Coordination compounds agents

The most common oxidation states and corresponding electronic configurations of platiaum are +2 which is square planar, and +4 which is octahedral. Compounds in oxidation states between 0 and +6 [t) exist. Platiaum hydrosilation catalysts are used in the manufacture of siHcone polymers. Several platiaum coordination compounds are important chemotherapeutic agents used for the treatment of cancer. 

A range of acetoacetylated lesins has been intioduced (68,69). The acetoacetoxy functionahty can be cioss-linked with melamine—formaldehyde resins, isocyanates, polyacrylates, and polyamines. There is particular interest for possible corrosion protection on steel because the acetoacetoxy group can form coordination compounds (qv) with iron, perhaps enhancing the adhesion to steel surfaces (see Chelating agents). 

It is possible to determine the concentration of certain metal ions by performing a titration in which the complexation of the metal is the essential reaction. Typically, a chelating agent such as EDTA is used because the complexes formed are so stable. The specific composition of complexes formed in solutions often depends on the concentrations of the reactants. As a part of the study of the chemistry of coordination compounds, some attention must be given to the systematic treatment of topics related to the composition and stability of complexes in solution. This chapter is devoted to these topics. 

In addition to the information that can be obtained from DC polarography as indicated above, polarography can also be used to study solution equilibria of coordination compounds. Thus from measurements of the shift of E1/2 with solution environment, such as pH or concentration of complexing agent, it is possible to ascertain both the stoichiometry and values of the equilibrium constants of the species formed. For example, cis-[Run(bipy)2(H20)2]2+ was found1 to undergo... 

Mercury(II) is also a very effective masking agent for Cl-, Br- and I- as well as S03 . Masking of fluoride ions is important analytically and this can be done effectively by transforming it into a variety of stable coordination compounds, e.g. boric acid yields BF4-, beryllium gives BeF42-and a number of stable octahedral complexes are formed with Al, Fe, Ti, Zr, Nb and Ta. 

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