化学
溶解度
摩尔分数
溶解
溶剂
焓
卟啉
吉布斯自由能
吸热过程
无机化学
物理化学
热力学
有机化学
吸附
物理
作者
Chunlin Li,Qinbo Wang,Binwei Shen,Zhenhua Xiong,Chuxiong Chen
标识
DOI:10.1021/acs.jced.5b00092
摘要
The mole fraction solubilities of 5,10,15,20-tetraphenylporphyrin (TPP) and 5,10,15,20-tetra(p-chlorophenyl)porphyrin (p-ClTPP) in binary system N,N-dimethylformamide (DMF) + water solvent mixtures were measured at atmospheric pressure by using the static method. The temperature and effects of mole fraction of DMF in the solvent mixtures on solubility were studied. The results show that the solubilities of TPP and p-ClTPP increase with the increasing temperature for a certain solvent composition, and the solubilities show a maximum in pure DMF, then the solubilities decrease when the water was added to the system. The experimental data were correlated with modified Apelblat equation. The solubilities calculated by the model were in good agreement with experimental observations. Thermodynamic parameters such as dissolution enthalpy, isobaric heat capacity and Gibbs energy were obtained from the solubility data by using the Clark–Glew equation together with the modified Apelblat equation. The result demonstrated that the dissolving process of TPP and p-ClTPP in DMF + water solvent mixtures is endothermic and not spontaneous.
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