Acta Phys. -Chim. Sin. ›› 2010, Vol. 26 ›› Issue (07): 1860-1866.doi: 10.3866/PKU.WHXB20100707

• CATALYSIS AND SURFACE STRUCTURE • Previous Articles     Next Articles

Catalytic Activity of an Oxime Carbapalladacycle Complex Grafted onto Superparamagnetically Mesoporous Nanoparticles for the Heck Reaction

SHEN Bin, WANG Yong-An, WANG Zhi-Fei, ZHANG Ling   

  1. School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, P. R. China
  • Received:2010-01-28 Revised:2010-03-23 Published:2010-07-02
  • Contact: SHEN Bin E-mail:binshen2000@hotmail.com

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Abstract:

A mesoporous SiO2@Fe3O4 nanocomposite was prepared by the sol-gel method. The nanocomposite was modified with a thiol and then a long carbon chain oxime carbapalladacycle complex as grafted by a—SCH2— linkage. The catalyst was characterized by transmission electron microscopy (TEM), high resolution transmission electron microscopy (HRTEM), Fourier transform infrared (FT-IR) spectroscopy, N2 adsorption-desorption isotherms, X-ray photoelectron spectroscopy (XPS), and vibration samplemagnetometry (VSM). Its catalytic activity for the Heck coupling reaction was measured. The BET surface area of the support with a diameter of 150 nm was about 287.0 m2·g-1 and the average pore size was about 3.5 nm. The catalyst had superparamagnetic properties. In the Heck reaction of iodobenzene with ethyl acrylate, a high conversation of 99%was obtained after 2.5 h. The catalyst was reused 6 times without significant loss of activity (95%after the sixth run). The catalyst was easily dispersed in the reaction mixture and was separated swiftly by an added magnetic field.

Key words: Sol-gel method, Superparamagnetic, Mesoporous, Oxime carbapalladacycle, Supported catalyst, Heck reaction