Submitted by Maggie Geselbracht / Reed College on Thu, 04/17/2008 - 19:47
My Notes

This paper describes the synthesis and characterization of a Cr(I) dimer with a very short Cr-Cr distance.  Computational studies support fivefold bonding between the chromium atoms.  I have used this paper to introduce metal-metal multiple bonds and discuss the molecular orbital interactions of homonuclear diatomics including d-orbitals.  More generally, it is a nice example to stimulate the discussion of what constitutes a bond and the various interpretations of bond order.

Attachment Size
Quintuple bond discussion questions 28 KB
Implementation Notes

Students are asked to read the paper and answer the discussion questions before coming to class. I used this paper in a second-year inorganic course after we had talked about MO theory of diatomics but fairly early in our discussion of transition metal chemistry. There is a Perspectives article in Science that goes along with this paper, but I decided not to give it to the students as I wanted them to work out the MO diagram for themselves.

Time Required
50 minutes
Evaluation Methods

Student performance on the discussion questions is assessed.

Creative Commons License
Attribution, Non-Commercial, Share Alike CC BY-NC-SA