Metals metal complexes

To see physically the problem of motion of wavepackets in a non-diagonal diabatic potential, we plot in figure B3.4.17 a set of two adiabatic potentials and their diabatic counterparts for a ID problem, for example, vibrations in a diatom (as in metal-metal complexes). As figure B3.4.17 shows, if a wavepacket is started away from the crossing point, it would slide towards this crossing point (where where it would... 

The activation of persulfates by various reductant viz. metals, oxidizable metals, metal complexes, salts of various oxyacid of sulfur, hydroxylamine, hydrazine, thiol, polyhydric phenols, etc. has been reported [36-38]. Bertlett and Colman [39] investigated the effect of methanol on the decomposition of persulfates and proposed the following mechanism. 

Most zeolites have an intrinsic ability to exchange cations [1], This exchange ability is a result of isomorphous substitution of a cation of trivalent (mostly Al) or lower charges for Si as a tetravalent framework cation. As a consequence of this substitution, a net negative charge develops on the framework of the zeolite, which is to be neutralized by cations present within the channels or cages that constitute the microporous part of the crystalline zeolite. These cations may be any of the metals, metal complexes or alkylammonium cations. If these cations are transition metals with redox properties they can act as active sites for oxidation reactions. 

A second major route to metal-metal complexes, related to the salt-elimination method described above, is elimination of neutral molecules with concurrent formation of metal-metal bonded complexes. Transihon metal hydrides readily undergo these dinuclear reductive elimination reactions. The oxidative addition/reductive elimination see Oxidative Addition and Reductive Elimination) reaction of molecular hydrogen is a key reachon in this area (equation 47). 

A second type of metathesis reaction involves metals multiply bonded to nonmetals (equation 68). In one sense, this corresponds to a special case of dinuclear reductive elimination of neutral molecules in which multiply bonded species are involved. This reaction can occur in both directions. Multiply bonded metal-metal complexes can be cleaved by multiply bonded main group species. 

A principal motivation in the study of dinuclear organometalhc complexes is the hope that they can accomplish catalytic reactions that are not achievable by mononuclear complexes. There are a number of cases where metal-metal complexes are catalysts precursors. The most famous is... 

S.8.4.3.3. by Reaction with a Silyl-Transitlon- or Inner-Transltlon-Metal-Metal Complex. 

The isomerisation of olefins. Ther- 26 mal and catalytic isomerisation of (326) olefins using acids, metals, metal complexes or boron compounds as catalysts... 

Reaction with Metals, Metal Complexes, Metathesis Reactions. . . 212... 

Olefins s. Ethylene derivatives a-Olefins s. Ethylene derivatives, terminal Oligonucleotides, removal of 0-prolective groups 21, 25 —, solid-phase synthesis 19, 33 suppl. 21 Orgaiiometallic compounds (s. a. under individual metals. Metal complex compounds)... 

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