分散染料とアルキル硫酸エステル塩との相互作用に対する染料構造の影響

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タイトル別名
  • THE EFFECT OF THE CONSTITUTION OF THE DYE ON THE DEGREE OF INTERACTION BETWEEN DISPERSE DYES AND SODIUM ALKYL SULFATES
  • ブンサン センリョウ ト アルキル リュウサン エステルエン ト ノ ソウゴ サヨウ ニ タイスル センリョウ コウゾウ ノ エイキョウ ブンサン センリョウ ノ センショクセイ ニ カンスル ケンキュウ 3

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抄録

The interaction between disperse dyes and sodium alkyl sulfates in aqueous solution was studied spectrophotometrically. It was observed that the absorption spectra of the azo and the anthraquinone dye in aq. solution varied by adding sodium alkyl sulfate whose concentration was smaller than the cmc. These spectral change were attributed to the exothermal formation of 1:1 complex between the dye and sodium alkyl sulfate. The formation constants of the complex were determined at various temperature using Scott's equation, and the thermodynamic parameters were calculated.<br>Then, the basicities of the azo dyes having following structure were determined by means of optical method. The introduction of an electron-repelling substituent into the X position increased the basicity. On the other hand, the introduction of both the electron-repelling and the electron-withdrawing substituents into the Y position reduced the basicity. This result supports the idea proposed by E. Sawicki12, 13) and E. Haselbach14) that the proton addition to azo group takes place on the β nitrogen, and it is hindered sterically by a bulky substituent on the Y position. It was found that there is a good correlation between the pKa of the azo dye and the free energy change of the comlex formation. The spectral change of the azo dye in aq. solution accompanied with the protonation on the β nitrogen was similar to that of the azo dye accompanied by the complex formation. These results suggest that the lone pair electron on the β nitrogen plays an important role in the complex formation.<br>The absorption spectrum of the complex formed between the anthraquinone dye and sodium alkyl sulfate was similar to that of the dye in nonpolar environment. This fact suggests that there is a hydrophobic interaction between the anthraquinone dye and the sodium alkyl sulfate in the complex formation. The thermodynamic parameters indicate that the contribution of the hydrohobic interaction in this case is smaller than in the case of the azo dye.

収録刊行物

  • 繊維学会誌

    繊維学会誌 29 (1), T1-T7, 1973

    社団法人 繊維学会

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