个人信息Personal Information
教授
博士生导师
硕士生导师
性别:男
毕业院校:南京大学
学位:博士
所在单位:化工学院
电子邮箱:hecheng@dlut.edu.cn
A thiourea-functionalized metal-organic macrocycle for the catalysis of Michael additions and prominent size-selective effect
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论文类型:期刊论文
发表时间:2017-03-28
发表刊物:DALTON TRANSACTIONS
收录刊物:SCIE、EI、PubMed
卷号:46
期号:12
页面范围:4086-4092
ISSN号:1477-9226
摘要:A discrete tetranuclear thiourea-based metal-organic macrocycle (MOM) with a large size was constructed by a well-designed organic ligand and nickel(II) ions via self-assembly. Incorporating thiourea groups as hydrogen-bond donors into a metal-organic complex system leads to a new approach for synthesizing functionalized heterogeneous catalysts, as this not only introduces coordination sites serving as chelators, but also overcomes the issues of self-association via intermolecular H-bonding, often occurring in homogeneous systems. The packing structure of this material formed a confined environment suitable for the access of substrate molecules dragged by the strong hydrogen-bond interactions from the thiourea groups, thus achieving a high catalytic performance in Michael additions of nitrostyrenes to nitroalkanes, with remarkable yields and size-selectivity in heterogeneous phase. Moreover, a comparison of the IR spectrum of Ni-SPT with the spectra of dimethyl malonate-and beta-nitrostyreneimpregnated Ni-SPT indicated that both substrate molecules, beta-nitrostyrene and dimethyl malonate, were able to access the cavity of the trimeric subunit.