Synthesis and Characterization of Aromatic-substituted Titanium Oxo-carboxo Derivatives and Their Use in Organic-inorganic Hybrid Materials PDF Download
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Author: Sébastien Cochet
Publisher:
ISBN:
Category :
Languages : en
Pages : 219
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Book Description
The synthesis and characterization of aromatic substituted titanium oxo-entities as well as their utilization in hybrid materials is presented. Two main routes have been chosen for the synthesis, in respect to the structure and morphology of the obtained entities: - The first one is the reaction of titanium alkoxide with a slightly excess of carboxylic acid, which yields in well-defined titanium oxo-alkoxo clusters of formula Ti6O4(C6H5COO)8(OR)8 (with R = Et, Prn or Bun) or TixOy(CH2=CH-C6H4COO)z(OPri)z. - The second route is the reaction carried out with a large excess of carboxylic acid to remove all isopropoxide groups. Therefore well-defined oxo-carboxo cluster of formula Ti8O8(C6H5COO)16.(C6H5COOH)2.H2O, or titanium oxo-entities functionalized with amino, nitro and hydroxy groups could be obtained. Afterward the use of the former synthesized products in organic and/or inorganic-organic hybrid materials, particularly for modification of thermal and optical properties, is outlined.
Author: Sébastien Cochet
Publisher:
ISBN:
Category :
Languages : en
Pages : 219
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Book Description
The synthesis and characterization of aromatic substituted titanium oxo-entities as well as their utilization in hybrid materials is presented. Two main routes have been chosen for the synthesis, in respect to the structure and morphology of the obtained entities: - The first one is the reaction of titanium alkoxide with a slightly excess of carboxylic acid, which yields in well-defined titanium oxo-alkoxo clusters of formula Ti6O4(C6H5COO)8(OR)8 (with R = Et, Prn or Bun) or TixOy(CH2=CH-C6H4COO)z(OPri)z. - The second route is the reaction carried out with a large excess of carboxylic acid to remove all isopropoxide groups. Therefore well-defined oxo-carboxo cluster of formula Ti8O8(C6H5COO)16.(C6H5COOH)2.H2O, or titanium oxo-entities functionalized with amino, nitro and hydroxy groups could be obtained. Afterward the use of the former synthesized products in organic and/or inorganic-organic hybrid materials, particularly for modification of thermal and optical properties, is outlined.
Author: Bernadette Charleux
Publisher: John Wiley & Sons
ISBN: 1118870050
Category : Technology & Engineering
Languages : en
Pages : 548
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Book Description
This book provides readers with a one-stop entry into the chemistry of varied hybrids and applications, from a molecular synthetic standpoint • Describes introduction and effect of organic structures on specific support components (carbon-based materials, proteins, metals, and polymers). • Chapters cover hot topics including nanodiamonds, nanocrystals, metal-organic frameworks, peptide bioconjugates, and chemoselective protein modification • Describes analytical techniques, with pros and cons, to validate synthetic strategies • Edited by internationally-recognized chemists from different backgrounds (synthetic polymer chemistry, inorganic surfaces and particles, and synthetic organic chemistry) to pull together diverse perspectives and approaches
Author: Sana Ahmad
Publisher:
ISBN:
Category :
Languages : fr
Pages : 0
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Book Description
Ce mémoire rapporte la préparation et l'étude de matériaux hybrides organiques-inorganiques à base de titane où les deux réseaux sont liés par des liaisons titane-carbone stables. Différents précurseurs dans lesquels deux groupes cyclopentadienyltitane sont reliés par des espaceurs variés ont été préparés. Ces espaceurs comprennent des groupes aromatiques et hétéroaromatiques linéaires ainsi que des groupes aromatiques disubstitués par des chaînes alkyle. Ces complexes dimétalliques, où le titane est aussi lié à trois groupes labiles, ont été ensuite hydrolysés dans les conditions du procédé sol-gel pour conduire à des hybrides de classe II. Le réseau organique y est lié au réseau inorganique par des liaisons stables titane-carbone. Ces matériaux sont organisés et leur mode d'organisation dépend de la nature de l'espaceur reliant les groupes cyclopentadienyle. Les espaceurs linéaires conduisent à des matériaux à structure en escalier dans lesquels les ligands sont associés par des liaisons p. La longueur des espaceurs n'a pas d'effet sur cette organisation. Par contre, les matériaux à espaceurs substitués latéralement sont organisés par les chaînes alkyle. La calcination de ces matériaux hybrides sous oxygène conduit à la formation de dioxyde de titane nanoporeux sous forme d'anatase dont la cristallinité et la surface spécifique dépendent de la température de calcination. D'une façon similaire des films de dioxyde de titane de même type sont obtenus par la calcination de films minces d'hybrides préparés par spin-coating.
Author: John A. Belot
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
Author: Manfred T. Reetz
Publisher: Springer
ISBN:
Category : Science
Languages : en
Pages : 256
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Book Description
Titanium has been used to perform many kinds of reactions in organic and inorganic chemistry. The present book is concerned primarily with a new development in titanium chemistry which is useful in organic synthesis. In 1979/80 it was discovered that the titanation of classical carbanions using C1TiX leads to species with reduced basicity and reactivity. This increases 3 chemo-, regio-and stereo selectivity in reactions with organic compounds such as aldehydes, ketones and alkyl halides. Many new examples have been reported in recent times. Since the nature of the ligand X at titanium can be widely varied, the electronic and steric nature of the reagents is easily controlled. This helps in predicting the stereochemical outcome of many of the C-C bond forming reactions, but the trial and error method is still necessary in other cases. One of the ultimate objectives of chemistry is to understand correlations between structure and reactivity. Although this goal has not been reached in the area of organotitanium chemistry, appreciable progress has been made. A great deal of physical and computational data of organotitanium compounds described in the current and older literature (e. g. , Ziegler-Natta type catalysts) has been reported by polymer, inorganic and theoretical chemists. It is summarized in Chapter 2 of this book, because some aspects are useful in understanding reactivity and selectivity of organo titanium compounds in organic synthesis as described in the chapters which follow.
Author: Bogdan Adrian Moraru
Publisher:
ISBN:
Category :
Languages : en
Pages : 412
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Book Description
Author: R. A. Sheldon
Publisher: John Wiley & Sons
ISBN: 3527612971
Category : Science
Languages : de
Pages : 636
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Book Description
Nowadays, the chemical industry is under increased pressure to develop cleaner production processes and technologies. Much effort is devoted to the development of heterogeneous catalysts and their application in industrial-scale organic synthesis. This handbook concentrates on current attempts, focusing on fine chemical production. With contributions from an impressive array of international experts, this is essential reading for everyone interested in the advances in this field.
Author: P.A. Chaloner
Publisher: Springer Science & Business Media
ISBN: 9401717915
Category : Science
Languages : en
Pages : 293
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Book Description
Homogeneous hydrogenation is one of the most thoroughly studied fields of homogeneous catalysis. The results of these studies have proved to be most important for an understanding of the underlying principles of the activation of small molecules by transition metal complexes. During the past three decades homogeneous hydrogenation has found widespread application in organic chemistry, including the production of important pharmaceuticals, especially where a sophisticated degree of selectivity is required. This volume presents a general account of the main principles and applications of homogeneous hydrogenation by transition metal complexes. Special attention is devoted to the mechanisms by which these processes occur, and the role of the recently discovered complexes of molecular hydrogen is described. Sources of hydrogen, other than H2, are also considered (transfer hydrogenation). The latest achievements in highly stereoselective hydrogenations have made possible many new applications in organic synthesis. These applications are documented by giving details of the reduction of important unsaturated substrates (alkenes, alkynes, aldehydes and ketones, nitrocompounds, etc.). Hydrogenation in biphasic and phase transfer catalyzed systems is also described. Finally, a discussion of the biochemical routes of H2 activation highlights the similarities and differences in performing hydrogenation in both natural and synthetic systems. For researchers working in the fields of homogeneous catalysis, especially in areas such as pharmaceuticals, plastics and fine chemicals.
Author: Dirk E. Vos
Publisher: Wiley-VCH
ISBN:
Category : Medical
Languages : en
Pages : 352
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Book Description
Homogeneous asymmetric catalysis offers reliable results and the possibility to 'tune' the catalysis on a rational basis. A pitfall, however, is that the separation of the catalyst from the starting material and products is difficult and often results in the loss of the catalytic material. Immobilization offers a potential solution for the user of enantioselective catalysts in industrial processes and laboratories. Heterogeneous catalysis allows continuous operations, recycling of the catalyst, and an easy separation of the reaction products, reducing both waste and costs. Chemists in academia and industry will welcome this careful selection of topics in this handbook that provides readers with practical and detailed information about the technical requirements for the immobilization of chiral catalysts, their application in synthesis, and methods for recycling.
Author: Julian A. Davies
Publisher: Wiley-VCH
ISBN:
Category : Science
Languages : en
Pages : 592
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Book Description
A review of the principles, current research and ideas related to taking naturally occurring petroleum by-products and making them into useful products. This book aims to introduce nonspecialists to the field and provide them with current knowledge contributed by experts in inorganic, organic, catalysis chemistries and biochemistry. The focus is on homogeneous metal-based chemistry with an emphasis on mechanism and energetics. Selective Hydrocarbon Activation is a blend of theory and experiment and is of interest to both academics and those in industry.
