170 likes | 404 Views
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
E N D
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 [Ag(CN)2]- + e- Ag (s) + 2CN- (aq) E° = - 0.31 V
Name, coordination number, and geometry? [Co(NH3)3(OH)3] K[Cr(NH3)2(C2O4)2] diamminetriaquahydroxochromium (III) nitrate Potassium tetrachloroplatinate (II)
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.
Isomers: Structural Same molecular formula, different bonding arrangement • Coordination isomerism: • Linkage isomerism:
Isomers: Stereoisomers • Geometric (only square planar and octahedral) • cis • trans
Isomers: Stereoisomers • Optical: mirror images • Octahedral complexes
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?