| 钴(Ⅱ)-5-取代邻菲罗啉-α-氨基酸三元配合物的稳定性研究 |
| STUDIES ON THE STABILITY OF TERNARY COMPLEXES OF Co(Ⅱ)-5-SUBSTYTUTED PHENANTHROLINES-α-AMINOACIDS |
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| 摘要: 本文在25.0±0.1℃,I=0.1mol·dm-3KNO3存在下,采用pH法测得了5-取代邻菲罗啉的质子化常数以及钴(Ⅱ)与5-取代邻菲罗啉、α-氨基酸的二元、三元配合物的稳定常数。结果表明三元配合物的稳定性与5-取代邻菲罗啉的质子化常数、取代基常数均存在直线自由能关系。并用三元配合物稳定性的表征值logKM、△logK,讨论了三元配合物的稳定性,发现钴(Ⅱ)与配体5-取代邻菲罗啉之间也存在着d-p反馈π键。该π健的强度对三元配合物稳定性有着显著影响。 |
| 关键词: 稳定常数 d-pm反馈π键 钴(Ⅱ) α-氨基酸 5-取代邻菲罗啉 |
| 基金项目: 国家自然科学基金 |
| Abstract: The stability constants of binary and ternary complexes of Co(Ⅱ)-5-Rphen-α-aminoacids were studied by pH titration method at 25.0±0.1℃, in the presense of 0.1mol·dm-3 KNO3. The protonation constants of ligands Rphen and the stability constants of binary and ternary complexes co(Ⅱ)-5-Rphen-α-aminoacids were determined.The results show that linear free energy relationships exist between the stability constants of ternary complexes and the protonation constants of ligands Rphen and the Hammett parameters of substituents of Rphen.The stability of ternary complexes were discussed in terms of logKM and △logK. It was found that the d-p back-donation π bonding may exist between Co(Ⅱ) and 5-Rphen. |
| Keywords: stability constant d-p hack-donation π bonding cobalt(Ⅱ) 5-substituted phenanthroline α-aminoacid |
| 投稿时间：1993-11-20 |
| 摘要点击次数: 1894 |
| 全文下载次数: 1380 |
| 夏海涛,林华宽,陈荣悌.钴(Ⅱ)-5-取代邻菲罗啉-α-氨基酸三元配合物的稳定性研究[J].无机化学学报,1994,10(4):363-369. |
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