頁籤選單縮合
題名 | Nuclear Magnetic Resonance Study of the Stoichiometry and Stability of Several Li狇-Crown Ether Complexes in Various Acetonitrile-Nitrobenzene Mixtures= |
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作者 | Karkhaneei,Ebrahim; Zebrajadian,Mohammad Hasan; Shamsipur,Mojtaba; |
期刊 | Journal of the Chinese Chemical Society |
出版日期 | 20010800 |
卷期 | 48:4 2001.08[民90.08] |
頁次 | 頁727-731 |
分類號 | 343.386 |
語文 | eng |
關鍵詞 | 脉Li NMR; Li狇-crown; Mixed solvent; Stoichiometry; Stability; |
英文摘要 | Lithium-7 NMR spectrometry was used to study the complexation reaction between lithium ions and several 12-, 15- and 18-membered crown ethers in a number of binary acetonitrile-nitrobenzene mixtures. Formation constants of the resulting 1:1 complexes in different solvent mixtures were determined by computer fitting of the chemical shift-mole ratio data. There is an inverse relationship between the complex stability and the amount of acetonitrile in the mixed solvent. Among different sized crown ethers used, 15-crowns were found to form the most stable Li+ complexes in the series. The influence of substitution on the macrocyclic rings on the stability of the resulting complexes is discussed. |
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