A highly-efficient and environmental-friendly method for the preparation of Mn(III)–Salen complexes encapsulated HMS by using microwave irradiation

• DOI: 10.1016/j.micromeso.2007.01.059
• Publication Date: 2007-02-23T16:36:58Z
• Authors: Zaihui Fu; Huiying Liao; Donglu Xiong; Zehui Zhang; Yan Jiang; Dulin Yin
• Keywords: Environmentally Friendly

Abstract It was reported that the microwave-assisted in situ synthesis and encapsulation of Mn(III)–Salen complexes inside the pores of the amino-functionalized mesoporous silicas of HMS. The prepared heterogeneous Mn(III)–Salen complexes via this method were characterized by diffusion reflection UV–Vis, FT-IR, TG-DTA and N 2 volumetric adsorption, and their catalytic properties were checked with the epoxidation of trans -stilbene with iodobenzene diacetate. The results indicated that, in comparison with the traditional adsorption method, the microwave-assisted approach was efficient and environmental-friendly, and could improve the loadings of Mn(III)–Salen complexes on HMS via a strengthening axial coordination of the surface’s NH 2 groups of HMS toward the Mn(III)–Salen complexes. Furthermore, the encapsulation of Mn(III)–Salen complexes inside the host HMS could be rapidly achieved by the HMS’s porous outlets grafting a suitable molecular-size ester-terminated polyamidoester dendrimers under the microwave irradiation. As a result, the encapsulated Mn(III)–Salen complexes inside the HMS’s pores showed a lower leaching, better catalytic activity and reusability than the un-encapsulated counterparts in catalyzing the epoxidation of trans -stilbene.