In this experiment, students will synthesize and characterize a series of Ru(II) p-cymene piano-stool complexes. Each complex will contain p-cymene as the "seat" and two chloride donors in addition to a phosphine or phosphite with varying amounts of fluorine, which together serve as the "stands". There are a total of four phosphine ligands and three phosphites, which include triphenylphosphine and trimethylphosphite that do not contain any fluorine. This experiment combines complex synthesis, characterization, data analysis and data sharing.
A student should be able to:
- Prepare a series of Ru(II) phosphine and phosphite complexes
- Characterize the complexes by multi-nuclear NMR spectroscopy
- Characterize the complexes by UV-vis spectroscopy
- Analyze structural data in Mercury
- Use physical characterization data to formulate trends
- Use data tables when appropriate
- Express conclusions
- Write a full ACS journal style lab report
Standard laboratory equipment/glassware
FT-NMR with multinuclear capablity
This experiment will be piloted during the 2016-2017 school year. If others in the VIPEr community try this experiment please post your comments and/or consider filling out the feedback file attached and sending to firstname.lastname@example.org
Students will synthesize and characterize one compound each, and should share spectral and other characterization data in order to perform a complete study for their report. All complexes are air-stable and can be prepared without the need for anaerobic techniques. Students should form a hypothesis on the donor ability of the ligand and then use their characterization data along with the structure of the phosphine or phosphite to support and/or refine their original predictions.
When implemented during the 2016-2017 school year a formal lab report will be required. However, other suitable methods would include, but are not limited to an oral presentation or a lab memo.
The experiment described herein will be piloted during the 2016-2017 school year. However, all complexes have been prepared by undergraduate students/researchers at all levels during the completion of the original project.