Coloration of Oil Soluble Azo Dye due to Polymorphism of Sodium Alkyl Sulfates
1986 Volume 35 Issue 11 Pages 958-960
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1986 Volume 35 Issue 11 Pages 958-960
The effects of the crystal structure of a surfactant on the coloration of azo oil dyes were studied and found to depend on the kinds of auxochrome in the dye molecule and hydrophilic groups and alkyl chain length in the surfactant molecule.
In particular, when crystals of sodium alkyl (tetradecyl, hexadecyl and octadecyl) sulfates were precipitated at room temperature, they interacted with the azo oil dye having an amino group at the 4-position of naphthalene. The maximal absorption of the crystals had a specific wavelength (610nm), possibly due to the polymorphism of the sodium alkyl sulfates.
