A triazenido ligand functionalized with pyridine and a chlorinated aryl reacted with the dimers [MCl2Cp*]2 [M = Rh(III), Ir(III)] and [RuCl2(p-cymene)]2 in acetonitrile at room temperature to generate three mononuclear complexes (1-3). In the Rh(III) and Ir(III) complexes the ligand coordinates to the metal via the central nitrogen of the triazenido system and the pyridine nitrogen. In the Ru(II) complex a bidentate four member quelate was obtained where the ligand coordinates through the terminal nitrogens of the triazenido system (Figure 1). The Ru(II) complex was tested as a catalyst in transfer hydrogenation reactions. The catalytic reactions were performed at 70 °C in 2-propanol as solvent, 10 mol% of KOH and 2 mol% of 3. The selectivity of the catalyst to hydrogenate only the carbonyl group in the presence of an olefin fragment was one of the most satisfactory results (Figure 2).

Half-sandwich organometallic complexes incorporating a triazenido ligand functionalized with pyridine

251st National Meeting (2016)

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