: CRC Press
ISBN: 9780849304859
Category : Science
Languages : en
Pages : 2900
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Book Description
Get a FREE first edition facsimile with each copy of the 85th! Researchers around the world depend upon having access to authoritative, up-to-date data. And for more than 90 years, they have relied on the CRC Handbook of Chemistry and Physics for that data. This year is no exception. New tables, extensive updates, and added sections mean the Handbook has again set a new standard for reliability, utility, and thoroughness. This edition features a Foreword by world renowned neurologist and author Oliver Sacks, a free facsimile of the 1913 first edition of the Handbook, and thumb tabs that make it easier to locate particular data. New tables in this edition include: Index of Refraction of Inorganic Crystals Upper and Lower Azeotropic Data for Binary Mixtures Critical Solution Temperatures of Polymer Solutions Density of Solvents as a Function of Temperature By popular request, several tables omitted from recent editions are back, including Coefficients of Frictionand Miscibility of Organic Solvents. Ten other sections have been substantially revised, with some, such as the Table of the Isotopes and Thermal Conductivity of Liquids, significantly expanded. The Fundamental Physical Constants section has been updated with the latest CODATA/NIST values, and the Mathematical Tables appendix now features several new sections covering topics that include orthogonal polynomials Clebsch-Gordan coefficients, and statistics.
