Infrared spectroscopic and density functional theory studies on the CO dissociation by scandium and yttrium dimers

The Journal of Physical Chemistry. a
Ling Jiang, Qiang Xu

Abstract

Reactions of laser-ablated scandium and yttrium atoms with dilute carbon monoxide molecules in solid argon have been investigated using matrix-isolation infrared spectroscopy. On the basis of the results of the isotopic substitution, the change of laser power and CO concentration and the comparison with density functional theory (DFT) calculations, the absorption at 1193.4 cm(-1) is assigned to the C-O stretching vibration of the Sc(2)[eta(2)(mu(2)-C,O)] molecule, which has a single bridging CO that is tilted to the side. This CO-activated molecule undergoes ultraviolet-visible photoinduced rearrangement to the CO-dissociated molecule, c-Sc(2)(mu-C)(mu-O). The cyclic c-Sc(2)(mu-C)(mu-O) molecule has a bridging carbon on one side of the Sc(2) unit and a bridging oxygen on the other. The analogous Y(2)[eta(2)(mu(2)-C,O)] molecule has not been observed, but the CO-dissociated c-Y(2)(mu-C)(muO) molecule has been observed in the Y + CO experiments. DFT calculations of the geometry structures, vibrational frequencies, and IR intensities strongly support the assignments. The CO activation mechanism has also been discussed. Our experimental and theoretical results schematically depict an activation process to CO dissociation.

Citations

Apr 2, 2008·The Journal of Chemical Physics·Ling Jiang, Qiang Xu
Mar 30, 2017·Physical Chemistry Chemical Physics : PCCP·Jinghan ZouLing Jiang
Feb 20, 2018·Chemistry : a European Journal·Olaf Hübner, Hans-Jörg Himmel
Jan 18, 2008·The Journal of Physical Chemistry. a·Ingmar SwartAndré Fielicke
Oct 6, 2006·The Journal of Physical Chemistry. a·Ling Jiang, Qiang Xu

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