塩基性染料(C. I. Basic Blue 9およびC. I. Basic Violet 10)の集合におよぼす無機電解質の影響

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タイトル別名
  • THE EFFECT OF ELECTROLYTES ON THE AGGREGATION OF BASIC DYES (C. I. BASIC BLUE 9 AND C. I. BASIC VIOLET 10)
  • エンキセイ センリョウ C.I.Basic Blue 9 オヨビ C.I.Basic Violet 10 ノ シュウゴウ ニ オヨボス ムキ デンカイシツ ノ エイキョウ

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It is known that in addition to the van der Waals force the hydrophobic bond plays an important role in the aggregation of basic dye.<br>In this paper the effect of electrolytes on the dye aggregation is treated spectrophotometrically to investigate in more detail the role of hydrophobic bond in the aggregation of C. I. Basic Blue 9 and C. I. Basic Violet 10. Thermodynamic consideration indicated that the aggregation is mainly enthalpic for the former dye and is mainly entropic for the latter. Thus it is assumed that the hydrophobic bond is more responsible for the aggregation of C. I. Basic Violet 10. Following results were obtained on the aggregation of these dyes in presence of electrolytes.<br>These dyes in presence of electrolytes.<br>1) The effect of electrolytes on the aggregation of C. I. Basic Violet 10 increases in the order: The effect of these anions is greater than that of the cations.<br>2) The aggregation of C. I. Basic Violet 10 in presence of the electrolyte decreases with rise in temperature.<br>3) The amount of the dimer of C. I. Basic Violet 10, assumed to aggregate mainly by the hydrophobic bond, increases in presence of the electrolyte.<br>The aggregation is explained by two factors; one is the electrostatic neutralization of the charge of the dye cation by the ionic atmosphere and the other is the decrease in the hydration of the polar groups in the dye by the hydration of electrolyte ions. Since there is no change in the spectrum, the ion pair is not formed even when the amount of the counter ion is increased. This indicates that the hydrophobic bond causes the aggregation in presence of the electrolyte.<br>On the contraly, C. I. Basic Blue 9, assumed to aggregate mainly by van der Waals force, forms dimer and higher aggregates in presence of electrolytes, and the ion pair is formed at higher concentration of electrolyte. In short, spectral change of the dye indicates that dimerization takes place in dilute solution of electrolyte, as in the case of C. I. Basic Violet 10, and that the higher aggregates are formed and the interaction occures between the dye ion and the counter ion in concentrated solution.

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  • 繊維学会誌

    繊維学会誌 27 (12), 525-532, 1971

    社団法人 繊維学会

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