Charge metal complex

All negatively charged metal complexes can be extracted by liquid anion exchangers, independent of the nature of the metal and the complexing ligand. Liquid anion exchange has extensive industrial application, and many examples are given in later chapters. Lists of extraction values are found in other works [e.g., 5, 21]. 

When z - n = p is negative, a negatively charged metal complex has been formed, which can be extracted... 

Figure 4-3. Addition of a nucleophile may lead to the formation of stable species with an increased co-ordination number. This may involve neutral acceptors or charged metal complexes.

Models for the static spectral sensitization of coordination compounds are discussed. Among them, ion pairs with oppositely charged metal complexes, where intervalence charge-transfer interactions occur, appear to be promising exarrples. The spectra and the electron transfer kinetics,of mixed-valence ion pairs of ihe type M /fMCNjgJ4-, where M + = Fe3 Cu2 UO V02 are discussed in detail. 

Other extractants, especially tertiary amines, have been tested for some steps in reprocessing. The amines form organic soluble complexes with negatively charged metal complexes (used in uranium purification, 5.5.3). The use in the basic Purex cycle of a secondary extractive reag t can improve the decontamination factor ... 

A variety of thermochemical data were obtained for negatively charged metal complexes. For example, appearance energy measurements photodissociation, energy-resolved, collision-induced dissociation, electron-, proton- and anion-transfer reactions to and from negatively charged ions, were all used for obtaining a variety of thermochemical parameters for ions, molecules, and radicals. 

It is assumed that the surface charges are balanced by an equal number of charged metal complexes in a region adjacent to the solid surface. In this mechanism, it is also assumed that only the metal ions can be adsorbed onto the solid support. An excellent model of this type is the revised physical adsorption (RPA) model developed by Regalbuto s group [20,22, 23]. It has been experimentally verified for several metal/support systems. 

Examples include multiply charged metal complexes in SDS mi-... 

Fe(CN)g] in anion-exchange polymers, typically in Tosflex [12, 18]. To the same purpose, several examples are also reported involving Nafion for the anchoring of positively charged metal complexes [19] or of organic species [20]. 

Oyama N, Anson FC. Catalysis of electrode processes by multiply-charged metal complexes electrostatically hound to polyelectrolyte coatings on graphite electrodes, and the use of poljuner-coated rotating disk electrodes in diagnosing kinetic and conduction mechanisms. Anal Chem 1980 52 1192-8. 

Pt(terpy)X] [27]. The ability of charged metal complexes to block membrane sites and to act as neurotoxins is also consistent with the findings of Hoeschele et al who demonstrated high brain uptake of [Pt(NH3)4]2+ (Chapter 3) [28]. 

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