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Assessing the Temperature-Dependent Tunable Polarity of N,N-Dimethylcyclohexylamine (DMCHA) and Water Mixtures
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2022-03-09 , DOI: 10.1021/acssuschemeng.2c00293 Ryan T. Berry 1 , Elizabeth Dach 2 , Jessica A. Melhorn 1 , Ngai Yin Yip 2, 3 , Lindsay Soh 1
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2022-03-09 , DOI: 10.1021/acssuschemeng.2c00293 Ryan T. Berry 1 , Elizabeth Dach 2 , Jessica A. Melhorn 1 , Ngai Yin Yip 2, 3 , Lindsay Soh 1
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The promise of switchable solvents as green solvent alternatives lies in the ability to drastically alter their properties based on an external trigger. Switchable hydrophilicity solvent N,N-dimethylcyclohexylamine, DMCHA, is known to change properties based on both CO2 addition and variations in temperature, both in the presence of water. While the impact of temperature has been observed via changes in water solubility, the solvent properties underlying these observations have not been quantified. Kamlet–Taft solvatochromic parameters (α, β, and π*) and dielectric constants for DMCHA and DMCHA–water mixtures were measured across a temperature range of 25–60 °C. Temperature swing effects of DMCHA in addition to CO2-switching capabilities were validated and quantified on the Kamlet–Taft polarity scale. Notably, binary mixtures of water in DMCHA show promising tunability in terms of its β and π* parameters induced by moderate variations in temperature. Potential applications for this CO2-switchable and temperature-tunable solvent are discussed.
中文翻译：
评估 N,N-二甲基环己胺 (DMCHA) 和水混合物的温度依赖性可调极性
可切换溶剂作为绿色溶剂替代品的前景在于能够根据外部触发大幅改变其性质。已知可切换的亲水性溶剂N，N-二甲基环己胺 DMCHA在水存在的情况下会基于 CO 2添加和温度变化而改变性质。虽然已经通过水溶性的变化观察到温度的影响，但这些观察结果背后的溶剂特性尚未量化。在 25-60 °C 的温度范围内测量了 DMCHA 和 DMCHA-水混合物的 Kamlet-Taft 溶剂致变色参数（α、β 和 π*）和介电常数。除了 CO 2外，DMCHA 的温度波动效应- 切换能力在 Kamlet-Taft 极性量表上得到验证和量化。值得注意的是，DMCHA 中水的二元混合物在温度适度变化引起的 β 和 π* 参数方面显示出有希望的可调性。讨论了这种 CO 2可切换和温度可调溶剂的潜在应用。
更新日期：2022-03-09
中文翻译：
评估 N,N-二甲基环己胺 (DMCHA) 和水混合物的温度依赖性可调极性
可切换溶剂作为绿色溶剂替代品的前景在于能够根据外部触发大幅改变其性质。已知可切换的亲水性溶剂N，N-二甲基环己胺 DMCHA在水存在的情况下会基于 CO 2添加和温度变化而改变性质。虽然已经通过水溶性的变化观察到温度的影响，但这些观察结果背后的溶剂特性尚未量化。在 25-60 °C 的温度范围内测量了 DMCHA 和 DMCHA-水混合物的 Kamlet-Taft 溶剂致变色参数（α、β 和 π*）和介电常数。除了 CO 2外，DMCHA 的温度波动效应- 切换能力在 Kamlet-Taft 极性量表上得到验证和量化。值得注意的是，DMCHA 中水的二元混合物在温度适度变化引起的 β 和 π* 参数方面显示出有希望的可调性。讨论了这种 CO 2可切换和温度可调溶剂的潜在应用。
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