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CO Activation on the Late Lanthanide Dimers: Matrix Infrared Spectra of the Ln2[η2(μ2-C, O)]x (Ln = Tb, Dy, Ho, Er, Lu; x = 1, 2) Molecules
journal contribution
posted on 2008-04-24, 00:00 authored by Ling Jiang, Xi Jin, Mingfei Zhou, Qiang XuReactions of laser-ablated late lanthanide atoms (Tb, Dy, Ho, Er, Tm, Yb, and Lu) with dilute carbon monoxide
molecules in solid argon have been investigated using matrix-isolation infrared spectroscopy. The Ln2[η2(μ2-C, O)]x (Ln = Tb, Dy, Ho, Er, Lu; x = 1, 2) molecules are observed upon sample annealing, whereas no
product is observed for Tm and Yb. The C−O stretching frequencies in these dilanthanide carbonyls range
from 1100 to 1300 cm-1, far below the value of free CO in the gas phase (2143.5 cm-1), implying that the
C−O bonds are highly activated. Density functional theory calculations have been performed on these products.
These Ln2[η2(μ2-C, O)]x molecules are predicted to have planar structures, which carry asymmetrically bridging
CO moieties that are tilted to the side.