Beginning with Peter Fulde's suggestion in the late 1980s that a molecular analogue to the Kondo effect may exist in certain Ce- and Yb-based organometallic molecules, an incredibly rich array of adducts to Cp*2Yb have been synthesized that demonstrate intermediate valence in Yb in conjunction with magnetic singlet formation, two coupled hallmarks of the Kondo effect. Although a metallic band does not exist in these molecules, and therefore the comparison to the Kondo effect remains only a strong analogy, these molecules are essentially quantum-confined metals where the conduction band is eliminated by size effects, and therefore should be thought of as quantum confined Kondo materials. These molecules and our progress in sythesizing and studying them will be reviewed (including Norman's role), with an emphasis on the temperature dependence of the x-ray spectroscopy and the magnetism. Progress toward understanding these molecules in terms of multiconfigurational ground states and the role of covalence will also be described.

Adducts to Cp<sup>x</sup><sub>2</sub>Yb as analogs to metals displaying the Kondo effect under quantum confinement

247th National Meeting (2014)

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Adducts to Cpx2Yb as analogs to metals displaying the Kondo effect under quantum confinement

Adducts to Cp^x₂Yb as analogs to metals displaying the Kondo effect under quantum confinement