THE STATE OF AGGREGATION OF METHYL-ORANGE IN WATER
THE STATE OF AGGREGATION OF METHYL-ORANGE IN WATER
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DOI：
10.1007/bf00646118
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发表时间：
1987-04-01
影响因子：
1.2
通讯作者：
GILKERSON, WR
中科院分区：
文献类型：
--
作者：
KENDRICK, KL;GILKERSON, WR
在 25°C 下测量了甲基橙、4-(4'-二甲基氨基苯基重氮基)-苯基磺酸钠水溶液的电导率、紫外可见吸光度和渗透系数。从这些量作为浓度函数的行为可以得出结论，甲基橙阴离子在高于 0.2 mM 时几乎完全二聚，并在高于 1 mM 时进一步聚集。将甲基橙水溶液在 50 和 60°C 下的渗透系数的文献值与单体-二聚体平衡产生的二聚体形成常数 Kd 值进行拟合。外推至 25°C 得出该温度下 Kd=9200 的估计值。该结果与此处提供的 25°C 时的电导数据一致。
The electrical conductances, UV-visible absorbances, and osmotic coefficients of aqueous solutions of methyl orange, sodium 4-(4′-dimethylaminophenyldiazo)-phenylsulfonate, have been measured at 25°C. From the behavior of these quantities as a function of concentration it is concluded that the methyl orange anion is almost completely dimerized above 0.2 mM and undergoes further aggregation above 1 mM. Literature values of the osmotic coefficients of aqueous methyl orange at 50 and 60°C are fitted to the monomer-dimer equilibrium yielding values of the dimer formation constant, Kd. Extrapolation to 25°C yields an estimate of Kd=9200 at this temperature. This result is shown to be consistent with the conductance data at 25°C presented here.