Ruthenium Vinylidene and Acetylide Complexes. An Advanced Undergraduate Multi-technique Inorganic/Organometallic Chemistry Experiment

• Andrew M. McDonagh ^[1] ; Geoffrey J. Deeble ^[1] ; Steph Hurst ^[1] ; Marie P. Cifuentes ^[1] ; Mark G. Humphrey ^[1]
  1. [1] Australian National University

     Australian National University

     Australia

     
• Localización: Journal of chemical education, ISSN 0021-9584, Vol. 78, Nº 2, 2001, pág. 232
• Idioma: inglés
• Texto completo no disponible (Saber más ...)
• Resumen

  • This experiment describes the isolation and characterization of complexes containing examples of two important monohapto ligands, namely vinylidene and alkynyl 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).