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It is known that substituted benzenes have more or less characteristic absorption frequencies in the 700 800 cm-1 region. The intensity and shifting of the band(s) depend on the number and the position(s) of the substituent(s).1 The hydroxyl-stabilizing region for phenols is from 3645 to 3657 cm 1 for unshifted compounds. A substantial shift of the absorption band, however, occurs in ortho substituted phenols.2 Variations are also observed within a given class of compounds when measured as solids and liquids, gases or solutions. For years, Fourier-Transform Infrared (FTIR) techniques have been applied to detect and identify compounds separated by gas chromatography.3 Interpretation of the spectra is approached in several ways, as suggested by Delaney et al.2 Among these methods, a manual assignment of the bands and computerized spectral interpretation methods are commonly used. The Environmental Protection Agency (EPA) vapor phase library is one of the most commonly known and used.4 However, the availability of vapor-phase reference spectra in libraries is limited. Our search to compare and identify substituted phenols and substituted phenyl ethers from existing library sources was not completely successful. We encountered a limited number of reference spectra of substituted phenols and fewer reference spectra of substituted phenyl ethers. The spectra of the compounds successfully retrieved from the EPA vapor phase library were found not to be in good agreement with the observed frequencies of substituted phenols and substituted phenyl ethers encountered under our experimental conditions. To supplement the use of the library in support of in-house analytical requirements, additional spectra of these compounds are routinely included in the main spectral library. By a manual assignment of the bands, we have discerned orthoand para-substitution as well as the substituents on the benzene ring in the phenols and phenyl ether compounds. Experimental

Vapor-Phase Fourier-Transform Infrared Spectra of Some Substituted Phenol and Substituted Phenyl Ether Compounds