ABSTRACT

The present work reports the experimental densities ρ and ultrasonic speeds u of binary mixtures of 2-dimethylaminoethanol (2-DMAE) and 2-diethylaminoethanol (2-DEAE) with water at temperatures 293.15, 303.15 and 313.15 K over the entire composition range. Excess molar volume $V^E$, excess ultrasonic speed u^E, excess isentropic compressibility ${\kappa }_{\mathrm{s}}^{\mathrm{E}}$, excess intermolecular free-length $L_f^E$ and excess molar isentropic compression $K_{\mathrm{s},\mathrm{m}}^{\mathrm{E}}$ were calculated using the experimental data. The variations of excess parameters are modelled by the Redlich-Kister polynomial equation rendering strong deviations from ideality. The excess partial molar compressions ${\bar{K}}_{s,m,1}^E$ and ${\bar{K}}_{s,m,2}^E$, excess partial molar compressions at infinite dilution ${\bar{K}}_{s,m,1}^{0E}$ and ${\bar{K}}_{s,m,2}^{0E}$ expose about the structural configuration and molecular bonding in the aqueous binary system. The consequences of aqueous 2-DMAE/2-DEAE system may become a driving force for hydrophobic hydration to support solute-solvent hydrophilic interaction. The pattern and position of FT-IR spectra (recorded at room temperature 293.15 K) was consistent with the variations of excess parameters.

摘要

目前的工作报告了2-二甲氨基乙醇 (2-DMAE) 和 2-二乙氨基乙醇 (2-DEAE) 与水在温度 293.15、303.15 和 313.15 K 下在整个组成范围内的二元混合物的实验密度ρ和超声速度u 。过量摩尔体积${五}^{乙}$, 超音速u ^E , 超等熵压缩率${\kappa }_{\mathrm{s}}^{\mathrm{乙}}$, 过量的分子间自由长度 ${\mathrm{大号}}_F^{乙}$ 和过量的摩尔等熵压缩 ${ķ}_{\mathrm{s},\mathrm{米}}^{\mathrm{乙}}$使用实验数据计算。过量参数的变化由 Redlich-Kister 多项式方程建模，呈现与理想状态的强烈偏差。过度的部分磨牙压缩${\overline{ķ}}_{s,米,1}^{乙}$ 和 ${\overline{ķ}}_{s,米,2}^{乙}$, 在无限稀释时过度的部分摩尔压缩 ${\overline{ķ}}_{s,米,1}^{0乙}$ 和 ${\overline{ķ}}_{s,米,2}^{0乙}$揭示水性二元体系中的结构构型和分子键合。水性 2-DMAE/2-DEAE 系统的结果可能成为疏水水合的驱动力，以支持溶质-溶剂亲水相互作用。FT-IR 光谱的模式和位置​​（在室温 293.15 K 下记录）与过量参数的变化一致。