Download or read book Synthesis Characterization and Computational Studies of Boron Oxygen Compounds written by Charlotte louise Jones and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis Characterization and Computational Studies of Boron oxygen Compounds written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Boron and Oxygen written by Gert Heller and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 313 pages. Available in PDF, EPUB and Kindle. Book excerpt: The present issue, Volume 2 of "Boron Compounds" 4th Supplement of the Gmelin Hand book, updates the previous issues by reporting the literature on boron-oxygen systems published up to 1988. For some important recent developments literature is covered through mid-1992; this concerns, for example, the compounds ~-Ba3[B306h and U[B305J which became of interest as materials with nonlinear optical properties. The volume directly com plements the earlier "Boron Compounds" 3rd Supplement Volume 2. In the original literature, alternative formulations are frequently used for the same com pound. This is especially true for many borates. Often, these species are neither completely heteropolar nor covalent, and an experimentally based decision has not been made. Hence, the use of brackets does not necessarily reflect a truly salt-like character. Volume 1 (systems with hydrogen and noble gases) of this particular supplement will be published subsequently, whereas Volume 3a (boron and nitrogen), Volume 3b (boron and nitrogen, boron and fluorine), and Volume 4 (boron compounds containing Cl, Br, I, S, Se, and Te, as well as a section containing carboranes) have already been published. All volumes of the 4th supplement will be augmented by a formula index. The IUPAC nomenclature is generally adhered to; thf means tetrahydrofuran; and occa sionally additional abbreviations for compounds are explained in the text. Positive signs for chemical shifts of the NMR signals indicates downfield shifts from the references, usually internal (CH3)4Si for olH and 013C with others being specified.
Download or read book Organic Chemistry of Boron written by William Gerrard and published by . This book was released on 2013-03 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Boron Compounds as Additives to Lubricants written by Faiz Ullah Shah and published by . This book was released on 2009 with total page 61 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Chemistry of Boron and Its Compounds written by Earl L. Muetterties and published by . This book was released on 1967 with total page 744 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis Characterization and Reactivity of Novel Intramolecularly Base Stabilized Boron Compounds written by Harbi al- Masri and published by . This book was released on 2003 with total page 346 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis Characterization and Reactivity of Volatile Compounds for Materials Applications written by Brian J. Bellott and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Elemental boron is a highly attractive fuel for propellants and explosives, but in order to increase the rate of energy release during the combustion of boron and make it a more attractive fuel for propellants and explosives, it is advantageous to prepare it in a nanoparticlulate form. Boron nanoparticles were prepared by gas phase pyrolysis of decaborane. The particles are >97 % boron and free of hydrogen as judged by combustion analysis. Typical recovered yields are 40 %. In order to incorporate nanoparticles into larger assemblies and to stabilize them for long term storage under ambient conditions, it is desirable to functionalize their surfaces. Treatment of the boron nanoparticles with a ~6 mol percent benzene solution of XeF2 (a convenient fluorinating agent), yields boron particles whose surfaces are fluoride terminated. Thermogravimetric analyses (TGA) conducted in pure oxygen show that surface fluorination of the boron nanoparticle causes an increase in the onset temperature of oxidation and increases the overall yield of oxidation products. High energy nanomaterials such as nanothermites and Al nanoparticles have been a topic of increasing research for applications as propellants and explosives. It is well known that a strong correlation often exists between the energy density of a nanomaterial and its sensitivity; a related issue is that nanoparticles are strongly driven to agglomerate and densify, owing to their relatively high surface free energies. One approach to addressing these problems is to passivate the nanomaterials by functionalizing their surfaces. In 2005, Higa and co-workers claimed that treatment of aluminum particles with solutions of transition metal acetylacetonate (acac) complexes resulted in the deposition of a uniform coat of the zerovalent transition metal that stabilized the nanoparticle toward oxidation. We find that treatment of aluminum nanoparticles with transition metal acac complexes yields aluminum particles decorated with discrete transition metal nanocrystals and does not result in a core-shell structure. Powder X-ray diffraction and scanning transmission electron microscopy (STEM) analysis of the particles reveals the nanocrystals vary in size depending on the transition metal. For platinum a narrow size distribution of small nanocrystals (1-3 nm) decorate the surface of the aluminum particles whereas for gold a broad size distribution of nanocrystals (2-70 nm) decorate the surface. In order to explore the preparation of new types of copper alkene complexes for CVD and ALD applications, we have investigated the structures and metal-alkene binding studies of copper(I) triflate of three chelating tri-alkenes: the cis,cis,trans (cct), cis,trans,trans (ctt), and trans,trans,trans (ttt) isomers of 1,5,9-cyclododecatriene (cdt). The X-ray crystal structures show that, in all three compounds, the triflate ligand and all three C=C double bonds of the triene are bound to the copper center, which adopts a distorted tetrahedral coordination geometry. Competitive binding studies in toluene show that free energy of the copper ctt complex is lowest, and that the free energies of the ttt and cct isomers are higher by 0.3 and 3.7 ± 0.1 kcal mol-1, respectively. For the ttt and cct isomers, binding to the metal is attended by conformational changes that increase the conformational energy of the ring; this increase is a penalty that destabilizes the resulting copper complexes relative to that of the ctt isomer.
Download or read book Synthesis and Characterization of 4 aryl Substituted Silicon nitrogen boron and Silicon nitrogen Systems written by Kyralyssa Elayne Hauger and published by . This book was released on 2016 with total page 177 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Neilson group has developed a broad spectrum of derivative chemistry originating from the study of boron compounds containing silicon-nitrogen functional groups. Some of our current research interests have focused on investigating compounds containing Si-N moieties attached to a 4-substituted aryl (Ar) functionality to afford silylanilino derivatives. Due to the variety of reactions that can occur at the boron center, combined with the reactivity of the Si-N bond, some of these compounds have the potential to be precursors to new cyclic and/or polymeric systems, for example poly(phenylene-borazenes), i.e. new inorganic-organic hybrid polymers in which the borazene ( -BR-NR'- ) and arylene ( -C6H4- ) units alternate along the backbone. The work to be presented focuses on the synthesis, characterization and reactivity of some representative examples of 4-aryl substituted (silylanilino)boranes. To be discussed are two classes of title compounds of type I, (silylanilino)boranes with the Ar-N-B backbone, and type II, (silylanilino)boranes with the B-Ar-N backbone. With.
Download or read book Synthesis and Characterization of New Binuclear Boron Compounds with Bridging Guanidinate Ligands written by Oxana Ciobanu and published by . This book was released on 2009 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis and Characterization of New Boron Nitrogen and Boron Nitrogen Phosphorus Systems written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The preparative and derivative chemistry of organoborane compounds that contain silicon-nitrogen functional groups is both diverse and synthetically useful. The wide variety of reactions that can occur at boron, in combination with facile cleavage of the Si-N bond, makes them potential precursors to polymeric B-N systems. We report here on the synthesis, characterization, and reactivity of three representative examples of the title systems of general types 1 and 2. Some of these systems are being studied as the precursors to new types of inorganic-organic hybrid polymers and/or novel ring systems.
Download or read book Synthesis Characterization Reactivity and Computational Studies of Heteroatom Boranes written by Alexandra M. Shedlow and published by . This book was released on 1999 with total page 381 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis Characterization and Oxidation of Boron doped Carbons written by William Cermignani and published by . This book was released on 1997 with total page 524 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nuclear Magnetic Resonance Spectroscopy of Boron Compounds written by Heinrich Nöth and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 474 pages. Available in PDF, EPUB and Kindle. Book excerpt: The revolutionary impetus of the NMR methods in organic chemistry has parallels in the field of boron chemistry. lIB NMR spectroscopy provided a basis for the elucida tion of structures and reactions of the boron hydrides. However, although many studies have been carried out with the higher boranes, carboranes, metalloboranes, etc. , and although certain patterns have emerged, the correlation between the observed chemical shift and the assigned structural unit is still not fully understood. Therefore, predictions in this area are still rather limited, and semiquantitative interpretations are not yet pos sible. Several years ago Eaton and Lipscomb sUpImarized the status in this field in their book "NMR Studies of Boron Hydrides and Related Compounds" and a plethora of new data has accumulated since then. The book also contained material on simple bo rane derivatives, but they were not discussed in any detail. On the other hand many systematic studies, both synthetic and spectroscopic, have been conducted on these simple boron materials in the last decade. Thus a large amount of NMR information is available, not only on lIB but also on 1 H, 1 3 C, and 14 N. However, this information is widely scattered in the literature, and often the data are not discussed at all. It see med appropriate, therefore, to collect these data and to present them in one volume.
Download or read book Boron Based Compounds written by Evamarie Hey-Hawkins and published by John Wiley & Sons. This book was released on 2018-07-23 with total page 490 pages. Available in PDF, EPUB and Kindle. Book excerpt: Noted experts review the current status of boron-containing drugs and materials for molecular medical diagnostics Boron-Based Compounds offers a summary of the present status and promotes the further development of new boron-containing drugs and advanced materials, mostly boron clusters, for molecular medical diagnostics. The knowledge accumulated during the past decades on the chemistry and biology of bioorganic and organometallic boron compounds laid the foundation for the emergence of a new area of study and application of boron compounds as lipophilic pharmacophores and modulators of biologically active molecules.This important text brings together in one comprehensive volume contributions from renowned experts in the field of medicinal chemistry of boron compounds. The authors cover a range of the most relevant topics including boron compounds as modulators of the bioactivity of biomolecules, boron clusters as pharmacophores or for drug delivery, boron compounds for boron neutron capture therapy (BNCT) and for diagnostics, as well as in silico molecular modeling of boron- and carborane-containing compounds in drug design. Authoritative and accessible, Boron-Based Compounds: Contains contributions from a panel of internationally renowned experts in the field Offers a concise summary of the current status of boron-containing drugs and materials used for molecular diagnostics Highlights the range and capacity of boron-based compounds in medical applications Includes information on boron neutron capture therapy and diagnostics Designed for academic and industrial scientists, this important resource offers the cutting-edge information needed to understand the current state of boron-containing drugs and materials for molecular medical diagnostics.
Download or read book Science of Synthesis Advances in Organoboron Chemistry towards Organic Synthesis written by E. Fernández and published by Thieme. This book was released on 2020-05-22 with total page 582 pages. Available in PDF, EPUB and Kindle. Book excerpt: The widespread use of organoboron compounds justifies the efforts devoted to their synthesis, as well as toward developing an understanding of their reactivity. The nature of the mono- or diboron species is of paramount importance in determining the reversible covalent binding properties of the boron atom with both nucleophiles and electrophiles. By wedding the rich chemical potential of organoboron compounds to the ubiquity of organic scaffolds, advanced borylation reactions have the potential to open unprecedented synthetic alternatives, and new knowledge in the field should encourage chemists to use organoboron compounds. In this volume, the main objective is to provide a collection of the most useful, practical, and reliable methods, reported mainly within the last decade, for boron activation and boron reactivity. The volume covers the main concepts of organoboron compounds and includes experimental procedures, enabling newcomers to the field the instant and reliable application of the new tools in synthesis. Rather than aiming for a comprehensive coverage, the most advanced solutions for challenging transformations are introduced. To this end, a team of pioneers and leaders in the field have been assembled who discuss both the practical and conceptual aspects of this rapidly growing field.
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt:
