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利用（经分光光度法实现的）相溶解法测定了稀水溶液中β－环糊精（β－ CD）对偶氮苯的增溶等温线，从而求出了 1： 1配合物形成过程的热力学函数（ k0,△ rG0,△ rH0,△ rS0） .结果表明 :β－ CD能明显提高偶氮苯在水中的溶解度，并且随着β－ CD的浓度增加，偶氮苯在水中的溶解度线性增大 .这是因为 1： 1配合物的稳定常数相当大，偶氮苯在纯水中的溶解热是 26.18kJ/mol，从固相偶氮苯直接变成配合物的过程则放出热量 4.22kJ/mol.所以β－ CD和偶氮苯的配合过程是焓驱动过程 .
The solubilization isotherms of β-cyclodextrin (β-CD) to azobenzene in dilute aqueous solution were determined by the phase-resolved method (spectrophotometrically), and the thermodynamic function of the 1: 1 complex formation was obtained (K0, △ rG0, △ rH0, △ rS0) .The results showed that: β-CD can significantly increase the solubility of azobenzene in water, and the solubility of azobenzene in water increases linearly with the increase of β-CD concentration . This is because the stability constant of the 1: 1 complex is quite large, the heat of dissolution of azobenzene in pure water is 26.18 kJ / mol, and the conversion from the solid azobenzene directly into the complex gives off heat of 4.22 kJ / mol. Therefore, the coordination between β-CD and azobenzene is the enthalpy driving process.