INFRARED SPECTRA OF MATRIX ISOLATED $MgF_{2}$
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Date
1974
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Ohio State University
Abstract
Previous studies of $MgF_{2}$ identified stretching modes of $MgF_{2}$ at 840 and $480 cm^{-1}$ and a band at $740 cm^{-1}$ as $MgF.^{1}$ We have reassigned the 740 and $480 cm^{-1}$ bands to a dimeric molecular species which increases in concentration, relative to monomeric $MgF_{2}$, when the rate o£ trapping of $MgF_{2}$ is increased. The isotopic band intensities which appear to indicate a molecular species with a single magnesium are explained by an unusual dimeric structure. Isotopic splittings of the $MgF_{2}$ asymmetric stretching mode Wave been measured in $N_{2}$, Ar, Ne matrices and appear to show a slight trend to higher bond angle, e.g., $155^{\circ}$ to $165^{\circ}$, in going from $N_{2}$ to Ne. Since a matrix induced bending of $MgF_{2}$ appears possible matrix infrared data do not support the assignment of a non-linear geometry Co molecular $MgF_{2}$ as a gas.
Description
$^{1}$D. E. Mann, C. V. Calder, K. S, Seshadri, D. white, and M. J. Linevsky, J. Chem. Phys. 46, 1138 (1967).
Author Institution: Department of Chemistry, Rice University
Author Institution: Department of Chemistry, Rice University