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2001
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In the Laboratory
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Ruthenium Vinylidene and Acetylide Complexes. An Advanced Undergraduate Multi-technique Inorganic/Organometallic Chemistry Experiment
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Andrew M. McDonagh, Geoffrey J. Deeble, Steph Hurst, Marie P. Cifuentes, and Mark G. Humphrey
Australian National University, Canberra, ACT 0200, Australia
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February 2001
Vol. 78 No. 2
p. 232
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| Abstract |
This experiment describes the isolation and characterization of complexes containing examples of two important monohapto ligands, namely vinylidene (C=CHR) and alkynyl (C  º CR) ligands. The former is a tautomer of acetylene that has minimal (10-10 s) existence as an uncomplexed molecule, providing an interesting example of the stabilization of reactive organic species at transition metals--an important motif in organometallic chemistry. The latter ligand affords complexes that have attracted a great deal of interest recently for their potentially useful electronic or optical properties, illustrating a major focus of contemporary organometallic chemistry, the search for useful materials. The particular strength of this experiment is in demonstrating the utility of a range of spectroscopic and analytical techniques in inorganic complex identification. The students observe unusual chemical shifts in the 13C NMR (vinylidene metal-bound carbon), meet heteronuclear NMR (31P), assign intense metal-to-ligand charge transfer (MLCT) bands in the UV-visible spectra, observe the utility of mass spectra in characterizing complexes of poly-isotopic transition metals, and are introduced to redox potentials (cyclic voltammetry).
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| Supplement |
Notes for the instructor, a handout for students, and sample spectra are available.
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JCE2001p0232W.doc; JCE2001p0232Wfig2CV.jpg; JCE2001p0232Wfig2MS.jpg; JCE2001p0232Wfig2P.jpg; JCE2001p0232Wfig3aC1.jpg; JCE2001p0232Wfig3aC2.jpg; JCE2001p0232Wfig3aCV.jpg; JCE2001p0232Wfig3aH.jpg; JCE2001p0232Wfig3aIR2.jpg; JCE2001p0232Wfig3aMS.jpg; JCE2001p0232Wfig3aP.jpg; JCE2001p0232Wfig3aUV.jpg; JCE2001p0232Wfig3bC1.jpg; JCE2001p0232Wfig3bC2.jpg; JCE2001p0232Wfig3bC3.jpg; JCE2001p0232Wfig3bCV.jpg; JCE2001p0232Wfig3bH.jpg; JCE2001p0232Wfig3bIR.jpg; JCE2001p0232Wfig3bIR2.jpg; JCE2001p0232Wfig3bMS.jpg; JCE2001p0232Wfig3bP.jpg; JCE2001p0232Wfig3bUV.jpg; JCE2001p0232Wfig4aC1.jpg; JCE2001p0232Wfig4aC2.jpg; JCE2001p0232Wfig4aCV.jpg; JCE2001p0232Wfig4aH.jpg; JCE2001p0232Wfig4aIR.jpg; JCE2001p0232Wfig4aMS.jpg; JCE2001p0232Wfig4aP.jpg; JCE2001p0232Wfig4aUV.jpg; JCE2001p0232Wfig4bC1.jpg; JCE2001p0232Wfig4bC2.jpg; JCE2001p0232Wfig4bCV.jpg; JCE2001p0232Wfig4bH.jpg; JCE2001p0232Wfig4bIR.jpg; JCE2001p0232Wfig4bMS.jpg; JCE2001p0232Wfig4bP.jpg; JCE2001p0232Wfig4bUV.jpg
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| More Information |
Citation |
McDonagh, Andrew M.; Deeble, Geoffrey J.; Hurst, Steph; Cifuentes, Marie P.; Humphrey, Mark G. J. Chem. Educ. 2001 78 232.
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Keywords |
Electrochemistry; Inorganic Chemistry; IR Spectroscopy; Laboratory Instruction; Mass Spectrometry; NMR Spectrometry; Organometallics; UV-Vis Spectroscopy
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History |
Created:
Last Updated: |
December 22, 2000
August 31, 2005
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| Home > JCE Print > Journal of Chemical Education > Issues >
2001
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February
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232
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