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Unformatted text preview: and a water molecule. Since the nitrogen ligands are σ-donors and the water molecule is a π-donor, the HOMO-LUMO gap ( ∆ o ) is fairly small, so that the complex absorbs orange light and appears blue. However, when oxygen binds, it displaces the water molecule from the sixth position around the Fe atom. O 2 is a weak π-acceptor, so that the ∆ o gap increases and the absorption shifts to higher energy (green), so that the color changes to red. 3. What is the d count of the metal in [Mo(gly) 2 (NH 3 ) 2 ]Cl? (2 points) Cl-is an outer sphere ligand and balances the charge of the actual complex, so that the complex is [Mo(gly) 2 (NH 3 ) 2 ] + . NH 3 is a neutral ligand, but gly (glycine) is negatively charged; thus, the Mo must be a +3 ion since the charge on the entire complex is +1. When Mo is neutral, it has a total of 6 valence electrons; so, Mo +3 must be a d 3 ion....
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This homework help was uploaded on 04/18/2008 for the course CHEM 131 taught by Professor Landry during the Spring '08 term at Vermont.
- Spring '08