| 基于三角架配体的硝酸钴配合物的酯催化水解动力学与机理研究 |
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| 引用本文： | 王修光,杜淼,赵小军.基于三角架配体的硝酸钴配合物的酯催化水解动力学与机理研究[J].天津师范大学学报(自然科学版),2006,26(2):6-10. |
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| 作者姓名： | 王修光 杜淼 赵小军 |
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| 作者单位： | 天津师范大学,化学与生命科学学院,天津,300074 |
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| 摘 要： | 利用三脚架配体-钴(Ⅱ)配合物作为催化剂进行了水解催化4-硝基苯酚醋酸酯(NA)的研究.在pH7.5-9.4范围生成钴(Ⅱ)金属配合物(配体∶钴离子=1∶3),在25℃和不同的pH值条件下(pH7.5-9.4),通过观察4-硝基苯酚的释放速率研究了钴配合物催化4-硝基苯酚醋酸酯的水解反应动力学.结果表明,钴(Ⅱ)配合物可以作为有效的亲核试剂催化NA酯水解,水解速率v=(koMbsLML] kOHOH-] k0)NA],二级水解速率常数为0.197 mol-1.dm3.s-1.
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| 关 键 词： | 动力学 催化水解 金属酶 三脚架配体 钴(Ⅱ)配合物 cobalt(Ⅱ) complex |
| 文章编号： | 1671-1114(2006)02-0006-04 |
| 修稿时间： | 2005年12月20 |
Kinetics and Mechanism Study of the Catalytic Carboxyester Hydrolysis Using CoⅡ Nitrate with a Tripod Ligand 1,3,5-Tri- (N-α-Pyridylmethylenic Aminomethylenic) Benzene |
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| WANG Xiu-guang,DU Miao,ZHAO Xiao-jun.Kinetics and Mechanism Study of the Catalytic Carboxyester Hydrolysis Using CoⅡ Nitrate with a Tripod Ligand 1,3,5-Tri- (N-α-Pyridylmethylenic Aminomethylenic) Benzene[J].Journal of Tianjin Normal University(Natural Science Edition),2006,26(2):6-10. |
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| Authors: | WANG Xiu-guang DU Miao ZHAO Xiao-jun |
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| Abstract: | The CoⅡ complex with a tripod ligand (L) has been examined as a catalyst for the hydrolysis of 4-nitrophenyl acetate (NA) ester, which was investigated kinetically by observing the rates of the release of p-nitrophenol in the buffers at 25 ℃ and different pH values. The ligand forms a 1: 3(L:Co) complex in the pH range of 7.5-9.4. The kinetic studies have been perand pH 7.5-9.4. The results show that the CoⅡ complex serves as a good nucleophile that effectively catalyzes NA hydrolysis. The hydrolysis rate follows the law v= (kobsMLML]+kOHOH-]+k0) NA]. The second order hydrolysis rate constant using Co3LH-1is 0.197 mol-1·dm3·s-1. |
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| Keywords: | kinetics catalytic hydrolysis metalloenzyme tripod ligand |
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