Abstract

The absorption bands in the region 1100–900 cm⁻¹ permit reliable differentiation of the mono, bis, and tris perfluorophenoxy-<i>s</i>-triazines. Although fluoro-substituted alkoxy-<i>s</i>-triazines do not produce medium or strong bands in this range, one strong, sharp band is observed at 1000 cm⁻¹ in the spectra of the solid 2-perfluorophenoxy-4, 6-bis (perfluoroalkoxy)-<i>s</i>-triazines. One strong band at 1000 cm⁻¹ and a medium band near 980 cm⁻¹ are observed in the spectra of the solid 2,4-bis (perfluorophenoxy)-6-perfluoroalkoxy-<i>s</i>-triazines. Three strong bands at 1000, 977, and 965 cm⁻¹ are observed in the spectrum of solid 2,4,6-tris-(perfluorophenoxy)-<i>s</i>-triazine. Thus, the variation in the intensity and the number of bands in the range 1100–900 cm⁻¹ is a function of the number of per-fluorophenoxy groups attached to <i>s</i>-triazine. Only two bands are observed in the spectra of liquid and dissolved samples, but the intensity of the band near 980 cm⁻¹ remains a function of the number of per-fluorophenoxy groups attached to the C₃N₃ ring. These bands and those of other perfluorophenyl derivatives are compared in Table I.

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