11 Jan 2017

Group VI metal carbonyl compounds with pincer ligands

Literature Discussion

Submitted by Chip Nataro, Lafayette College

This literature discussion is based on a short paper describing a series of Group VI metal carbonyl compounds that have pincer ligands (Organometallics, 201635, 229). While the paper is relatively straightforward, there are many subtle points that can be brought out by asking the right questions which hopefully this LO does. Some of the questions the students should be able to answer directly from the paper. I feel it is important that they do this. However, these questions nicely set up further questions that require the students to go beyond what is covered in the paper. In addition to the synthesis, there are many questions related to the spectroscopic characterization of these compounds. And of course, it wouldn't be one of my LOs if students weren't being asked to count electrons and do group theory.

File Questions for students21.98 KB
Learning Goals: 

Upon completing this LO students should be able to

  1. Use the CBC method to count electrons in the tungsten compounds in this paper
  2. Describe the bonding interaction between a metal and a terminal carbonyl ligand
  3. Explain how NMR can be used to characterize these compounds including a discussion of 183W satellites
  4. Relate data from IR spectroscopy to the bonding interaction between a metal and a ligand and describe how the IR data can provide information about the electron donor ability of related ligands
  5. Recognize that some observed trends just do not have good explanations
Implementation Notes: 

This might be a bit on the long side, you could certainly omit some of the questions or have the students work on it outside of class.

Time Required: 
50 minutes or so
Evaluation Methods: 

This was developed after the semester in which I teach this material. I look forward to using it next fall and I hope to post some evaluation data at that point.

Creative Commons License: 
Creative Commons Licence


Hi Chip - I'm thinking of adapting this LO as a lab replacement in this current period of isolation. Have you used this LO with your class? Do you have any feedback/common student errors to share?


Yes I have used it in class. I should mention this was in a senior level class pretty much focused on organometallics. My students struggled a bit with the 183W satellites so if I were going to cut anything it would likely be that. Overall it could make a nice lab replacement because there is some wonderful data that they have to interpret. It might be challenging depending on how much you have talked about carbonyls. I kind of beat them over the head with it so my students seemed to pick up on it fairly quickly. They liked the paper overall so I say give it a go and let us know how it works. 

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