Chapter06.June02 - Chapter 6 Applications of Coordination...

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Chapter 6 Applications of Coordination Compounds The sections and subsections in this chapter are listed below. 6.1 Applications of Monodentate Complexes 6.2 Two Keys to the Stability of Transition Metal Complexes Hard and Soft Acids and Bases The Chelate Effect 6.3 Applications of Multidentate Complexes 6.4 Chelating Agents as Detergent Builders 6.5 Bioinorganic Applications of Coordination Chemistry Oxygen Transport Therapeutic Chelating Agents for Heavy Metals Platinum Antitumor Agents Chapter 6 Objectives You should be able to cite examples of transition metal complexes involving monodentate ligands in qualitative analysis, dyes, silver and gold ore processing, nickel purification, and black/white photography define, characterize, rationalize, and use the concept of hard and soft acids and bases as applied to the stability of metal-ligand interactions define, explain, and give examples of the chelate effect cite and explain applications of multidentate complexes drawn from complexometric quantitative analytical methods explain why EDTA is used to remove hard water deposits from hot water boilers and heaters and often added to foods and other consumer products explain the function of detergent builders and the advantages and disadvantages of using phosphates, nitrilotriacetic acid, and carbonates to carry out that function over the years explain the role of hemoglobin and its oxygen complexes in the process of respiration explain how carbon monoxide and cyanide poisoning work explain how and why EDTA, pencillamine, and British anti-lewisite function as therapeutic chelating agents for heavy metals briefly cite some of the history and symptoms of lead and mercury poisoning explain how cisplatin and its derivatives serve as antitumor agents 33
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Solutions to Odd-Numbered Problems 6.1. Diamminesilver(I), [Ag(NH 3 ) 2 ] + , contains Ag(I), a d 10 metal. With no vacancies in d orbitals, coordination compounds containing this cation cannot readily absorb visible light and so remain colorless. On the other hand, tetraamminecopper(II), [Cu(NH 3 ) 4 ] 2+ , contains Cu(II), a d 9 metal that does have vacancies in its d orbitals and therefore readily absorbs visible light. *6.3. Cyanide acts as a halide. In fact, ions such as cyanide (CN - ), thiocyanate (SCN - ), and others (see Chapter 18 for more details) are often referred to as pseudohalides because of their similarities to these ions. Accordingly, cyanide can often be quantitatively analyzed in the same way as the halide ions. One method of doing this is to add a slight excess of a solution of silver nitrate, AgNO 3 , to the cyanide until silver cyanide, AgCN(s), is precipitated, isolated, and then weighed quantitatively. The Liebig method actually refers to the method in which a standardized solution of silver nitrate is used to titrate a solution of cyanide until the first appearance of a precipitate of silver dicyanoargentate(I), Ag[Ag(CN) 2 ]. This reaction becomes the basis of a titrimetric determination of cyanide. 2CN
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Chapter06.June02 - Chapter 6 Applications of Coordination...

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