Photoprocesses in Transition Metal Complexes Biosystems and Other Molecules Experiment and Theory

Irradiation of the complexes (CO)5MnMn(CO)3(a-diiminc) into their visible
absorption band gives rise to homolysis of the metal-metal bond and release of
CO from the Mn(CO)3(a-diimine) moiety. Only the homolysis reaction leads to
product ...

Author: Elise Kochanski

Publisher: Springer Science & Business Media

ISBN: 9780792319368

Category: Science

Page: 449

View: 259

The main emphasis in this book is on the photoprocesses of transition metal complexes and biosystems, but not to the exclusion of other photoprocesses. The book will thus be useful to a wide range of researchers. Beginning with a basic introduction to photophysics, quantum chemistry, and the spectroscopic techniques used for the study of organometallic intermediates and biliproteins, the book goes on to discuss the photochemistry of organometallics, special attention being paid to the photochemistry of metalbonded carbonyls and polynuclear systems in supramolecular photochemistry. After moving to a discussion of large systems, the book then developes some aspects of the photophysics of biosystems, before closing with a discussion of artificial photosynthetic model systems.

Electronic and Vibronic Spectra of Transition Metal Complexes II

Characterization of Excited Electronic and Vibronic States of Platinum Metal
Compounds with Chelate Ligands by Highly Frequency-Resolved and Time-
Resolved Spectra Hartmut Yersin, Werner Humbs, Johann Strasser Institut fur ...

Author: T. Azumi

Publisher: Springer Science & Business Media

ISBN: 9783540629221

Category: Science

Page: 260

View: 270

The unique properties and applications of transition metal compounds have long fascinated both physicists and chemists. This volume presents theoretical and experimental studies for a deeper understanding of the electronic and vibronic properties of these compounds. In particular, an introduction into properties of spin sublevels of dd*, dÂ*, and ÂÂ* states is given, and a modern ligand field theory based on the Angular Overlap Model is presented. In experimental case studies it is shown how to characterize different types of electronic transitions using modern methods of laser spectroscopy. Consequences of spin-orbit coupling, zero-field splittings, spin-lattice relaxations, chromophore-matrix interactions, Herzberg-Teller/Franck-Condon activities, and localization/delocalization properties are treated.

Supported Metal Complexes

PREFACE It is now 15 years since the first patents in polymer supported metal
complex catalysts were taken out. In the early days ion-exchange resins were
used to support ionic metal complexes. Soon covalent links were developed, and
 ...

Author: F.R. Hartley

Publisher: Springer Science & Business Media

ISBN: 9400952473

Category: Science

Page: 340

View: 343

It is now IS years since the first patents in polymer supported metal complex catalysts were taken out. In the early days ion-exchange resins were used to support ionic metal complexes. Soon covalent links were developed, and after an initially slow start there was a period of explosive growth in the mid to late 1970s during which virtually every homogeneous metal complex catalyst ever reported was also studied bound to a support. Both polymers and inorganic oxides were studied as supports, although the great preponderance of workers studied polymeric supports, and of these polystyrene was by far the commonest used. This period served to show that by very careful design polymer-supported metal complex catalysts could have specific advantages over homogeneous metal complex catalysts. However the subject was a complicated one. Merely immobilising a successful metal complex catalyst to a functionalised support rarely yielded other than an inferior version of the catalyst. Amongst the many discouraging results of the 1970s, there were more than enough results that were sufficiently encouraging to demonstrate that, by careful design, supported metal complex catalysts could be prepared in which both the metal complex and the support combined together to produce an active catalyst which, due to the combination of support and complex, had advantages of activity, selectivity and specificity not found in homogeneous catalysts. Thus a new generation of catalysts was being developed.

Catalytic Activation of Dioxygen by Metal Complexes

Kinetics and mechanisms of dioxygen complex formation and decomposition
Kinetic studies have been a useful tool in elucidating the mechanism of reactions
of transition metal complexes with dioxygen , in which dioxygen complexes and /
or ...

Author: László I. Simándi

Publisher: Springer Science & Business Media

ISBN: 9780792318965

Category: Science

Page: 397

View: 130

The activation of dioxygen by metal ions has both synthetic potential and biological relevance. Dioxygen is the cleanest oxidant for use in emission-free technologies to minimize pollution of the environment. The book gives a survey of those catalyst systems based on metal complexes which have been discovered and studied in the last decade. They activate molecular oxygen and effect the oxidation of various organic compounds under mild conditions. Much of the recent progress is due to a search for biomimetic catalysts that would duplicate the action of metalloenzymes. Mechanistic aspects are emphasized throughout the book. An introductonary chapter reviews the chemistry of transition metal dioxygen complexes, which are usually the active intermediates in the catalytic reactions discussed. Separate chapters are devoted to oxidation of saturated, unsaturated and aromatic hydrocarbons, phenols, catechols, oxo-compounds, phosphorus, sulfur and nitrogen compounds.

Optical Spectra and Chemical Bonding in Transition Metal Complexes

... 145-158 DO1 10.1007/b96901 Allowed and Forbidden d-d Bands in
Octahedral Coordination Compounds: Intensity Borrowing ... and more intense
spin-allowed bands are observed for many different octahedral transition metal
complexes.

Author: Christian Anthon

Publisher: Springer Science & Business Media

ISBN: 9783540008545

Category:

Page: 310

View: 128


N4 Macrocyclic Metal Complexes

Important Factors for the Use of Non-Noble Metal In their article on activity
benchmarks and requirements for Pt, Pt alloys, and non-Pt oxygen reduction
catalysts for PEM fuel cells, Gasteiger, Kocha, Sompalli, and Wagner13 came to
the ...

Author: J.H. Zagal

Publisher: Springer Science & Business Media

ISBN: 0387284303

Category: Science

Page: 814

View: 834

In response to significant developments in sensor science and technology, this book offers insight into the various extended applications and developments of N4 macrocycle complexes in biomimetic electrocatalysis. Chapters are devoted to the chemistry, electronic and electrochemical properties of porphyrin- based polymetallated supramolecular redox catalysts and their applications in analytical and photoelectrochemical molecular devices; the use of porphyrins, phthalocyanines and related complexes as electrocatalysts for the detection of a wide variety of environmentally polluting and biologically relevant molecules; and the use of electropolymerized metalloporphyrin and metallophthalocyanine films as powerful materials for analytical tools, especially for sensing biologically relevant species.

Macromolecule Metal Complexes MMC 9

Preface - - - - - - This text is intended for scientists , engineers and other technical
personnel who seek a current assessment of the rapidly growing field of
macromolecule - metal complexes . The book is the result of technical
contributions to ...

Author: Kalle Levon

Publisher: John Wiley & Sons

ISBN: 9783527304769

Category: Science

Page: 185

View: 226

The 9th IUPAC International Symposium on Macromolecule–Metal Complexes (MMC–9) was held at the Polytechnic University in Brooklyn, NY ; August 19–23,2001. The topics addressed included: – macromolecule–metal complexes in "green Chemistry" – polyelectrolytes and polymer batteries – electronic, magnetic and optical properties of macromolecule–metal complexes – biorelated complexes – physical properties The role of metal ions, complexes and clusters inmacromolecular systems was discussed wherein the polymer systems were either natural or synthetic (organic or inorganic). Plenary and selected lectures are presented in this volume of Macromolecular Symposia. This text is intended for scientists, engineers and other technical personnel who seek a current assessment of the rapidly growing field of macromolecule–metal complexes.

Metal Complexes

The Organic Chemistry of Palladium Peter Maitlis. M Manganese, Tf-alIYIIC
complexes, 251 Metal—carbon bond strengths, 69 Metal carbonyls reactions with
allylic complexes, 231, 232 with aryl-Pd, 101 with cyclobutadiene complexes,
171, ...

Author: Peter Maitlis

Publisher: Elsevier

ISBN: 0323155324

Category: Science

Page: 336

View: 223

The Organic Chemistry of Palladium, Volume 1: Metal Complexes deals with the number of organic reactions that can be catalyzed by palladium, particularly as regards the structures bonding, and reactions of the metal complexes. The book discusses monodentate ligands which are either neutral (carbonyls, isonitriles, carbenes) or anionic (methyl, phenyl, ethynyl, hydride). The text also examines the complexes formed by 1,3-. 1,4-, and 1,5-diolefins where four carbon atoms are bound to the metal. Palladium (II) can undergo a reaction with the 1,3-dienes and results in a ?-allylic complexes where only three carbon atoms are coordinated to the metal. (The bonding situation in complexes 1,4- and 1,5-dienes, where no great interaction between the olefins are similar to that in monoolefin complexes, is straightforward), Olefins can also react with palladium chloride in protic solvents to produce ketones (or aldehydes) or organic coupling products. Some experiments conducted by Huttel et al shows that some palladium was precipitated from the reactions giving lower yields, resulting in various aldehydes and ketones as by products. The book also discusses cyclopentadienyl and benzene complexes. The text can prove beneficial for researchers, investigators and scientists whose works involve organic chemistry, analytical chemistry, physical chemistry and inorganic chemistry.

Chemistry of Zerovalent Metal Complexes

Author: Henry Wang Choi

Publisher:

ISBN:

Category: Carbon monoxide

Page: 248

View: 981


Metal Complexes Organic Chemistry

Because of this , substitutions at the carbonyl groups of a - amino acid derivatives
have featured very strongly among the investigations into the participation of
metal complexes in nucleophilic substitutions at unsaturated carbon , with ...

Author: Peter

Publisher: CUP Archive

ISBN: 9780521293310

Category: Science

Page: 308

View: 169

Good,No Highlights,No Markup,all pages are intact, Slight Shelfwear,may have the corners slightly dented, may have slight color changes/slightly damaged spine.

Proteins as possible targets for antitumor metal complexes Biophysical studies of their interactions

Metal complexes with pharmacological properties The importance of metal
compounds in medicine dates back at least to the 16th century with reports on the
therapeutic use of metals or metal containing compounds in the treatment of
cancer.

Author: Chiara Gabbiani

Publisher: Firenze University Press

ISBN: 8884539390

Category: Science

Page: 74

View: 303


Photofunctional Transition Metal Complexes

From this perspective, a considerable number of photochromic metal complexes
involving photochromic moieties and coordination compounds with unique
electronic, magnetic and optical properties have been investigated. One research
 ...

Author: Vivian W. W. Yam

Publisher: Springer

ISBN: 3540368108

Category: Science

Page: 259

View: 346

With contributions by numerous experts

Pyridine Metal Complexes Part 6A

In previous chapters, pyridine has been shown to be either an N-donor to the
metal or an acceptor of 1r-electrons donated by the metals. In both cases 0-
complexes were formed. - Additionally, a group of complexes is known in which
the ...

Author: Desmond J. Brown

Publisher: John Wiley & Sons

ISBN: 0470239727

Category: Science

Page: 2247

View: 443

The Chemistry of Heterocyclic Compounds, since its inception, has been recognized as a cornerstone of heterocyclic chemistry. Each volume attempts to discuss all aspects – properties, synthesis, reactions, physiological and industrial significance – of a specific ring system. To keep the series up-to-date, supplementary volumes covering the recent literature on each individual ring system have been published. Many ring systems (such as pyridines and oxazoles) are treated in distinct books, each consisting of separate volumes or parts dealing with different individual topics. With all authors are recognized authorities, the Chemistry of Heterocyclic Chemistry is considered worldwide as the indispensable resource for organic, bioorganic, and medicinal chemists.

Homogeneous Catalysis with Metal Complexes

Metal. Complexes. Certain catalytic processes occurring in the environment (in
the atmosphere, and especially in natural water and wastewater) are considered
in this chapter. To understand catalytic homogeneous redox reactions, which ...

Author: Gheorghe Duca

Publisher: Springer Science & Business Media

ISBN: 364224629X

Category: Science

Page: 480

View: 279

The book about homogeneous catalysis with metal complexes deals with the description of the reductive-oxidative, metal complexes in a liquid phase (in polar solvents, mainly in water, and less in nonpolar solvents). The exceptional importance of the redox processes in chemical systems, in the reactions occuring in living organisms, the environmental processes, atmosphere, water, soil, and in industrial technologies (especially in food-processing industries) is discussed. The detailed practical aspects of the established regularities are explained for solving the specific practical tasks in various fields of industrial chemistry, biochemistry, medicine, analytical chemistry and ecological chemistry. The main scope of the book is the survey and systematization of the latest advances in homogeneous catalysis with metal complexes. It gives an overview of the research results and practical experience accumulated by the author during the last decade.

Homogeneous Catalysis with Metal Complexes

In the case of catalysis with metal complexes, this problem reduces to
determining the degree of oxidation of the metal, the number of metal atoms in
the active species, and the composition of a coordination sphere of the complex
that enters ...

Author: Oleg N. Temkin

Publisher: John Wiley & Sons

ISBN: 1119966825

Category: Science

Page: 848

View: 396

Homogeneous catalysis by soluble metal complexes has gained considerable attention due to its unique applications and features such as high activity and selectivity. Catalysis of this type has demonstrated impressive achievements in synthetic organic chemistry and commercial chemical technology. Homogeneous Catalysis with Metal Complexes: Kinetic Aspects and Mechanisms presents a comprehensive summary of the results obtained over the last sixty years in the field of the kinetics and mechanisms of organic and inorganic reactions catalyzed with metal complexes. Topics covered include: Specific features of catalytic reaction kinetics in the presence of various mono- and polynuclear metal complexes and nanoclusters Multi-route mechanisms and the methods of their identification, as well as approaches to the kinetics of polyfunctional catalytic systems Principles and features of the dynamic behavior of nonlinear kinetic models The potential, achievements, and limitations of applying the kinetic approach to the identification of complex reaction mechanisms The development of a rational strategy for designing kinetic models The kinetic models and mechanisms of many homogeneous catalytic processes employed in synthetic and commercial chemistry Written for specialists in the field of kinetics and catalysis, this book is also relevant for post-graduates engaged in the study

Catalysis by Polymer Immobilized Metal Complexes

CHAPTER 5 SPECIFIC FEATURES OF CATALYSIS BY IMMOBILIZED METAL
COMPLEXES In Chapters 1-4 special attention was paid to both general features
and specific effects of immobilized catalysts having polymer character in each ...

Author: Anatoly D. Pomogailo

Publisher: CRC Press

ISBN: 9789056991302

Category: Science

Page: 424

View: 173

Deals with a new and promising field developed during the last two decades on the boundary between homogeneous and heterogeneous catalysis. This book presents general information on catalysis for a wide range of organic reactions, e.g., hydrogenation and oxidation reactions, and polymerization transformations. Special attention is paid to electro- and photochemical stimulation of catalytic processes in the presence of immobilized metal complexes. Other topics covered are the quantitative data on the comparison of catalyses by mobile and immobilized metal complexes; main factors affecting the activity of these catalytic systems and methods of optimizing their control; and specific problems of catalysis by fixed complexes (e.g., ligand exchange and electron transfer in metal polymer systems, macromolecular effects and polyfunctional catalysis).

Spectroscopic Analysis of Metal Complexes

CHAPTER - ONE 1.1.3 Coordination compounds in Biological system It has been
proved by recent research findings that many of the normal life processes in the
biological system involve coordination compound reactions. For example iron is ...

Author: Iffat Imtiaz

Publisher: Lulu.com

ISBN: 0615148328

Category: Fiction

Page: 104

View: 430

In this book, the new metal complexes of sulfamethoxazole (antibiotic) with palladium (II), iron (II), iridium (III) and tin (II) cations have been synthesized and characterized using infrared and NMR.

Reaction Mechanisms of Metal Complexes

R.G. Wilkins, Kinetics and Mechanism of Reactions of Transition Metal
Complexes (2 ed.), VCH, Weinheim 1991. J.D. Atwood, Inorganic and
Organometallic Reaction Mechanisms, Brooks/Cole, Monterey, California, 1985.
D. Katakis and G.

Author: R W Hay

Publisher: Elsevier

ISBN: 1782420630

Category: Technology & Engineering

Page: 176

View: 829

This text provides a general background as a course module in the area of inorganic reaction mechanisms, suitable for advanced undergraduate and postgraduate study and/or research. The topic has important research applications in the metallurgical industry and is of interest in the science of biochemistry, biology, organic, inorganic and bioinorganic chemistry. In addition to coverage of substitution reactions in four-, five- and six-coordinate complexes, the book contains further chapters devoted to isomerization and racemization reactions, to the general field of redox reactions, and to the reactions of coordinated ligands. It is relevant in other fields such as organic, bioinorganic and biological chemistry, providing a bridge to organic reaction mechanisms. The book also contains a chapter on the kinetic background to the subject with many illustrative examples which should prove useful to those beginning research. Provides a general background as a course module in the area of inorganic reaction mechanisms, which has important research applications in the metallurgical industry Contains further chapters devoted to isomerization and racemization reactions, to the general field of redox reactions, and to the reactions of coordinated ligands

Molecular Orbitals of Transition Metal Complexes

We shall study different types of 'ligand field', each one being characterized by
the number of ligands and by their geometrical arrangement around the metal
centre (octahedral complexes ML6, tetrahedral, or square-planar ML4, etc.).

Author: Yves Jean

Publisher: OUP Oxford

ISBN: 9780191513695

Category: Science

Page: 288

View: 480

This book starts with the most elementary ideas of molecular orbital theory and leads the reader progressively to an understanding of the electronic structure, geometry and, in some cases, reactivity of transition metal complexes. The qualitative orbital approach, based on simple notions such as symmetry, overlap and electronegativity, is the focus of the presentation and a substantial part of the book is associated with the mechanics of the assembly of molecular orbital diagrams. The first chapter recalls the basis for electron counting in transition metal complexes. The main ligand fields (octahedral, square planar, tetrahedral, etc.) are studied in the second chapter and the structure of the "d block" is used to trace the relationships between the electronic structure and the geometry of the complexes. The third chapter studies the change in analysis when the ligands have pi-type interactions with the metal. All these ideas are then used in the fourth chapter to study a series of selected applications of varying complexity (e.g. structure and reactivity). The fifth chapter deals with the "isolobal analogy" which points out the resemblance between the molecular orbitals of inorganic and organic species and provides a bridge between these two subfields of chemistry. The last chapter is devoted to a presentation of basic Group Theory with applications to some of the complexes studied in the earlier chapters.

Advances in Catalytic Activation of Dioxygen by Metal Complexes

Chemical Research Center, Institute of Chemistry, Hungarian Academy of
Sciences, H-1525 Budapest, P.O. Box 17, Hungary Abstract: The reactivity of
cobalt(II) complexes toward dioxygen has long been recognized. Synthetic
oxygen carriers ...

Author: László I. Simándi

Publisher: Springer Science & Business Media

ISBN: 0306478161

Category: Science

Page: 338

View: 490

The subject of dioxygen activation and homogeneous catalytic oxidation by metal complexes has been in the focus of attention over the last 20 years. The widespread interest is illustrated by its recurring presence among the sessions and subject areas of important international conferences on various aspects of bioinorganic and coordination chemistry as well as catalysis. The most prominent examples are ICCC, ICBIC, EUROBIC, ISHC, and of course the ADHOC series of meetings focusing on the subject itself. Similarly, the number of original and review papers devoted to various aspects of dioxygen activation are on the rise. This trend is due obviously to the relevance of catalytic oxidation to biological processes such as dioxygen transport, and the action of oxygenase and oxidase enzymes related to metabolism. The structural and functional modeling of metalloenzymes, particularly of those containing iron and copper, by means of low-molecular complexes of iron, copper, ruthenium, cobalt, manganese, etc., have provided a wealth of indirect information helping to understand how the active centers of metalloenzymes may operate. The knowledge gained from the study of metalloenzyme models is also applicable in the design of transition metal complexes as catalytsts for specific reactions. This approach has come to be known as biomimetic or bioinspired catalysis and continues to be a fruitful and expanding area of research.