Abstract
The reaction of the ytterbium(II) bis(indenyl) complex (C9H7)2Yb(thf)2 (1) with 2,2’-bipyridine afforded the diamagnetic (C9H7)2Yb(bipy) compound (2), whose structure was established by X-ray diffraction analysis. Under similar conditions, the reaction of complex 1 with 1,4-bis(2,6-diisopropylphenyl)-1,4-diazabuta-1,3-diene (DAD) led to oxidation of ytterbium giving rise to the paramagnetic (C9H7)2Yb(DAD) complex (3). Magnetic measurements, X-ray diffraction study, and 1H NMR spectroscopy in benzene confirmed the trivalent state of the ytterbium atom and the radical-anionic nature of the diazadiene ligand in complex 3. In the complex 3—solvent system, the oxidation state of metal depends on the coordination ability of the solvent. In benzene, complex 3 exists as (C9H7)2YbIII(DAD·-), whereas (C9H7)2YbII(thf)2 and DAD0 are present in THF.
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