21 Feb 2016

Ligands that Favor/Force Tetrahedral Geometry

Five Slides About

Submitted by Marion E. Cass, Carleton College
Categories
Learning Goals: 

Learning Goals:

Learning Objectives:  Going into this exercise:

  1. Students should be able to determine the oxidation state and d electron count for a given set of metal complexes.
  2. Based on the d electron configuration of a metal ion, students should be able to propose whether that metal ion should prefer a tetrahedral or a square planar geometry for a 4 coordinate complex.
  3. Students should have been introduced to the Jahn-Teller distortion.

Following the Presentation/Discussion:

  1. Students should be introduced to the concept that there are ligands that will force (or less successfully distort while trying to force) tetrahedral geometry on metals ions with d electron configurations that prefer to have a different geometry.
  1. Students should be introduced to the concept that by favoring one geometry over another, one oxidation state of a metal can be preferred over another for a given metal.
  1. Students will be introduced to one application of how ligands of this type can be used to facilitate experiments that probe the chemistry of certain metalloproteins.
Time Required: 
15 minutes
Creative Commons License: 
Creative Commons Licence

Comments

Marion, I hate to tell you this, but one of your examples is not a good one. I have only recently discovered that the [PdCl2(dppfO2)] structure is not correct. I recently found this article (J. Chem. Inf. Model. 2006, 46, 912-929) suggesting that it is really the nickel compound. If you look, this 'box' has been removed from the 4th ed. of Housecroft and Sharpe.

Chip,

I updated this LO and removed the example that highlights the [PdCl2(dppfO2)] structure.

Thanks for the heads up!

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