Abstract
Polarized IR spectroscopy can provide useful information about the orientation of molecules in the solid state and is particularly important in substantiating vibrational assignments. To do these measurements, it is necessary to cut thin, transparent wafers from single crystals of the material of interest—not always a trivial task. An alternative approach is to orient the compound in a nematic liquid crystal solvent, a procedure that has been successfully used in studying the polarized IR spectra of transition metal carbonyl complexes such as <i>M</i><sub>2</sub>(CO)<sub>10</sub> (<i>M</i> = Mn, Re), (η<sup>5</sup>-C<sub>5</sub>H<sub>5</sub>) Mn (CO)<sub>3</sub>, and Cr(CO)<sub>6</sub>. Liquid crystal solvents are somewhat limited in their use, however, chiefly because of the complexity of their IR spectra, but their expense and their somewhat restricted shelf-lives are also important factors. We present here a novel alternative method of obtaining polarized IR spectra.
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