ion step. The reactivity of pMMO has been also explored by Chan,525 by means of DFT calculations on small models of Figure 116. Nonradical mechanism proposed in the Yoshizawa model of sMMO. Figure 117. Mononuclear and dinuclear models of the copper active sites of pMMO. CsH Bond Activation in Transition Metal Species Chemical Reviews, 2010, Vol. 110, No. 2 813

C-H bond activation in transition metal species from a computational perspective

Understanding the reactivity of transition metal complexes involving multiple spin states

Photochemical reactivity associated with metal–hydrogen bonds is widespread among metal hydride complexes and has played a critical part in opening up C–H bond activation. It has been exploited to design different types of photocatalytic reactions and to obtain NMR spectra of dilute solutions with a single pulse of an NMR spectrometer. Because photolysis can be performed on fast time scales and at low temperature, metal-hydride photochemistry has enabled determination of the molecular structure and rates of reaction of highly reactive intermediates. We identify five characteristic photoprocesses of metal monohydride complexes associated with the M–H bond, of which the most widespread are M–H homolysis and R–H reductive elimination. For metal dihydride complexes, the dominant photoprocess is reductive elimination of H2. Dihydrogen complexes typically lose H2 photochemically. The majority of photochemical reactions are likely to be dissociative, but hydride complexes may be designed with equilibrated excite...

Photochemistry of transition metal hydrides

The present review summarizes recent developments in the design of selected cyclopentadienyl ligands that contain at least two sterically demanding substituents at the ring periphery and the use of these ligands in organotransition metal chemistry. General features concerning ligand synthesis, complexation reactions, structure, and reactivity of the complexes as well as their application are reviewed. Special emphasis is put on the description of unusual interligand interactions, conformational analysis, and the use as stoichiometric reagents and catalyst precursors in transition metal-mediated transformation of organic molecules.

Transition metal complexes of sterically demanding cyclopentadienyl ligands

Publisher Summary This chapter discusses the role of matrix isolation in characterizing transition-metal fragments and then considers what conventional flash photolysis with uv-vis detection has revealed about the reactivity of these fragments. It is the timescale of these reactions that dictates the speed of the infrared (IR) spectroscopy required to detect the intermediates. The principles of these new IR techniques are explained and the apparatus involved is described. The chapter presents a self-contained summary of the organometallic chemistry that has already been unraveled by time-resolved IR spectroscopy. The basic principles of matrix isolation are relatively well known, and its application to organometallic chemistry has been recently reviewed. Many of the species generated in low-temperature matrices are coordinatively saturated species. Unlike the unsaturated transition-metal fragments, these species may have significant activation barriers for reaction or decomposition and can be stabilized by merely lowering the temperature. IR kinetic spectroscopy involves uv flash generation of transients and monitoring of transients at a finite number of IR wavelengths. There have been three primary motives behind the study of metal–carbonyl photochemistry in the gas phase: to discover the shapes of metal–carbonyl fragments in the absence of perturbing solvents or matrices, to probe the effect of uv photolysis wavelength on product distribution, and to measure the reaction kinetics of carbonyl fragments.

Detection of Transient Organometallic Species by Fast Time-Resolved IR Spectroscopy

Analyse de la structure electronique du molybdenocene et du tungstenocene par dichroisme circulaire magnetique; etude des effets de couplage spin-orbite et de distorsions Jahn-Teller sur l'etat 3 E 2g et la reactivite des metallocenes d 4

Electronic structure of molybdenocene and tungstenocene: detection of paramagnetism by magnetic circular dichroism in argon matrixes

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Electronic structure of molybdenocene and tungstenocene: detection of paramagnetism by magnetic circular dichroism in argon matrixes