Transition Metal

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P. Modrak - One of the best experts on this subject based on the ideXlab platform.

Ullrich Jahn - One of the best experts on this subject based on the ideXlab platform.

  • Radicals in Transition Metal Catalyzed Reactions? Transition Metal Catalyzed Radical Reactions? – A Fruitful Interplay Anyway
    Topics in current chemistry, 2011
    Co-Authors: Ullrich Jahn

    This review summarizes the current status of radical-based Transition Metal catalyzed reactions in organic chemistry. The underlying features of radical generation from Transition Metal complexes and radical reactivity in the framework of Transition Metal catalysis are discussed. The available arsenal to detect radicals in Transition Metal catalyzed transformations is presented. Available strategies to combine radical intermediates with Transition Metal catalysis are outlined. In the main part the currently known synthetic methodology of Transition Metal catalyzed reactions proceeding via radical intermediates is discussed. This part covers catalytic radical reactions involving group 4 to group 7 elements.

Clark R. Landis - One of the best experts on this subject based on the ideXlab platform.

  • Structure and Electron Counting in Ternary Transition Metal Hydrides
    Journal of the American Chemical Society, 1998
    Co-Authors: Timothy K. Firman, Clark R. Landis

    A large number of ternary hydrides of Transition Metals and alkali or alkaline earth Metals have been synthesized and structurally characterized in the last twenty years. These compounds exhibit a puzzling variety of compositions, Transition Metal coordination numbers, Transition Metal coordination geometries, and distribution of hydrides within and outside of the Transition Metal coordination sphere. Valence Bond (VB) concepts form a theoretical framework for understanding, at least partially, some of the dominant trends observed among various Transition Metal hydride structures. Extrapolation of these concepts suggests that synthesis of ternary Metal hydrides with formal electron counts at the Transition Metal exceeding 18 electrons may be feasible.

Alexander I. Boldyrev - One of the best experts on this subject based on the ideXlab platform.

  • All-Transition Metal Aromaticity and Antiaromaticity
    Structure and Bonding, 2010
    Co-Authors: Alina P. Sergeeva, Boris B. Averkiev, Alexander I. Boldyrev

    Though aromaticity in compounds containing a Transition-Metal atom has already been discussed for quite a long time, aromaticity in all-Transition Metal systems have been recognized only recently. There are examples of σ-, π-, and δ-aromaticity based on s-, p-, and d-AOs. We derived the counting rules for σ −, π-, δ-, and ϕ-aromaticity/antiaromaticity for both singlet/triplet coupled model triatomic and tetratomic systems so that one could use those to rationalize aromaticity and antiaromaticity in all-Transition Metal systems. These rules can be easily extended for any cyclic systems composed out of odd or even number of atoms. We elucidated the application of these rules to the all-Transition Metal cyclic systems: Au3 +/Au3 −, Na2Zn3, Hg4 6 −, Mo3O9 2 −, Sc3 −, Hf3, and Ta3 − clusters. We believe that the use of concepts of aromaticity, antiaromaticity and conflicting aromaticity can be an important theoretical tool for deciphering chemical bonding in various known and novel chemical compounds containing Transition Metal atoms.

  • Aromaticity and antiaromaticity in Transition-Metal systems.
    Physical chemistry chemical physics : PCCP, 2007
    Co-Authors: Dmitry Yu. Zubarev, Boris B. Averkiev, Hua-jin Zhai, Lai-sheng Wang, Alexander I. Boldyrev

    Aromaticity is an important concept in chemistry primarily for organic compounds, but it has been extended to compounds containing Transition-Metal atoms. Recent findings of aromaticity and antiaromaticity in all-Metal clusters have stimulated further research in describing the chemical bonding, structures and stability in Transition-Metal clusters and compounds on the basis of aromaticity and antiaromaticity, which are reviewed here. The presence of d-orbitals endows much more diverse chemistry, structure and chemical bonding to Transition-Metal clusters and compounds. One interesting feature is the existence of a new type of aromaticity—δ-aromaticity, in addition to σ- and π-aromaticity which are the only possible types for main-group compounds. Another striking characteristic in the chemical bonding of Transition-Metal systems is the multi-fold nature of aromaticity, antiaromaticity or even conflicting aromaticity. Separate sets of counting rules have been proposed for cyclic Transition-Metal systems to account for the three types of σ-, π- and δ-aromaticity/antiaromaticity. The diverse Transition-Metal clusters and compounds reviewed here indicate that multiple aromaticity and antiaromaticity may be much more common in chemistry than one would anticipate. It is hoped that the current review will stimulate interest in further understanding the structure and bonding, on the basis of aromaticity and antiaromaticity, of other known or unknown Transition-Metal systems, such as the active sites of enzymes or other biomolecules which contain Transition-Metal atoms and clusters.

Paul O'brien - One of the best experts on this subject based on the ideXlab platform.

  • Synthesis, Properties, and Applications of Transition Metal-Doped Layered Transition Metal Dichalcogenides
    Chemistry of Materials, 2016
    Co-Authors: Aleksander A. Tedstone, David J. Lewis, Paul O'brien

    Research into layered Transition Metal dichalcogenides (TMDCs), most notably those of molybdenum and tungsten disulfides, has become extensive, involving fields as diverse as optoelectronics, spintronics, energy storage, lubrication, and catalysis. The modification of TMDCs by Transition Metal doping can improve their performance in such applications and hence extend their potential for technological applications. This review concerns the synthetic strategies that have been used to incorporate Transition Metals into TMDCs and the applications of the resultant materials and relevant computational studies on the predicted properties of the doped materials.