Fourier Transform Infrared Spectra of Organic Compounds in Solution and as Thin Layers Obtained by Using an Attenuated Total Internal Reflectance Fiber-Optic Cell

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Abstract

A cell lined with Teflon fluorocarbon resin, containing a silver halide (AgBr/AgCI) Infrared fiber, allows convenient and reproducible loading of organic solutions and solids (amorphous or crystalline) derived by evaporation of the solvent. Attenuated total Internal reflectance (ATR) measurements with a Fourier transform Infrared (FT-IR) spectrometer are reported for organic compounds. Known spectroscopic features can be recognized with quantities as small as 6 ng (ca. 1/20th of a monolayer). Usable spectra are obtainable with 100-ng quantities (1 monolayer), and high-quality spectra are measurable with 10-/μg quantities. Absorbance is linear up to ca. 600 monolayers (0.55-μm layer thickness), the limit of absorption being ca. O.9-μm layer thickness (about 1000 molecular layers).

Original languageEnglish
Pages (from-to)1908-1910
Number of pages3
JournalAnalytical Chemistry
Volume60
Issue number18
DOIs
StatePublished - 1 Sep 1988

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