In the beginning of the 1980's, Prof. Richard Andersen has reported the synthesis of an organometallic soluble bispentamethylcyclopentadienyl divalent ytterbium complex. Soon after, the synthesis of the bipyridine adduct of the latter allowed to unravel a singular magentic behavior; the molecule was thus only published decades later in 2002. Yet, the magnetism properties remained difficult to analyszed until L<sub>III</sub>-edge XANES data and multi-referencial CASSCF computations allowed a rationalization: the moelcule has an intermediate valence state, neither divalent, nor trivalent, but both in the same time. The work we intend to present is the continuation of this story, which has now extended to other elements and molecules combining organolanthanide fragments and transition metal fragements. Small molecule activation reativity as well as original structures will be highlighted, such as a series a molecules, which present an apparent break in the lanthanide contraction. Molecules are clever than us!

Molecules are clever than us!

ACS Spring 2022

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.