30 Jun 2016

Kecking over Electron Counting Formalisms? An In-Class Exercise in Counting Electrons for Ru Complexes with Proton-Responsive Ligands in the CBC and Ionic Methods

In-Class Activity

Submitted by Richard Lord, Grand Valley State University

Electron counting exercise motivated by a recent paper (J. Am. Chem. Soc. 2015, 137, 12808-12814 doi: 10.1021/jacs.5b08406) featuring a proton switchable ligand.

Learning Goals: 

Students will be able to:

- assign charges at ligation points in the ionic formalism (L/X classification in the CBC formalism) to count electrons and assign oxidation states (valence numbers).

- describe how tautomerization in proton-responsive ligands affects bonding and electron count.

Equipment needs: 


Implementation Notes: 

This exercise has not been implemented yet. We have provided materials for students and faculty in both the ionic and CBC formalisms. The ChemDraw file used to create all images is also attached in case you want to edit any of the images we provide.

Time Required: 
We estimate that this exercise will take 20-30 minutes for you to explain the ligand tautomerization and have the students work through the exercise.
Evaluation Methods: 

You could choose other compounds from the Szymczak paper, such as the H2 activated species (5) to test the students’ ability to apply this new knowledge.

Evaluation Results: 

This activity has not yet been implemented or assessed.

Creative Commons License: 
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