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This LO was written by the IONiC Leadership Council to celebrate Steve Koch as the recipient of the 2024 ACS Award for Distinguished Service in Advancement of Inorganic Chemistry. Steve has been a major supporter of the IONiC community since its inception. This LO is based on the article New Members of the Class of [Fe(CN)x(CO)y] Compounds. published in Inorganic Chemistry (DOI: 10.1021/ic015604y).
In addition to his service to the community, Prof. Koch has had a distinguished career studying coordination compounds to elucidate the structure of function of metal ions in biological systems. The compounds discussed in this paper are of additional interest because meteorites carry similar compounds, specifically [FeII(CN)5(CO)]3- and [FeII(CN)4(CO)2]2- (DOI: 10/1038/s41467-019-10866-x). It is possible that these iron cyanocarbonyl complexes may have been precursors to the iron cyanocarbonyl complexes that are present in hydrogenases.
| Attachment | Size |
|---|---|
| Koch Literature Discussion Questions (pdf) | 36.5 KB |
| Literature Discussion Questions (editable) | 24.37 KB |
| IR spectrum of cis-[Fe(CN)4(CO)2]2- | 232.12 KB |
| Ir spectra of trans-[Fe(CN)4(CO)2]2- including 13C labeled CN and CO | 40.15 KB |
| IR and Raman spectra of fac-[Fe(CN)3(CO)3]- | 56.19 KB |
Through completing this literature discussion, students will be able to
- Label the symmetry elements of coordination complexes and determine their point groups.
- Use group theory and infrared and Raman data to determine which geometric isomer of a coordination complex is formed.
- Use the CBC electron counting method to classify coordination compounds; determine the electron number, ligand bond number, metal valence, and dn count.
- Locate references from the primary literature cited by the article.
- Compare and contrast features the geometry and metal coordination environment in coordination compounds.
There are many options for implementing this literature discussion. Instructors could provide the article and questions in advance and have the students discuss in small groups during class. Alternatively students could read the article before class and complete the questions during class.
Evaluation
Possible methods of evaluation include
- collect student answers to the guiding questions before the discussion takes place in class;
- collect student answers after the class discussion; or
- collect answers written by small groups during the discussion.
This LO has not yet been implemented.
Comments
Steve was kind enough to include several unpublished spectra of these compounds which is a wonderful update to this LO.