title: CO activation on the late lanthanide dimers: matrix infrared spectra of the Ln2[eta2(mu2-C, O)]x (Ln = Tb, Dy, Ho, Er, Lu; x = 1, 2) molecules.
abstract: Reactions 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[eta2(mu2-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[eta2(mu2-C, O)]x molecules are predicted to have planar structures, which carry asymmetrically bridging CO moieties that are tilted to the side.
authors.affiliation: National Institute of Advanced Industrial Science and Technology (AIST), Ikeda, Osaka 563-8577, Japan.
authors.forename: Ling
authors.initials: L
authors.lastname: Jiang
authors.forename: Xi
authors.initials: X
authors.lastname: Jin
authors.forename: Mingfei
authors.initials: M
authors.lastname: Zhou
authors.forename: Qiang
authors.initials: Q
authors.lastname: Xu