赤外線吸収スペクトルによるChlorobenzotrifluorideの異性体の定量

概要

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It is rather difficult to determine the p-and m-isomers of chlorobenzotrifiuoride by ordinary chemical analyses. In general, infrared spectro-photometry is the most suitable method for the determination of position isomers. Four methods of infrared analysis were applied to these compounds, and the results were tested by Youden's method. The key bands used were 9.84 and 12, 01 μ, in wavelengths for the p-isomer, and 11.26 and 12.28p, for the m-isomer. The absorbency was measured in CS2 solutions using cells of 0.1 mm thickness. The standard method and the ratio method were applied satisfactorily to mixtures containing the p-isomer in an amount 10?80%, standard deviations being 0.4?0.7%; while the base line method and the differential method were applied also satisfactorily to mixtures containing less than 10% of the p-isomer with standard deviations of 0.06?0.10%. It was found that the apparent extinction coefficient of the p-isomer is slightly affected by the concentration of the m-isomer in the solvent in the case of the base line and the differential methods.
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