{"title":"298.15 K下cdbr2 -l-脯氨酸（反式-4- oh -l-脯氨酸）-H2O平衡体系及其双盐标准摩尔生成焓的研究","authors":"Dong-qin Bi, Shu-han Li, Xue-jia Zhang, Zi-xiao Zhao, Qi-chao Yang* and Zhan-ping Qiao, ","doi":"10.1021/acs.jced.5c00319","DOIUrl":null,"url":null,"abstract":"<p >Two-phase equilibrium of ternary systems of CdBr<sub>2</sub>–<span>l</span>-proline/(4-OH-<span>l</span>-proline)–H<sub>2</sub>O at <i>T</i> = 298.15 K is studied. Their isothermal solution equilibrium phase diagrams have been drawn based on the solubility data. Two double salts (Cd(C<sub>5</sub>H<sub>9</sub>NO<sub>2</sub>)Br<sub>2</sub>·H<sub>2</sub>O and Cd(C<sub>5</sub>H<sub>9</sub>NO<sub>3</sub>)Br<sub>2</sub>) have been found by the Schrienemakers method in phase diagrams, and they are all congruently soluble in water. Both of them have been synthesized and characterized by powder XRD and TG-DTG. For the first time, enthalpies of solution of Cd(C<sub>5</sub>H<sub>9</sub>NO<sub>2</sub>)Br<sub>2</sub>·H<sub>2</sub>O and Cd(C<sub>5</sub>H<sub>9</sub>NO<sub>3</sub>)Br<sub>2</sub> are measured in water, and their standard molar enthalpies of formation at 298.15 K are calculated by designing thermochemical cycles according to the Hess law. By comparison, it is found that the region of infinite dissolution appears in the ternary system of CdBr<sub>2</sub>–<span>l</span>-proline–H<sub>2</sub>O at 298.15 K. If the composition of the solution is in this region, there is no crystal when the water evaporates and only a viscous mixture can be obtained.</p>","PeriodicalId":42,"journal":{"name":"Journal of Chemical & Engineering Data","volume":"70 8","pages":"3458–3466"},"PeriodicalIF":2.1000,"publicationDate":"2025-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"A Study on the Equilibrium System of CdBr2–l-Proline (trans-4-OH-l-Proline)–H2O at 298.15 K and the Standard Molar Enthalpies of Formation of Their Double Salts\",\"authors\":\"Dong-qin Bi, Shu-han Li, Xue-jia Zhang, Zi-xiao Zhao, Qi-chao Yang* and Zhan-ping Qiao, \",\"doi\":\"10.1021/acs.jced.5c00319\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p >Two-phase equilibrium of ternary systems of CdBr<sub>2</sub>–<span>l</span>-proline/(4-OH-<span>l</span>-proline)–H<sub>2</sub>O at <i>T</i> = 298.15 K is studied. Their isothermal solution equilibrium phase diagrams have been drawn based on the solubility data. Two double salts (Cd(C<sub>5</sub>H<sub>9</sub>NO<sub>2</sub>)Br<sub>2</sub>·H<sub>2</sub>O and Cd(C<sub>5</sub>H<sub>9</sub>NO<sub>3</sub>)Br<sub>2</sub>) have been found by the Schrienemakers method in phase diagrams, and they are all congruently soluble in water. Both of them have been synthesized and characterized by powder XRD and TG-DTG. For the first time, enthalpies of solution of Cd(C<sub>5</sub>H<sub>9</sub>NO<sub>2</sub>)Br<sub>2</sub>·H<sub>2</sub>O and Cd(C<sub>5</sub>H<sub>9</sub>NO<sub>3</sub>)Br<sub>2</sub> are measured in water, and their standard molar enthalpies of formation at 298.15 K are calculated by designing thermochemical cycles according to the Hess law. By comparison, it is found that the region of infinite dissolution appears in the ternary system of CdBr<sub>2</sub>–<span>l</span>-proline–H<sub>2</sub>O at 298.15 K. If the composition of the solution is in this region, there is no crystal when the water evaporates and only a viscous mixture can be obtained.</p>\",\"PeriodicalId\":42,\"journal\":{\"name\":\"Journal of Chemical & Engineering Data\",\"volume\":\"70 8\",\"pages\":\"3458–3466\"},\"PeriodicalIF\":2.1000,\"publicationDate\":\"2025-07-27\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Chemical & Engineering Data\",\"FirstCategoryId\":\"1\",\"ListUrlMain\":\"https://pubs.acs.org/doi/10.1021/acs.jced.5c00319\",\"RegionNum\":3,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"CHEMISTRY, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Chemical & Engineering Data","FirstCategoryId":"1","ListUrlMain":"https://pubs.acs.org/doi/10.1021/acs.jced.5c00319","RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
A Study on the Equilibrium System of CdBr2–l-Proline (trans-4-OH-l-Proline)–H2O at 298.15 K and the Standard Molar Enthalpies of Formation of Their Double Salts
Two-phase equilibrium of ternary systems of CdBr2–l-proline/(4-OH-l-proline)–H2O at T = 298.15 K is studied. Their isothermal solution equilibrium phase diagrams have been drawn based on the solubility data. Two double salts (Cd(C5H9NO2)Br2·H2O and Cd(C5H9NO3)Br2) have been found by the Schrienemakers method in phase diagrams, and they are all congruently soluble in water. Both of them have been synthesized and characterized by powder XRD and TG-DTG. For the first time, enthalpies of solution of Cd(C5H9NO2)Br2·H2O and Cd(C5H9NO3)Br2 are measured in water, and their standard molar enthalpies of formation at 298.15 K are calculated by designing thermochemical cycles according to the Hess law. By comparison, it is found that the region of infinite dissolution appears in the ternary system of CdBr2–l-proline–H2O at 298.15 K. If the composition of the solution is in this region, there is no crystal when the water evaporates and only a viscous mixture can be obtained.
期刊介绍：
The Journal of Chemical & Engineering Data is a monthly journal devoted to the publication of data obtained from both experiment and computation, which are viewed as complementary. It is the only American Chemical Society journal primarily concerned with articles containing data on the phase behavior and the physical, thermodynamic, and transport properties of well-defined materials, including complex mixtures of known compositions. While environmental and biological samples are of interest, their compositions must be known and reproducible. As a result, adsorption on natural product materials does not generally fit within the scope of Journal of Chemical & Engineering Data.
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