Abstract

MULLER, Alfred J. et al. Characterization and oxidative addition reactions of different rhodium and iridium triazolato complexes. S.Afr.j.chem. (Online) [online]. 2010, vol.63, pp.11-19. ISSN 1996-840X.

A number of different rhodium(I) and iridium(I) triazolato complexes and their oxidative addition products (triazolate = 3,5-bis(pyridine-2-yl)-1,2,4-triazolate (bpt^-) and 4-amino-3,5-bis(pyridine-2-yl)-1,2,4-triazolate (bpt-NH^-)) were prepared and characterized by means of IR and ¹H NMR spectroscopy, elemental analysis and computational chemistry methods. The oxidative addition reactions of these complexes with iodomethane in different solvents indicated simple second-order kinetics with the faster reactions in the more polar solvents (1.44(7) x 10^-2 L mol^-1 s^-1 in dichloromethane compared with 9.2(5) x 10^-4 L mol^-1 s^-1 in benzene for iridium bpt-NH). ¹H NMR data and density functional theory calculations illustrate that the coordination of the metal centre in [M(bpt-NH)(cod)] (M = Rh or Ir) occurs via the amine moiety and a nitrogen of a pyridine ring.

Keywords : Rhodium(I); iridium(I); triazole; cyclooctadiene; oxidative addition; methyl iodide; DFT.

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