{"title":"酸性条件下铝离子与乙醇酸的络合反应","authors":"Mayumi Etou, Toshifumi Taketatsu, Yoshihiro Okaue, Takanori Inoue, Takushi Yokoyama","doi":"10.1007/s10953-023-01319-7","DOIUrl":null,"url":null,"abstract":"<div><p>The complexation between Al<sup>3+</sup> ([Al(H<sub>2</sub>O)<sub>6</sub>]<sup>3+</sup>) and glycolic acid (GA, C<sub>2</sub>H<sub>4</sub>O<sub>3</sub>) which has a carboxyl group and a hydroxyl group in a molecule was investigated under acidic condition using <sup>27</sup>Al NMR, <sup>13</sup>C NMR and ESI–MS techniques. The five peaks including a peak due to Al<sup>3+</sup> were observed in <sup>27</sup>Al NMR spectra for the mixed solution of Al<sup>3+</sup> and GA, suggesting the existence of at least four Al-GA complexes. The results of NMR and ESI–MS measurements revealed that GA and Al<sup>3+</sup> can form one monodentate complex (AlGA<sup>2+</sup>) and three bidentate complexes (AlGA<sup>+</sup>, AlGA<sub>2</sub><sup>−</sup>, and AlGA<sub>3</sub><sup>3−</sup>) complexes. From the deconvolution of <sup>27</sup>Al NMR spectra and <i>pK</i>a value of GA, the conditional formation constants (log<sub>10</sub> <i>K</i>) of each complex (GA/Al molar ratio of 25 in mixed solution) can be determined to be 0.94 (AlGA<sup>2+</sup>), − 0.96 (AlGA<sup>+</sup>), − 0.77 (AlGA<sub>2</sub><sup>−</sup>) and − 2.21 (AlGA<sub>3</sub><sup>3−</sup>), respectively. In addition, the overall formation constant of three bidentate complex at pH 3 was also calculated to be − 1.65.</p></div>","PeriodicalId":666,"journal":{"name":"Journal of Solution Chemistry","volume":null,"pages":null},"PeriodicalIF":1.4000,"publicationDate":"2023-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10953-023-01319-7.pdf","citationCount":"0","resultStr":"{\"title\":\"Complexation Between Aluminum Ion and Glycolic Acid Under Acidic Condition\",\"authors\":\"Mayumi Etou, Toshifumi Taketatsu, Yoshihiro Okaue, Takanori Inoue, Takushi Yokoyama\",\"doi\":\"10.1007/s10953-023-01319-7\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>The complexation between Al<sup>3+</sup> ([Al(H<sub>2</sub>O)<sub>6</sub>]<sup>3+</sup>) and glycolic acid (GA, C<sub>2</sub>H<sub>4</sub>O<sub>3</sub>) which has a carboxyl group and a hydroxyl group in a molecule was investigated under acidic condition using <sup>27</sup>Al NMR, <sup>13</sup>C NMR and ESI–MS techniques. The five peaks including a peak due to Al<sup>3+</sup> were observed in <sup>27</sup>Al NMR spectra for the mixed solution of Al<sup>3+</sup> and GA, suggesting the existence of at least four Al-GA complexes. The results of NMR and ESI–MS measurements revealed that GA and Al<sup>3+</sup> can form one monodentate complex (AlGA<sup>2+</sup>) and three bidentate complexes (AlGA<sup>+</sup>, AlGA<sub>2</sub><sup>−</sup>, and AlGA<sub>3</sub><sup>3−</sup>) complexes. From the deconvolution of <sup>27</sup>Al NMR spectra and <i>pK</i>a value of GA, the conditional formation constants (log<sub>10</sub> <i>K</i>) of each complex (GA/Al molar ratio of 25 in mixed solution) can be determined to be 0.94 (AlGA<sup>2+</sup>), − 0.96 (AlGA<sup>+</sup>), − 0.77 (AlGA<sub>2</sub><sup>−</sup>) and − 2.21 (AlGA<sub>3</sub><sup>3−</sup>), respectively. In addition, the overall formation constant of three bidentate complex at pH 3 was also calculated to be − 1.65.</p></div>\",\"PeriodicalId\":666,\"journal\":{\"name\":\"Journal of Solution Chemistry\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":1.4000,\"publicationDate\":\"2023-08-08\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://link.springer.com/content/pdf/10.1007/s10953-023-01319-7.pdf\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Solution Chemistry\",\"FirstCategoryId\":\"92\",\"ListUrlMain\":\"https://link.springer.com/article/10.1007/s10953-023-01319-7\",\"RegionNum\":4,\"RegionCategory\":\"化学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q4\",\"JCRName\":\"CHEMISTRY, PHYSICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Solution Chemistry","FirstCategoryId":"92","ListUrlMain":"https://link.springer.com/article/10.1007/s10953-023-01319-7","RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
Complexation Between Aluminum Ion and Glycolic Acid Under Acidic Condition
The complexation between Al3+ ([Al(H2O)6]3+) and glycolic acid (GA, C2H4O3) which has a carboxyl group and a hydroxyl group in a molecule was investigated under acidic condition using 27Al NMR, 13C NMR and ESI–MS techniques. The five peaks including a peak due to Al3+ were observed in 27Al NMR spectra for the mixed solution of Al3+ and GA, suggesting the existence of at least four Al-GA complexes. The results of NMR and ESI–MS measurements revealed that GA and Al3+ can form one monodentate complex (AlGA2+) and three bidentate complexes (AlGA+, AlGA2−, and AlGA33−) complexes. From the deconvolution of 27Al NMR spectra and pKa value of GA, the conditional formation constants (log10K) of each complex (GA/Al molar ratio of 25 in mixed solution) can be determined to be 0.94 (AlGA2+), − 0.96 (AlGA+), − 0.77 (AlGA2−) and − 2.21 (AlGA33−), respectively. In addition, the overall formation constant of three bidentate complex at pH 3 was also calculated to be − 1.65.
期刊介绍：
Journal of Solution Chemistry offers a forum for research on the physical chemistry of liquid solutions in such fields as physical chemistry, chemical physics, molecular biology, statistical mechanics, biochemistry, and biophysics. The emphasis is on papers in which the solvent plays a dominant rather than incidental role. Featured topics include experimental investigations of the dielectric, spectroscopic, thermodynamic, transport, or relaxation properties of both electrolytes and nonelectrolytes in liquid solutions.
京公网安备 11010802042870号
京ICP备2023020795号-1
分享
求助内容：
应助结果提醒方式：
扫码关注我们
