The Infrared Dichroism and Molecular Orientation of Modifying Reagents, l-β-Phenyllactic Acid and l-β-Phenyl-α-alanine, in Thin Films on Nickel Metal Surfaces

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Abstract
The infrared absorption spectra of thin films of modifying reagents, l-β-phenyllactic acid and l-β-phenyl-α-alanine, formed on nickel metal plates were measured by the high-sensitivity reflection method. From the infrared dichroism in the reflection spectra, the molecular orientations in the thin films were deduced. The C=O and alcoholic O–H bonds of l-β-phenyllactic acid are oriented nearly vertical to the metal surface, whereas the carboxyl O–H bond and the benzene ring are parallel to the surface. The benzene ring and the C–N bond in l-β-phenyl-α-alanine are oriented nearly parallel to the metal surface, while the O···O axis of the carboxylate group is inclined to the surface.