Yahia Z. Hamada, Nabil Bayakly, M. Shafi, S. Painter, Vanessa Taylor, J. Greene, Khalid Rosli
{"title":"Cr3+与天冬氨酸在很宽的pH范围内的反应","authors":"Yahia Z. Hamada, Nabil Bayakly, M. Shafi, S. Painter, Vanessa Taylor, J. Greene, Khalid Rosli","doi":"10.1080/2164232X.2014.883291","DOIUrl":null,"url":null,"abstract":"Formation of the metal complexes of aspartic acid (Asp) with the chromium metal ion (Cr3+) in solutions using potentiometric titrations is presented within a wide pH range (∼3.5 to ∼10.5) at 25°C and I=0.10 M NaNO3. Concentration distribution diagrams revealed that the main complex formed within this pH range is the bis Cr 3+ complex. Literature stability constant values for the Cr–Asp complexes were used to construct concentration distribution diagrams. Complexes taken into consideration were the simple one-to-one complex, the bis-complex, and the bis-mono-protonated complex, namely, Cr–Asp, Cr(Asp)2, and Cr(Asp)2H. The corresponding Log β values of these complexes were 12.46, 21.86, and 24.30, respectively. UV–Vis spectra demonstrate Cr 3+–Asp binding. The UV–Vis spectra were collected from a system that reached a high level of equilibrium state (50 days’ equilibrium time).","PeriodicalId":10590,"journal":{"name":"Complex Metals","volume":"1 1","pages":"46 - 51"},"PeriodicalIF":0.0000,"publicationDate":"2014-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"4","resultStr":"{\"title\":\"Reactions of Cr3+ with aspartic acid within a wide pH range\",\"authors\":\"Yahia Z. Hamada, Nabil Bayakly, M. Shafi, S. Painter, Vanessa Taylor, J. Greene, Khalid Rosli\",\"doi\":\"10.1080/2164232X.2014.883291\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"Formation of the metal complexes of aspartic acid (Asp) with the chromium metal ion (Cr3+) in solutions using potentiometric titrations is presented within a wide pH range (∼3.5 to ∼10.5) at 25°C and I=0.10 M NaNO3. Concentration distribution diagrams revealed that the main complex formed within this pH range is the bis Cr 3+ complex. Literature stability constant values for the Cr–Asp complexes were used to construct concentration distribution diagrams. Complexes taken into consideration were the simple one-to-one complex, the bis-complex, and the bis-mono-protonated complex, namely, Cr–Asp, Cr(Asp)2, and Cr(Asp)2H. The corresponding Log β values of these complexes were 12.46, 21.86, and 24.30, respectively. UV–Vis spectra demonstrate Cr 3+–Asp binding. The UV–Vis spectra were collected from a system that reached a high level of equilibrium state (50 days’ equilibrium time).\",\"PeriodicalId\":10590,\"journal\":{\"name\":\"Complex Metals\",\"volume\":\"1 1\",\"pages\":\"46 - 51\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2014-03-17\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"4\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Complex Metals\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.1080/2164232X.2014.883291\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Complex Metals","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1080/2164232X.2014.883291","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
Reactions of Cr3+ with aspartic acid within a wide pH range
Formation of the metal complexes of aspartic acid (Asp) with the chromium metal ion (Cr3+) in solutions using potentiometric titrations is presented within a wide pH range (∼3.5 to ∼10.5) at 25°C and I=0.10 M NaNO3. Concentration distribution diagrams revealed that the main complex formed within this pH range is the bis Cr 3+ complex. Literature stability constant values for the Cr–Asp complexes were used to construct concentration distribution diagrams. Complexes taken into consideration were the simple one-to-one complex, the bis-complex, and the bis-mono-protonated complex, namely, Cr–Asp, Cr(Asp)2, and Cr(Asp)2H. The corresponding Log β values of these complexes were 12.46, 21.86, and 24.30, respectively. UV–Vis spectra demonstrate Cr 3+–Asp binding. The UV–Vis spectra were collected from a system that reached a high level of equilibrium state (50 days’ equilibrium time).