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2004
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In the Laboratory
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Syntheses and Characterization of Ruthenium(II) Tetrakis(Pyridine) Complexes. An Advanced Coordination Chemistry Experiment or Mini-Project
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Benjamin J. Coe
Department of Chemistry, University of Manchester, Manchester M13 9PL, UK
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May 2004
Vol. 81 No. 5
p. 718
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| Abstract |
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This experiment involves the syntheses of several coordination complexes of ruthenium(II) and their characterization by using various spectroscopic and spectrometric techniques. Because ruthenium is a precious metal all of the reactions are carried out on a small scale, giving students experience in careful laboratory manipulation. This experiment includes the option of extension to allow students to carry out simple experiments of their own devising, acting as an introduction to research work. The known complex trans-RuIICl2(py)4 (2, py = pyridine) is prepared from cis-RuIICl2(DMSO)4 (1, DMSO = dimethylsulfoxide) and then used as a precursor to the chloride-substituted derivative trans-RuII(NCS)2(py)4, 4. Further reactions of 2 with chosen salts can also be carried out, if desired. The new complex trans-RuIICl2(acpy)4 (3, acpy = 4-acetylpyridine) is also prepared from 1. Complexes 2–4 and any further product(s) are characterized by using 1H NMR, infrared, and UV-visible spectroscopies and positive ion electrospray or FAB mass spectrometry. The results of these measurements are related to the molecular structures. In particular, the 1H NMR spectra confirm the trans coordination geometries, while the UV–visible spectra show intense dπ(RuII) → π*(py or acpy) metal-to-ligand charge-transfer (MLCT) absorptions. The relative energies of these MLCT bands can be qualitatively correlated with the electronic properties of the ligands.
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| Supplement |
Instructions for the students, notes for the instructor and answers to the questions are available.
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 Contents |
JCE2004p0718W.doc (Microsoft Word)
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| Download |
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| More Information |
Citation |
Coe, Benjamin J. J. Chem. Educ. 2004 81 718.
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Keywords |
Coordination Chemistry; Inorganic Chemistry; Inorganic Synthesis; IR Spectroscopy; Laboratory Instruction; Mass Spectrometry; NMR Spectrometry; Ruthenium; UV-Vis Spectroscopy
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History |
Created:
Last Updated: |
April 1, 2004
February 18, 2005
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| Home > JCE Print > Journal of Chemical Education > Issues >
2004
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May
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718
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