|
|
| Home > JCE Print > Journal of Chemical Education > Issues >
2007
>
January
> |
|
In the Laboratory
|
|
|
|
Photochemical Synthesis and Ligand Exchange Reactions of Ru(CO)4(η²-alkene) Compounds
|
Jason Cooke
Department of Chemistry, University of Alberta, Edmonton, AB T6G 2G2, Canada
David E. Berry and Kelli L. Fawkes
Department of Chemistry, University of Victoria, Victoria, BC V8W 3V6, Canada
|
|
January 2007
Vol. 84 No. 1
p. 115
|
|
|
|
|
|
|
| Abstract |
|
Irradiation of Ru3(CO)12 in the presence of either methyl acrylate (CH2=CHCO2CH3) or ethylene generates labile Ru(CO)4(η²-alkene) species that readily react with other two-electron donor ligands, such as triphenylphosphine or the more π-acidic alkene dimethyl fumarate (trans-CH3CO2CH=CHCO2CH3), to produce thermally stable Ru(CO)4L compounds. The experiment can be carried out in a variety of ways, from a microscale approach using standard fluorescent lighting (suitable for large class sizes) to a preparative-scale method using more sophisticated equipment and filtered (λ > 370 nm) high-intensity light (appropriate for smaller, advanced laboratories). The Ru(CO)4L (L = alkene or P(C6H5)3) compounds are readily characterized by infrared spectroscopy and provide an excellent application of the Dewar–Chatt–Duncanson model to metal–carbonyl and metal–alkene bonding. The student is challenged to correlate the relative reactivities and thermal stabilities of the three Ru(CO)4(η²-alkene) compounds with the electronic properties of the coordinated alkene and to understand the corresponding effect on the CO stretching frequencies in the infrared spectra.
|
| Supplement |
Detailed experimental descriptions and additional instructor notes are available.
|
|
| More Information |
|
Citation |
Cooke, Jason; Berry, David E.; Fawkes, Kelli L. J. Chem. Educ. 2007, 84, 115.
|
|
Keywords |
Alkenes; Inorganic Chemistry; IR Spectroscopy; Microscale Lab; Organometallics; Photochemistry; Synthesis; Upper-Division Undergraduate
|
|
History |
Created:
Last Updated: |
12/5/2006
3/20/2007
|
|
|
|
|
|
 Caution! | | Experiments, laboratory exercises, lecture demonstrations, and other descriptions of the use of chemicals, apparatus, instruments, computers, and computer interfaces are presented in the Journal of Chemical Education as illustrative of new or improved ideas or concepts in chemistry instruction and are directed at qualified teachers. Although every effort is made to assure and encourage safe practices and safe use of chemicals, the Journal of Chemical Education cannot assume responsibility for uses made of its published materials. Many chemicals are hazardous. Precautions for the safe use of hazardous chemicals and directions for their proper disposal are described in the Material Safety Data Sheets and on the labels. We strongly urge all those planning to use materials from our pages to make choices and to develop procedures for laboratory and classroom safety in accordance with local needs and situations. |
|
|
| |
|
| Home > JCE Print > Journal of Chemical Education > Issues >
2007
>
January
> Page
115
|
|
|
| JCE HS CLIC |
|
Our Secondary School editors work hard to distill all the JCE materials to produce a fraction of particular interest to high school teachers. We call it CLIC.
|
| Contributions Welcome |
| JCE welcomes your submission |
| Advertisers |
| In recent years we have worked hard to better match our advertisers with our readers. When shopping for chemistry education materials, visit our advertisers' WWW sites first. |
| Be An Ambassador |
| Take JCE along on your outreach missions. Copies of the Journal, guest access to JCE Online, our publications catalog, and more are available for your participants. |
|
