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Download Catalytic Activation of Dioxygen by Metal Complexes by László I. Simándi PDF

By László I. Simándi

The activation of dioxygen by way of steel ions has either artificial strength and organic relevance. Dioxygen is the cleanest oxidant to be used in emission-free applied sciences to lessen toxins of our environment. The ebook supplies a survey of these catalyst structures in response to steel complexes which were came upon and studied within the final decade. They turn on molecular oxygen and impact the oxidation of varied natural compounds less than gentle stipulations. a lot of the new growth is because of a look for biomimetic catalysts that may reproduction the motion of metalloenzymes. Mechanistic points are emphasised in the course of the booklet. An introductonary bankruptcy experiences the chemistry of transition steel dioxygen complexes, that are frequently the lively intermediates within the catalytic reactions mentioned. Separate chapters are dedicated to oxidation of saturated, unsaturated and fragrant hydrocarbons, phenols, catechols, oxo-compounds, phosphorus, sulfur and nitrogen compounds.

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3. Structural studies of dioxygen complexes have been extended to include spectroscopic investigations by various techniques. The objective was to establish correlations between the structure and spectroscopic characteristics so that conclusions could be drawn even in cases when X-ray data are not available. 1. 3. 1. Electronic Spectra A unified interpretation of the electronic spectra of 1:1 and 1:2 superoxo and peroxometal complexes has been dveloped by Lever and Gray [177]. The energy levels of the HOZ radical have been used to discuss both 1: 1 and 1:2 superoxometal complexes.

It has been suggested by Wilkins [314] that the oxygenation of cobalt(II) complexes is controlled by the ligand exchange process, i. e. the replacement of coordinated water (ligand) or solvent molecule by dioxygen. The rate 2+. 6-1 constant for water substitution in Co(H2 0)6 1S 3x10 s [323]. Using this value, Fallab and Mitchell [309] estimate 5x10 4 M- 1 s- 1 for k1 from probability considerations. Steric and electronic effects may cause some variation, but they remain mostly wi thin the expected limits.

Equil ibria of dioxygen complexes Dioxygen binding may be reversible or irreversible. If binding is reversible, bound dioxygen can be removed by changing the temperature, partial pressure of 02 gas, pH, solvent, etc. Removal of 02 must result in the re-formation of the original metal complex for the process to be truly reversible. Synthetic "oxygen carriers" may in some cases survive hundreds (even thousands) of oxygenation-deoxygenation cycles. A notable example is bis(3-fluorosalicylaldehyde)ethylenediiminecobalt (I I) [261], which can survive up to 3500 cycles before about 40% of the complex loses activity.

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