Indicator paper wavelength

After the reaction product at the Rf value of 0.40 was eluted with water from the chromatogram, its spectrum in neutral solvent and its ionization Ac curve were recorded. The neutral spectrum and the ionization Ac curve of bis-4-hydroxy-3,5-dimethoxyphenylmethane in 47.5% ethanol were also recorded the wavelengths of the ultraviolet absorption maxima of the two compounds—eluted product and reference compound—are given in Table II. The spectra of the compounds possess maxima at nearly identical wavelengths. Thus, paper chromatography and ultraviolet spectroscopy indicate positively that bis-4-hydroxy-3,5-dimethoxyphenylmethane is a product of the reaction of syringyl alcohol with alkali in aqueous solution. 

The maxima of the spectra of the eluted reference compound, diguaiacylmethane, and of the reaction product are located at almost identical wavelengths for both the neutral solvent and ionization Ac curve, as shown in Table VII. Furthermore, in both cases, the locations of the maxima of the ionization Ac curves agree well with the locations of the maxima of the ionization Ac curve of an ethanolic diguaiacylmethane solution (Table VII). Thus, paper chromatography and spectral analyses indicate that diguaiacylmethane is a product of the reaction of vanillyl alcohol with sodium hydroxide under aqueous reaction conditions. 

Taniguchi, et al. [99] have tested the one- and two-photon excitation for [Cr(acac)3]3- for several irradiation wavelengths but found no indication of a superlinear dependence of photoracemization or photodecomposition. This seems to be in line with the experiments of Gunde and Richardson [6] on Na3[Gd(02C-CH2-0-CH2-C02)3] 2NaC104 6H20 crystals. The possibility discussed in several papers [4-6] that in high-intensity radiation fields a pure electric dipole 2-photon absorption may lead to CD effects adds a new possibility of rationalization of the high-power laser results. 

Color contributed by textile and paper mills, tanneries, slaughterhouses, and other industries is an indicator of pollution. Compounds present in wastewaters absorb certain wavelength of light and reflect the remainder, a fact generally conceded to account for color development of streams. Color interferes with the transmission of sunlight into the stream and therefore lessens photosynthetic actions. 

---