Preparation and characterization of cyclopentadienyltitanium-based organic-inorganic hybrid materials

Preparation and characterization of cyclopentadienyltitanium-based organic-inorganic hybrid materials PDF Author: Sana Ahmad
Publisher:
ISBN:
Category :
Languages : fr
Pages : 0

Get Book Here

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.

Preparation and characterization of cyclopentadienyltitanium-based organic-inorganic hybrid materials

Preparation and characterization of cyclopentadienyltitanium-based organic-inorganic hybrid materials PDF Author: Sana Ahmad
Publisher:
ISBN:
Category :
Languages : fr
Pages : 0

Get Book Here

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.

Synthesis and Characterization of Aromatic-substituted Titanium Oxo-carboxo Derivatives and Their Use in Organic-inorganic Hybrid Materials

Synthesis and Characterization of Aromatic-substituted Titanium Oxo-carboxo Derivatives and Their Use in Organic-inorganic Hybrid Materials PDF Author: Sébastien Cochet
Publisher:
ISBN:
Category :
Languages : en
Pages : 219

Get Book Here

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.

Synthesis and Characterization of New Organic, Inorganic, and Organometallic Tetrathiafulvalenes and CdSe Hybrid Materials

Synthesis and Characterization of New Organic, Inorganic, and Organometallic Tetrathiafulvalenes and CdSe Hybrid Materials PDF Author: John A. Belot
Publisher:
ISBN:
Category :
Languages : en
Pages : 0

Get Book Here

Book Description


Organic/Inorganic Hybrid Materials II: Volume 576

Organic/Inorganic Hybrid Materials II: Volume 576 PDF Author: Lisa C. Klein
Publisher:
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 488

Get Book Here

Book Description
The MRS Symposium Proceeding series is an internationally recognised reference suitable for researchers and practitioners.

Design and Applications of Novel Titanium and Copper Containing Mesoporous Organic-inorganic Hybrid Materials

Design and Applications of Novel Titanium and Copper Containing Mesoporous Organic-inorganic Hybrid Materials PDF Author: Ruth Ballesteros Gómez
Publisher: Librería-Editorial Dykinson
ISBN: 8499828329
Category : Science
Languages : en
Pages : 310

Get Book Here

Book Description
Different titanium-containing hybrid mesoporous materials have been successfully synthesized from cyclopentadienyl or alkoxo titanium derivatives as titanium sources. The immobilization of the titanium complex has been carried out by grafting or tethering method in order to compare the catalytic performance of each process. Furthermore, two different capped agents have been used to silylate the support surface in order to increase the hydrophobic character of the final catalyst. In chapter 6 it would be evaluated if the choice of the capped agent employed has consequences in the activity of the catalyst in determined epoxidation reactions.

Bulletin of the Korean Chemical Society

Bulletin of the Korean Chemical Society PDF Author:
Publisher:
ISBN:
Category : Chemistry
Languages : en
Pages : 684

Get Book Here

Book Description


Dissertation Abstracts International

Dissertation Abstracts International PDF Author:
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 858

Get Book Here

Book Description


Applications of Polyhedral Oligomeric Silsesquioxanes

Applications of Polyhedral Oligomeric Silsesquioxanes PDF Author: Claire Hartmann-Thompson
Publisher: Springer Science & Business Media
ISBN: 904813787X
Category : Science
Languages : en
Pages : 440

Get Book Here

Book Description
The commercial availability and decreasing cost of polyhedral oligomeric silsesquioxanes in recent years has opened up the field to everybody who wishes to apply these unique properties in their own technologies. This is the first book to provide a comprehensive overview of these applications, and covers the synthesis, characterization and history of polyhedral oligomeric silsesquioxanes, their use as metallasilsesquioxane catalysts, their effect upon polymer properties and plastics performance, and their use in superhydrophobic nanocomposites, and electronics, energy, space and biomedical applications. "Applications of Polyhedral Oligomeric Silsesquioxanes" is a valuable reference for those working across a range of disciplines, including chemists, materials scientists, polymer physicists, plastics engineers, surface scientists, and anybody with a commercial or academic interest in plastics, composite materials, space materials, dental materials, tissue engineering, drug delivery, lithography, fuel cells, batteries, lubricants, or liquid crystal, LED, sensor, photovoltaic or biomedical devices.

The Vocabulary and Concepts of Organic Chemistry

The Vocabulary and Concepts of Organic Chemistry PDF Author: Milton Orchin
Publisher: John Wiley & Sons
ISBN: 0471713732
Category : Science
Languages : en
Pages : 904

Get Book Here

Book Description
This book is a basic reference providing concise, accurate definitions of the key terms and concepts of organic chemistry. Not simply a listing of organic compounds, structures, and nomenclatures, the book is organized into topical chapters in which related terms and concepts appear in close proximity to one another, giving context to the information and helping to make fine distinctions more understandable. Areas covered include: bonding, symmetry, stereochemistry, types of organic compounds, reactions, mechansims, spectroscopy, and photochemistry.

Rhodium Catalyzed Hydroformylation

Rhodium Catalyzed Hydroformylation PDF Author: Piet W.N.M. van Leeuwen
Publisher: Springer Science & Business Media
ISBN: 9781402004216
Category : Science
Languages : en
Pages : 304

Get Book Here

Book Description
In the last decade there have been numerous advances in the area of rhodium-catalyzed hydroformylation, such as highly selective catalysts of industrial importance, new insights into mechanisms of the reaction, very selective asymmetric catalysts, in situ characterization and application to organic synthesis. The views on hydroformylation which still prevail in the current textbooks have become obsolete in several respects. Therefore, it was felt timely to collect these advances in a book. The book contains a series of chapters discussing several rhodium systems arranged according to ligand type, including asymmetric ligands, a chapter on applications in organic chemistry, a chapter on modern processes and separations, and a chapter on catalyst preparation and laboratory techniques. This book concentrates on highlights, rather than a concise review mentioning all articles in just one line. The book aims at an audience of advanced students, experts in the field, and scientists from related fields. The didactic approach also makes it useful as a guide for an advanced course.