THERMODYNAMICS OF CAFFEINE AQUEOUS-SOLUTIONS
THERMODYNAMICS OF CAFFEINE AQUEOUS-SOLUTIONS
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DOI：
10.1021/j100544a026
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发表时间：
1976-01-01
影响因子：
--
通讯作者：
CRESCENZI, V
中科院分区：
文献类型：
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作者：
CESARO, A;RUSSO, E;CRESCENZI, V
根据量热法、蒸汽压渗透法、溶解度和密度实验，较完整地描述了咖啡因在较宽浓度范围内的热力学性质。整个数据集与根据溶质的多重缔合平衡考虑的性质的浓度依赖关系的解释是一致的。还报道了咖啡因与染料溴化乙锭在水溶液中形成络合物的数据。讨论了咖啡因自二聚和咖啡因-溴化乙锭加合物形成的热力学，并与几种已知在稀水溶液中通过“垂直堆积”进行二聚和/或聚集的不同物种的热力学进行了比较。
A rather complete description of the thermodynamic properties of caffeine in aqueous solution for a wide concentration range is afforded on the basis of calorimetry, vapor pressure osmometry, solubility, and den-sity experiments. The whole set of data is compatible with an interpretation of the concentration dependence of properties considered in terms of multiple association equilibria of the solute. Data on complex formation between caffeine and the dye ethidium bromide in aqueous solution are also reported. The ther-modynamics of caffeine self-dimerization as well as of the caffeine-ethidium bromide adduct formation is discussed and compared with that for a few different species known to dimerize and/or aggregate by “verti-cal stacking” in dilute aqueous solution.