This In-Class Activity Learning Object explores a series of uranyl, UO22+, complexes reported by Dr. Carol Burns and co-workers. The impact of the electron-rich silylamide ligand, -N(SiMe3)2, on the uranium-oxygen bonds of the uranyl cation, UO22+, is explored.
This LO is part of a special VIPEr collection honoring the 2021 ACS National Award recipients in the field of inorganic chemistry. Carol J. Burns was the recipient of the Francis P. Garvan-John M Olin Medal for exceptional service to the chemistry community through pioneering research in actinide chemistry, service in national security, and championing workforce development and equity in science.
A student will be able to
- describe the sigma-donating and pi-donating nature of an amide ligand
- explain the relationship between vibrational frequency and bond strength
- use vibrational data to explain trends in bond strength
I would use this as a small group in-class exercise and not give them the paper in advance. (It would also make a good homework problem.) I would make each group responsible for writing the answer to one question on the board and then ask them to explain their answer to the class.
I would grade the students’ written responses to the questions, which after the class discussion should be correct!
Students may not be familiar with Raman spectroscopy but can be reassured that it measures vibrational frequencies like infrared spectroscopy. Students will likely need help finding the information in the paper. There’s a hint in the student handout telling them to skip to the bonding section.