Ligand-centred reactivity of bis(picolyl)amine iridium: sequential deprotonation, oxidation and oxygenation of a "non-innocent" ligand
Tejel, C., del Rio, M.P., Ciriano, M.A., Reijerse, E.J., Hartl, F., Zalis, S., Hetterscheid, D.G.H., Spithas, N.T.I. and de Bruin, B. (2009) Ligand-centred reactivity of bis(picolyl)amine iridium: sequential deprotonation, oxidation and oxygenation of a "non-innocent" ligand. Chemistry- A European Journal, 15 (44). pp. 11878-11889. ISSN 0947-6539
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To link to this article DOI: 10.1002/chem.200901017
Treatment of [Ir(bpa)(cod)](+) complex (+) with a strong base (e.g., tBuO(-)) led to unexpected double deprotonation to form the anionic [Ir-(bpa-2H)(cod)](-) species (-), via the mono-deprotonated neutral amido complex [Ir(bpa-H)(cod)] as an isolable intermediate. A certain degree of aromaticity of the obtained metal-chelate ring may explain the favourable double deprotonation. The rhodium analogue (-) was prepared in situ. The new species [M(bpa-2H)(cod)](-) (M = Rh, Ir) are best described as two-electron reduced analogues of the cationic imine complexes [M-I(cod)(Py-CH2-N=CH-Py)](+). One-electron oxidation of (-) and (-) produced the ligand radical complexes * and *. Oxygenation of (-) with O-2 gave the neutral carboxamido complex [Ir(cod)(py-CH2-N-CO-py)] via the ligand radical complex * as a detectable intermediate.