Department of Physical Chemistry, Faculty of Chemistry, University of Lodz, Pomorska 163/165, 90-236 Lodz, Poland.
Department of Physical Chemistry, University of Split, Ruđera Boškovića 35, HR-21000 Split, Croatia.
Molecules. 2022 Jul 10;27(14):4420. doi: 10.3390/molecules27144420.
The electrical conductivities of aqueous solutions of sodium salts of -4-hydroxycinnamic acid (--coumaric acid), -3,4-dihydroxycinnamic acid (-caffeic acid), -4-hydroxy-3-methoxycinnamic acid, (-ferulic acid) and -3-phenylacrylic acid (-cinnamic acid) with α-cyclodextrin were measured in the temperature range of 288.15 K-318.15 K. For the first time in the literature, using the limiting molar conductivity (Λmo) obtained from conductivity measurements, the values of the complexation constants () of the salts of phenolic acid derivatives with α-cyclodextrin were determined using a modified low concentration chemical model (IcCM). An attempt was also made to analyze the individual thermodynamic functions ΔGo, ΔHo and ΔSo describing the complexation process as a function of temperature changes. The obtained results show that the process of formation of inclusion complexes is exothermic and is spontaneous.
测定了 -4-羟基肉桂酸钠（--香豆酸）、-3,4-二羟基肉桂酸钠（-咖啡酸）、-4-羟基-3-甲氧基肉桂酸钠、(-阿魏酸）和 -3-苯丙烯酸（-肉桂酸）在 α-环糊精水溶液中的电导率，温度范围为 288.15 K-318.15 K。首次使用电导率测量得到的极限摩尔电导率（Λmo），根据改进的低浓度化学模型（IcCM），确定了酚酸衍生物盐与 α-环糊精的配合常数（）的值。还试图分析作为温度变化函数的描述配合过程的单个热力学函数 ΔGo、ΔHo 和 ΔSo。得到的结果表明，形成包络复合物的过程是放热的，是自发的。
