Reactions of lanthanide atoms with oxygen difluoride and the role of the Ln oxidation state

Inorganic Chemistry
Tanya MikulasLester Andrews

Abstract

Laser-ablated lanthanide metal atoms were condensed with OF2 in excess argon or neon at 4 K. New infrared absorption bands were observed and assigned to the oxidative addition products OLnF2 and OLnF on the basis of (18)O isotopic substitution and electronic structure calculations of the vibrational frequencies. The dominant absorptions in the 500 cm(-1) region are identified as Ln-F stretching modes, which follow the lanthanide contraction. The Ln-O stretching frequency is an important measure of the oxidation states of the Ln and oxygen and the spin state of the complex. The OCeF2, OPrF2, and OTbF2 molecules have higher frequency Ln-O stretching modes. The Ce is assigned to the IV oxidation state and the Pr and Tb are assigned to a mixed III/IV oxidation state. The remaining OLnF2 compounds have lower Ln-O stretches, and the Ln is in the III oxidation state and the O is in the -1 oxidation state. For all of the OLnF compounds, the metal is in the III oxidation state, and the Ln-F bonds are ionic. In OCeF2, OLaF, and OLuF, the bonding between the Ln and O is best described as a highly polarized σ bond and two pseudo π bonds formed by donation from the two 2p lone pairs on the O to the Ln. Bonding for the OLnF2 compounds in the...Continue Reading

References

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Citations

Nov 7, 2015·Inorganic Chemistry·Thomas Vent-Schmidt, Sebastian Riedel
May 21, 2016·The Journal of Physical Chemistry. a·Oliver Mooßen, Michael Dolg
Jan 21, 2016·Chemistry : a European Journal·Thomas Vent-SchmidtSebastian Riedel
Jun 11, 2020·Dalton Transactions : an International Journal of Inorganic Chemistry·Thaige P GompaHenry S La Pierre
Sep 20, 2017·The Journal of Physical Chemistry. a·Rui WeiDavid A Dixon

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