CHEMISTRY 171: PROBLEM SET #8 (11/21/07) Due: WEDNESDAY, December 3, 2007 1. Diamagnetic complexes of cobalt(III), such as [Co(NH3) 6 ] +3 , [Co(en) 3 ] +3 and [Co(NO 2 ) 6 ]-3 are orange-yellow. In contrast the paramagnetic complexes [CoF 6 ]-3 and [Co(H 2 O) 3 F 3 ] are blue. Explain qualitatively this difference in color. 2. Both nickel and platinum belong to the same family of the periodic table, but the complexes (NiCl 4 ) 2-and (PtCl 4 ) 2- differ considerably in geometry, color and magnetism. a. Using any theory of your choice, discuss the magnetic, geometric and spectroscopic properties of these complexes. b. By analogy, predict the above properties for [Ni(CN) 4 ] 2-. Explain. 3. Give the structural formulas for all the possible isomers of each of the following. Indicate which are stereoisomers. a. [Co(en) 2 Cl 2 ] + b. [Co(en) 2 (NH 3 )Cl] 2+ c. [Co(en)(NH 3 ) 2 Cl 2 ] + d. [Co(en) 2 (Cl)NO 2 ] + 4. Draw the σ and π molecular orbitals of C 2 H 4 that are used to bond the molecule to Pt
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