problem set 5 - Chemistry 312 Problem Set 5(due Friday...

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Chemistry 312 Problem Set 5 (due Friday, August 5) 1. I stated in lecture that, for octahedral symmetry molecules, the ligand atom p orbitals oriented perpendicular to the metal-ligand bond would belong to the symmetry species T 1g , T 1u , T 2g , and T 2u . Using drawings or reducible representations, show that this is the case. You will have to choose your phases wisely. 2. Diamagnetic complexes of cobalt (III) like [Co(NH 3 ) 6 ] 3+ and [Co(en) 3 ] 3+ are orange- yellow, while paramagnetic cobalt (III) complexes like [CoF 6 ] 3– and [Co(H 2 O) 3 F 3 ] are blue. Explain, using abridged MO diagrams, this difference in color. 3. Predict which complex in each of the following pairs will have the lower energy d–d transition, and give a short reason for your choice: a. [Co(NH 3 ) 5 Cl] 2+ or [Co(NH 3 ) 5 NO 2 ] 2+ b. [Co(CN) 6 ] 3– or [Ir(CN) 6 ] 3– 4. a. The complex [Cu(H 2 O) 6 ] 2+ ought to be octahedral; however, measurements of the
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