Organometallic Chemistry and Catalysis Grenoble Sciences
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Organometallic Chemistry from the Interacting Quantum Atoms Approach
CORSO DI DOTTORATO DI RICERCA IN SCIENZE CHIMICHE CICLO XXIII TESI DI DOTTORATO DI RICERCA ORGANOMETALLIC CHEMISTRY FROM THE INTERACTING QUANTUM ATOMS APPROACH sigla del settore scientifico disciplinare CHIM03 NOME DEL TUTOR NOME DEL DOTTORANDO Prof: Angelo Sironi Davide Tiana NOME DEL COORDINATORE DEL DOTTORATO Prof. Silvia Ardizzone ANNO ACCADEMICO 2009/2010 1 2 Index Introduction ............................................................................................................................................................................ 5 The ligand field theory (LFT) .................................................................................................................................... 5 The chemistry from a real space point of view ................................................................................................. 9 Chapter 1: The quantum theory of atoms in molecules (QTAM) ............................................................... 12 Topological analysis of electron charge density ........................................................................................... 12 Analysis of the electronic charge density Laplacian ................................................................................... 16 Other properties ........................................................................................................................................................... 18 Chapter 2: The interacting quantum atoms theory (IQA) ............................................................................ -
Structure and Dynamics of Iron Pentacarbonyl † § ‡ § ∥ ⊥ # Peter Portius,*, , Michael Bühl, Michael W
This is an open access article published under an ACS AuthorChoice License, which permits copying and redistribution of the article or any adaptations for non-commercial purposes. Article Cite This: Organometallics 2019, 38, 4288−4297 pubs.acs.org/Organometallics Structure and Dynamics of Iron Pentacarbonyl † § ‡ § ∥ ⊥ # Peter Portius,*, , Michael Bühl, Michael W. George, , Friedrich-Wilhelm Grevels, , § and James J. Turner*, † Department of Chemistry, The University of Sheffield, Western Bank, Sheffield S3 7HF, United Kingdom ‡ School of Chemistry, University of St. Andrews, St. Andrews, Fife KY16 9ST, United Kingdom § School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom ∥ Department of Chemical and Environmental Engineering, University of Nottingham Ningbo China, 199 Taikang East Road, Ningbo 315100, China ⊥ Max-Planck-Institut für Bioanorganische Chemie, Stiftstraße 34-36, D-45470 Mülheim an der Ruhr, Germany *S Supporting Information ABSTRACT: The dynamics of CO ligand scrambling in Fe(CO)5 has been investigated by linear infrared spectroscopy in super- critical xenon solution. The activation barrier for the Berry pseudorotation in Fe(CO)5 was determined experimentally to be ± −1 Ea = 2.5 0.4 kcal mol by quantitative analysis of the temperature-dependent spectral line shape. This compares well −1 with the range of Ea/(kcal mol ) = 2.0 to 2.3 calculated by various DFT methods and the value of 1.6 ± 0.3 previously obtained from 2D IR measurements by Harris et al. (Science 2008, 319, 1820). ··· The involvement of Fe(CO)5 Xe interactions in the ligand scrambling process was tested computationally at the BP86-D3/ AE2 level and found to be negligible. -
(T = C/Si/Ge): the Uniqueness of Carbon Bonds in Tetrel Bonds
Preprints (www.preprints.org) | NOT PEER-REVIEWED | Posted: 13 September 2018 doi:10.20944/preprints201809.0228.v1 Inter/intramolecular Bonds in TH5+ (T = C/Si/Ge): The Uniqueness of Carbon bonds in Tetrel Bonds Sharon Priya Gnanasekar and Elangannan Arunan* Department of Inorganic and Physical Chemistry Indian Institute of Science, Bangalore. 560012 INDIA * Email: [email protected] Abstract Atoms in Molecules (AIM), Natural Bond Orbital (NBO), and normal coordinate analysis have been carried out at the global minimum structures of TH5+ (T = C/Si/Ge). All these analyses lead to a consistent structure for these three protonated TH4 molecules. The CH5+ has a structure with three short and two long C-H covalent bonds and no H-H bond. Hence, the popular characterization of protonated methane as a weakly bound CH3+ and H2 is inconsistent with these results. However, SiH5+ and GeH5+ are both indeed a complex formed between TH3+ and H2 stabilized by a tetrel bond, with the H2 being the tetrel bond acceptor. The three-center-two-electron bond (3c-2e) in CH5+ has an open structure, which can be characterized as a V-type 3c-2e bond and that found in SiH5+ and GeH5+ is a T-type 3c-2e bond. This difference could be understood based on the typical C-H, Si-H, Ge-H and H-H bond energies. Moreover, this structural difference observed in TH5+ can explain the trend in proton affinity of TH4. Carbon is selective in forming a ‘tetrel bond’ and when it does, it might be worthwhile to highlight it as a ‘carbon bond’. -
Dramatic Synergy in Copt Nanocatalysts Stabilized by ``Click
Dramatic Synergy in CoPt Nanocatalysts Stabilized by “Click” Dendrimers for Evolution of Hydrogen from Hydrolysis of Ammonia Borane Qi Wang, Fangyu Fu, Sha Yang, Marta Martinez Moro, Maria de los Angeles Ramirez, Sergio Moya, Lionel Salmon, Jaime Ruiz, Didier Astruc To cite this version: Qi Wang, Fangyu Fu, Sha Yang, Marta Martinez Moro, Maria de los Angeles Ramirez, et al.. Dramatic Synergy in CoPt Nanocatalysts Stabilized by “Click” Dendrimers for Evolution of Hydrogen from Hydrolysis of Ammonia Borane. ACS Catalysis, American Chemical Society, 2019, 9 (2), pp.1110- 1119. 10.1021/acscatal.8b04498. hal-02335325 HAL Id: hal-02335325 https://hal.archives-ouvertes.fr/hal-02335325 Submitted on 23 Nov 2020 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. ACS Catalysis This document is confidential and is proprietary to the American Chemical Society and its authors. Do not copy or disclose without written permission. If you have received this item in error, notify the sender and delete all copies. Dramatic Synergy in CoPt Nanocatalysts Stabilized by “Click” -
Applicability of Catalytic in Situ Olefin Polymerization in Wood Technology
Applicability of Catalytic in situ Olefin Polymerization in Wood Technology Dissertation with the aim of achieving a doctoral degree at the Institute of Wood Science Department of Biology & Institute of Technical and Macromolecular Chemistry Department of Chemistry Faculty of Mathematics, Informatics and Natural Sciences Universität Hamburg Submitted by Julius Gurr Hamburg 2020 1st Supervisor: Prof. Dr. Andreas Krause Universität Hamburg Fachbereich Biologie Institut für Holzwissenschaften Leuschnerstraße 91c 21031 Hamburg 2nd Supervisor: Prof. Dr. Gerrit A. Luinstra Universität Hamburg Fachbereich Chemie Institut für Technische und Makromolekulare Chemie Bundesstraße 45 20146 Hamburg Submission: 21.12.2020 Disputation: 04.05.2021 Dedicated to my family Acknowledgement The study at hand is the result of a collaboration between the Institute of Wood Sciences and the Institute of Technical and Macromolecular Chemistry, both of the University of Hamburg. First of all I would like to thank my doctoral advisor Prof. Dr. Andreas Krause for his encouragement to stay on as a doctoral student, the enormous freedom he gave me, as well as his kindness and trust. I have learned a great deal from him and it has been an invaluable experience to me. I would also like to thank my second thesis examiner Prof. Dr. Gerrit A. Luinstra for the opportunity to perform my studies at his facilities as well as for his support and scientific advice. Prof. Dr. Bodo Saake and Prof. Dr. Elizabeth Magel not only agreed to be part of my defense commission, but accompanied me during my undergrad and postgrad studies as highly dedicated and valued teachers. I would like to express my gratitude for all their effort, not only towards me but all wood science students. -
Chemical Bonding II: Molecular Shapes, Valence Bond Theory, and Molecular Orbital Theory Review Questions
Chemical Bonding II: Molecular Shapes, Valence Bond Theory, and Molecular Orbital Theory Review Questions 10.1 J The properties of molecules are directly related to their shape. The sensation of taste, immune response, the sense of smell, and many types of drug action all depend on shape-specific interactions between molecules and proteins. According to VSEPR theory, the repulsion between electron groups on interior atoms of a molecule determines the geometry of the molecule. The five basic electron geometries are (1) Linear, which has two electron groups. (2) Trigonal planar, which has three electron groups. (3) Tetrahedral, which has four electron groups. (4) Trigonal bipyramid, which has five electron groups. (5) Octahedral, which has six electron groups. An electron group is defined as a lone pair of electrons, a single bond, a multiple bond, or even a single electron. H—C—H 109.5= ijj^^jl (a) Linear geometry \ \ (b) Trigonal planar geometry I Tetrahedral geometry I Equatorial chlorine Axial chlorine "P—Cl: \ Trigonal bipyramidal geometry 1 I Octahedral geometry I 369 370 Chapter 10 Chemical Bonding II The electron geometry is the geometrical arrangement of the electron groups around the central atom. The molecular geometry is the geometrical arrangement of the atoms around the central atom. The electron geometry and the molecular geometry are the same when every electron group bonds two atoms together. The presence of unbonded lone-pair electrons gives a different molecular geometry and electron geometry. (a) Four electron groups give tetrahedral electron geometry, while three bonding groups and one lone pair give a trigonal pyramidal molecular geometry. -
Bond Distances and Bond Orders in Binuclear Metal Complexes of the First Row Transition Metals Titanium Through Zinc
Metal-Metal (MM) Bond Distances and Bond Orders in Binuclear Metal Complexes of the First Row Transition Metals Titanium Through Zinc Richard H. Duncan Lyngdoh*,a, Henry F. Schaefer III*,b and R. Bruce King*,b a Department of Chemistry, North-Eastern Hill University, Shillong 793022, India B Centre for Computational Quantum Chemistry, University of Georgia, Athens GA 30602 ABSTRACT: This survey of metal-metal (MM) bond distances in binuclear complexes of the first row 3d-block elements reviews experimental and computational research on a wide range of such systems. The metals surveyed are titanium, vanadium, chromium, manganese, iron, cobalt, nickel, copper, and zinc, representing the only comprehensive presentation of such results to date. Factors impacting MM bond lengths that are discussed here include (a) n+ the formal MM bond order, (b) size of the metal ion present in the bimetallic core (M2) , (c) the metal oxidation state, (d) effects of ligand basicity, coordination mode and number, and (e) steric effects of bulky ligands. Correlations between experimental and computational findings are examined wherever possible, often yielding good agreement for MM bond lengths. The formal bond order provides a key basis for assessing experimental and computationally derived MM bond lengths. The effects of change in the metal upon MM bond length ranges in binuclear complexes suggest trends for single, double, triple, and quadruple MM bonds which are related to the available information on metal atomic radii. It emerges that while specific factors for a limited range of complexes are found to have their expected impact in many cases, the assessment of the net effect of these factors is challenging. -
The Session Program
1 Session Name Fundamental and Applied Aspects of N2 Coordination Chemistry Professor Yoshiaki Nishibayashi Japan University of Tokyo Professor Hiroyuki Kawaguchi Japan Tokyo Institute of Technology Professor Michael Fryzuk Canada University of British Columbia Professor Jonas Peters USA California Institute of Technology Professor Sven Schneider Germany Gottingen University 2 Session Name Small Molecule Activation Assistant Professor Alexander Parent USA North Dakota State University Associate Professor Shigeyuki Masaoka Japan Institute for Molecular Science Associate Professor Tohru Wada Japan Rikkyo University Associate Professor Curtis Berlinguette Canada The University of British Columbia Professor Marc Robert France University of Paris Diderot 3 Session Name Coordination Chemistry for Energy and Environment Chief Senior researcher and Professor Qiang Xu Japan National Institute of Advanced Industrial Science and Technology (AIST) and Kobe University Professor Osamu Ishitani Japan Tokyo Institute of Technology Professor Jing Li USA Rutgers University Research Director Christian Serre France CNRS and Ecole Normale Superieure Professor Wai-yeung Wong China The Hong Kong Polytechnic University 4 Session Name Phosphorus(III) Based Ligands: Coordination Chemistry and Catalysis Professor Maravanji S. Balakrishna India Department of Chemistry Indian Institute of Technology Bombay Institute for Chemical Research, Kyoto University Professor Fumiyuki Ozawa Japan International Research Center for Elements Science Institute for Chemical Research, -
Pauling's Defence of Bent-Equivalent Bonds
Pauling’s Defence of Bent-Equivalent Bonds: A View of Evolving Explanatory Demands in Modern Chemistry Summary Linus Pauling played a key role in creating valence-bond theory, one of two competing theories of the chemical bond that appeared in the first half of the 20th century. While the chemical community preferred his theory over molecular-orbital theory for a number of years, valence-bond theory began to fall into disuse during the 1950s. This shift in the chemical community’s perception of Pauling’s theory motivated Pauling to defend the theory, and he did so in a peculiar way. Rather than publishing a defence of the full theory in leading journals of the day, Pauling published a defence of a particular model of the double bond predicted by the theory in a revised edition of his famous textbook, The Nature of the Chemical Bond. This paper explores that peculiar choice by considering both the circumstances that brought about the defence and the mathematical apparatus Pauling employed, using new discoveries from the Ava Helen and Linus Pauling Papers archive. Keywords: Linus Pauling, Chemical Bond, Double Bond, Chemistry, Valence, Resonance, Explanation, Chemical Education Contents 1. Introduction………………………………………………………….. 2 2. Using Valence Bonds and Molecular Orbitals to Explain the Double Bond………………………………………………………................. 3 3. Textbook Explanations……………………………………………… 5 4. The Origins of Bent-Equivalent Bonds ……………………..……… 7 4.1 An Early Defence …………………………………………….. 8 5. Catalysing the Mature Defence……………………………………… 9 5.1 Soviet Suppression and Pedagogical Disfavour ………………. 11 5.2 Wilson…………………………………………………………. 12 5.3 Kekulé…………………………………………………………. 14 6. Concentrating Bond Orbitals into a Defence………………………… 15 7. Conclusions………………………………………………………….. 17 Word Count: 8658 (9936 with footnotes) Pauling’s Defence of Bent-Equivalent Bonds Page 2 of 19 1. -
Chemical Applications of X-Ray Charge-Density Analysis
Chem. Rev. 2001, 101, 1583−1627 1583 Chemical Applications of X-ray Charge-Density Analysis Tibor S. Koritsanszky† Department of Chemistry, University of the Witwatersrand, WITS 2050, Johannesburg, South Africa Philip Coppens* Department of Chemistry, State University of New York at Buffalo, Buffalo, New York, 14260-3000 Received October 18, 2000 Contents VII. Physical Properties from the Experimental 1617 Density I. Charge Densities from X-ray Diffraction 1583 A. Net Atomic and Molecular Charges 1617 II. Elements of Electron Density Determination 1585 B. Solid-State Dipole and Higher Moments and 1618 A. Expressions 1585 Nonlinear Optical Properties 1. Electron Density 1585 C. Electric Field Gradient at the Nuclear 1621 2. Structure Factor and Difference Densities 1585 Positions 3. Aspherical-Atom Formalism 1586 D. Electrostatic Potential 1621 4. Electrostatic Properties from the Charge 1586 E. Quantitative Evaluation of Electrostatic 1623 Density Interactions from the X-ray Charge Density B. Experiment and Analysis 1587 VIII. Concluding Remarks 1624 1. Experimental Conditions 1587 IX. Glossary of Abbreviations 1624 2. Data Analysis 1588 X. Acknowledgments 1624 III. Chemistry from the Electron Density 1590 XI. References 1625 A. Use of the Deformation Density 1590 B. Theory of Atoms in Molecules 1591 I. Charge Densities from X-ray Diffraction 1. Topological Atom 1591 As X-ray scattering by electrons is much stronger 2. Topological Structure of Molecules 1591 than that of the nuclei, intensities of scattered X-rays 3. Topological Classification of Atomic 1591 are almost exclusively determined by the distribution Interactions of the electrons. Thus, X-ray diffraction is a priori a 4. Laplacian of the Electron Density 1592 tool for the determination of electron distribution in 5. -
Supported Dendrimer-Encapsulated Metal Clusters: Toward Heterogenizing Homogeneous Catalysts † ‡ § † † § † § Rong Ye, , , Aleksandr V
This is an open access article published under an ACS AuthorChoice License, which permits copying and redistribution of the article or any adaptations for non-commercial purposes. Article pubs.acs.org/accounts Supported Dendrimer-Encapsulated Metal Clusters: Toward Heterogenizing Homogeneous Catalysts † ‡ § † † § † § Rong Ye, , , Aleksandr V. Zhukhovitskiy, Christophe V. Deraedt, , F. Dean Toste,*, , † ‡ § and Gabor A. Somorjai*, , , † ‡ Department of Chemistry, Kavli Energy NanoScience Institute, University of California, Berkeley, Berkeley, California 94720, United States § Chemical Science Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, United States CONSPECTUS: Recyclable catalysts, especially those that display selective reactivity, are vital for the development of sustainable chemical processes. Among available catalyst platforms, heterogeneous catalysts are particularly well-disposed toward separation from the reaction mixture via filtration methods, which renders them readily recyclable. Furthermore, heterogeneous catalysts offer numer- ous handlessome without homogeneous analoguesfor performance and selectivity optimization. These handles include nano- particle size, pore profile of porous supports, surface ligands and interface with oxide supports, and flow rate through a solid catalyst bed. Despite these available handles, however, conventional heterogeneous catalysts are themselves often structurally heterogeneous compared to homogeneous catalysts, which complicates efforts to optimize and expand the scope of their reactivity and selectivity. Ongoing efforts in our laboratories are aimed to address the above challenge by heterogenizing homogeneous catalysts, which can be defined as the modification of homogeneous catalysts to render them in a separable (solid) phase from the starting materials and products. Specifically, we grow the small nanoclusters in dendrimers, a class of uniform polymers with the connectivity of fractal trees and generally radial symmetry. -
Ep 0744414 B1
Europaisches Patentamt (19) European Patent Office Office europeenpeen des brevets ^ £P 0 744 414 B1 (12) EUROPEAN PATENT SPECIFICATION (45) Date of publication and mention (51) intci.e: C08F 10/00, C08F 4/602, of the grant of the patent: C07F 5/06 14.07.1999 Bulletin 1999/28 (21) Application number: 96107520.7 (22) Date of filing: 10.05.1996 (54) Aluminoxanate compositions Aluminoxanate-Zusammensetzungen Compositions d'aluminoxanate (84) Designated Contracting States: • Wiegand, Karl E. BE DE FR GB IT NL Baton Rouge, LA 70820 (US) (30) Priority: 26.05.1995 US 452170 (74) Representative: Schwabe - Sandmair - Marx Stuntzstrasse 16 (43) Date of publication of application: 81677 Miinchen (DE) 27.11.1996 Bulletin 1996/48 (56) References cited: (73) Proprietor: ALBEMARLE CORPORATION EP-A- 0 360 492 US-A- 5 157 137 Baton Rouge, Louisiana 70801 (US) • DATABASE WPI Derwent Publications Ltd., (72) Inventors: London, GB; AN 72-441 72t XP002012495 • Sangokoya, Samuel A. "Organic aluminium cpds production..." & Baton Rouge, LA 70815 (US) JP-A-470 240 01 1 (SHOWA DENKO) • Howie, Milham S. • DATABASE WPI Derwent Publications Ltd., Baton Rouge, LA 70810 (US) London, GB; AN 72-56272t XP002012496 • Simms, Patrick G. "Organo-aluminium cpds used as Baton Rouge, LA 70817 (US) polymerization catalysts" & JP-A-47 024 011 (SHOWA DENKO) DO ^- ^> ^> Is- Note: Within nine months from the publication of the mention of the grant of the European patent, any person may give notice the Patent Office of the Notice of shall be filed in o to European opposition to European patent granted. opposition a written reasoned statement.