第 45 卷第 3 期 Vol. 45 No. 3 2015 年 6 月 Jun 2015

所属栏目：功能材料 手性Salen-Co配合物在纳米Silica和壳核纳米Silica上的接枝及环氧化催化性能的研究

周建波，曾 明，伏再辉，阳 科，崔小莹 （长沙医学院 基础医学系，湖南 长沙 410219）

摘　要：过共价键将手性Salen-Co（Ⅲ）配合物接枝到纳米Silica和壳-核纳米Silica表面上制备固相催化剂，并且用红外光谱（FT-IR）、热重分析（TG-DTA）、透射电镜等表征手段对已制备的催化剂进行了表征，结果证实手性Salen-Co配合物成功接枝到了纳米Silica和壳-核纳米Silica表面。以反式二苯乙烯为反应底物，考察了所得固相催化剂的环氧化催化活性、选择性、e.e.值（对映体过量）和重复使用性能，从催化结果来看所得固相催化剂有一定的不对称催化活性，重复使用性能也比较好。

关键词：Salen-Co（Ⅲ）；接枝；纳米Silica；壳-核纳米Silica

中图分类号：TQ426.6　　文献标识码：A　　文章编号：1009-9212（2015）03-0042-06

The Catalytic Epoxidation of Olefins Using Chiral Salen-Co Complexes Grafted Nano-silicas

ZHOU Jian-bo, ZENG Ming, FU Zai-hui, YANG Ke, CUI Xiao-ying (Changsha Medical University of Basic Medical System, Changsha 410219, China)

Abstract：The chiral salen-Co complexes were grafted onto nano-silica and core-shell nano-silica by covalent bond; TG-DTA, FT-IR, and transmission electron microscopy were used for characterization of the immobilized salen complexes. The results confirmed that the chiral salen-Co complexes were successfully attached to the surfaces of nano-silica and the core-shell nano-silica. The catalytic activity, selectivity and e.e% were also evaluated using the catalytic epoxidation reaction of E-stilbene. It was found that the immobilized catalysts showed higher conversion and better selectivity of E-stilbene. The heterogeneous catalysts after epoxidation could be recycled without significant loss of activity. These indicated that the chiral salen-Co complexes have been steadily bonded onto the nano-silica by covalent bond.

Key words：salen-Co(Ⅲ); graft; nano-silica; core-shell nano-silica

基金项目： 湖南省教育厅基金资助项目（13C0455），湖南省科技厅科技计划项目 （2014SK3025）。

作者简介： 周建波（1979-），女，湖南衡阳人，讲师，主要从事不对称催化合成（E-mail：229530464@qq.com）。

收稿日期： 2015-04-3