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瓜环—金属配合物超分子体系对BNPP水解催化性能考察

【作者】 白翠改

【导师】 陶朱;

【作者基本信息】 贵州大学 , 物理化学, 2008, 硕士

【摘要】 合成了N,N’-二(2-羟基苯甲基)乙二胺二水合Cu(Ⅱ)配合物(g),利用红外吸收光谱法、热重分析法、紫外吸收光谱法考察了六元瓜环与N,N’-二(2-羟基苯甲基)乙二胺二水合Cu(Ⅱ)配合物的相互作用及其对磷酸二酯(BNPP)的催化水解研究。研究结果表明:六元瓜环(Q[6])能与N,N’-二(2-羟基苯甲基)乙二胺二水合Cu(Ⅱ)配合物相互作用形成包结比为2:1的主客体包结物;BNPP以Q[6]~g为催化剂的水解的速率常数为2.34×10-4S-1是BNPP自身水解的速率常数1.12×10-11S-1的107倍,催化能力较强。选择[Co(N3)(N2)Cl][ZnCl4]体系为客体(N3=三元胺,N2=二元胺),体系包括以下几种客体:[Co(2,3-tri)(cmen)Cl](g1)、[Co(3,3-tri)(cmen)Cl](g2)、[Co(2,3-tri)(amp)Cl](g3)、[Co(3,3-tri)(amp)Cl](g4)。利用紫外-可见光谱法和红外光谱法研究了Q[8]与这四种化合物相互作用的情况,并计算出了平衡常数;利用动力学研究了Q[8]与这四种化合物对BNPP的催化水解情况,并计算出水解速率和转化率。研究结果表明:Q[8]与g1、g2、g3、g4相互作用形成物质的量比为1:1的超分子结构,形成的包结稳定常数在104~107 L·mol-1范围;Q[8]与上述客体有不同强弱的相互作用,Q[8]与客体的作用受客体中三元胺配体的影响,三元胺配体中碳链越长越易与Q[8]作用,Q[8]与客体的作用又受客体中二元胺配体中吡啶基的影响,含吡啶基的配体与Q[8]作用强度小;Q[8]~gn(n=1,2,3,4)催化BNPP水解的速率常数七数量级为10-6是BNPP自身水解的速率常数1.12×10-11S-1的105倍,催化能力较强。

【Abstract】 The complex, [Cu(N,N’-Bis (2-hydroxy-benzyl)(en))·2H2O], has been synthesized and characterized, and the interaction of cucurbit[6]uril with the above complex guest (g) has been investigated by using ultraviolet spectrophotometry, infrared spectroscopy and thermogravimetry analysis . The experimental results revealed that the interaction of Q[6] and guest has been in the ratio of 2:1. Also the host-guest system of Q[6]-g can catalyze BNPP hydrolysis, and the hydrolysis kinetics in presence of Q[6]-g is far more fast than in absence of catalysts,its rate constant is 2.34×10-4 S-1The interaction of cucurbit[8]uril host with [Co(N3) (N2)C1][ZnCl4] guests such as [Co(2,3-tri)(cmen)Cl][ZnCl4] (g1), [Co(3,3-tri) (cmen)Cl][ZnCl4] (g2), [Co(2,3-tri)(amp)Cl][ZnCl4] (g3), [Co(3,3-tri)(amp)Cl][ZnCl4] (g4) have been investigated by ultraviolet absorption spectroscopy, infrared spectroscopy. The experimental results of molar ratio and job methods revealed that the interactions of Q[8] and guests have been in the ratio of 1:1 respectively, and the assiocation constant have been found in the range from 104 L·mol-1 to 107 L·mol-1. Stabilities of cucurbit[8]uril with [Co(N3) (N2)Cl][ZnCl4] have been effected by the structures of the ligands of N3 and N2, more the number of carbon in N3 is, assiocation constant is larger, however, the group of pyridine resulted in the weaker Stability. Moreover, the host-guest system of Q[8]-gn can catalyze BNPP hydrolysis, and the hydrolysis kinetics in presence of Q[8]-gn is far more fast than in absence of supramolecular catalyst.

  • 【网络出版投稿人】 贵州大学
  • 【网络出版年期】2009年 02期
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