頁籤選單縮合
題名 | Acid Catalyzed Dissociation of 4-Aminopyridine Complex of Pentacyanoferrate (Ⅱ)= |
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作者 | 陳美玲; 葉玉堂; Chen, Mei-ling; Yeh, Andrew; |
期刊 | Journal of the Chinese Chemical Society |
出版日期 | 20011000 |
卷期 | 48:5 2001.10[民90.10] |
頁次 | 頁849-853 |
分類號 | 346.034 |
語文 | eng |
關鍵詞 | Acid catalysis; Dissociation kinetics; |
英文摘要 | Fe(CN)5ampy3- (ampy = 4-aminopyridine) complex was unstable at pH £ 4 with respect to the dissociation due to the protonations of the complex. The first protonation on the 4-aminopyridine ligand at pKa = 3.2 resulted in a @ 150-fold increase in rate of dissociation as compared to that of the complex in the neutral solution. However, further protonation of the complex on the cyanide ligand at pKa = 1.5 increased the rate only slightly. The large increase in the rate constant of dissociation for Fe(CN)5ampyH2- complex suggests that in the transition state the proton is likely shifted from the amino group and becomes coordinated to a pair of dp electrons directed at the face of the coordinated octahedron. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。