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Lecture 27 4/4/07

Lecture 27 4/4/07. Complex ions and Coordination complexes. Central metal and ligands Complex ions vs. Coordination complexes. Complex formation can change physical and chemical properties. Ag + (aq) + e -  Ag (s) E ° = 0.799 V

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Lecture 27 4/4/07

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  1. Lecture 27 4/4/07

  2. Complex ions and Coordination complexes • Central metal and ligands • Complex ions vs. Coordination complexes

  3. Complex formation can change physical and chemical properties Ag+ (aq) + e- Ag (s) E° = 0.799 V [Ag(CN)2]- + e-  Ag (s) + 2CN- (aq) E° = - 0.31 V

  4. Geometry

  5. Naming complex compounds

  6. Name, coordination number, and geometry? [Co(NH3)3(OH)3] K[Cr(NH3)2(C2O4)2] diamminetriaquahydroxochromium (III) nitrate Potassium tetrachloroplatinate (II)

  7. Two ethylenediamine ligands and 2 chloride ions form a complex ion with Co3+ • Write the formula of the complex ion. • What is the coordination number of cobalt? • Rewrite the formula with the appropriate chloride counter ions.

  8. Isomers: Structural Same molecular formula, different bonding arrangement • Coordination isomerism: • Linkage isomerism:

  9. Isomers: Stereoisomers • Geometric (only square planar and octahedral) • cis • trans

  10. Isomers: Stereoisomers • Optical: mirror images • Octahedral complexes

  11. 19-97 • A student wanted to measure the copper (II) concentration in an aqueous solution. For the cathode half-cell she used a silver electrode with a 1.00 M solution of AgNO3. For the anode half-cell she used a copper electrode dipped into the aqueous sample. If the cell gave a Ecell = 0.62 V at 25ºC, what was he copper (II) concentration of the solution?

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