頁籤選單縮合
題名 | Polarographic Study of Thallium(Ⅰ) Complexes with Large Crown Ethers in Binary Acetonitrile-Water Mixtures |
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作者姓名(外文) | Farhadi,Khalil; ShamsipurMojtaba; | 書刊名 | Journal of the Chinese Chemical Society |
卷期 | 46:6 1999.12[民88.12] |
頁次 | 頁893-898 |
分類號 | 346.146 |
關鍵詞 | 乙丢; 氰化甲烷; Tl狇 complexes; Large crowns; Mixed solvent; Stoichiometry; Stability; Polarography; |
語文 | 英文(English) |
英文摘要 | The complexation reactions between the Tl□ ion and large crown ethers dibenzo-30-crown-10 (DB30C10), dibenzo-27-crown-9 (DB27C9), dibenzo-24-crown-8 (DB24C8) and dibenzo-21-crown-7 (DB21C7) were studied in different acetonitrile- water mixtures at 25 ℃ using an a.c. polarographic technique. The stoichiometry and stability of the complexes were determined by monitoring the shift in peak potential of the polarographic waves of the metal ion against the crown concentration. In all solvent mixtures used, the stability of the resulting 1:1 complexes was found to vary in the order DC24C8>>DB30C10>DB21C7>DB27C9>DB24C8. There is an inverse relationship between the complex formation constants and the amount of water in the mixed solvent. In all cases, a linear relation was observed between log K□ and the mole fraction of acetonitrile in its mixtures with water. |
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