Chinese Journal of Applied Chemistry

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Synthesis, Structure of an Iron(Ⅲ) Complex Containing N-Donor Ligand and Its Catalytic Activity for Cyclohexane Oxidation

XU Liting, XING Na*, WU Qiong, MA Xitong, XING Yongheng*   

  1. (College of Chemistry and Chemical Engineering,Liaoning Normal University,Dalian 116029,China)
  • Received:2013-09-03 Revised:2013-11-05 Published:2014-06-10 Online:2014-06-10

Abstract: One novel iron complex, [Fe(H2L)2]·(CH3COO)2·(OH)·H2O(H2L=2,6-di-(5-methyl-1H-pyrazol-3-yl)pyridine) with N-donor ligand 2,6-di-(5-methyl-1H-pyrazol-3-yl)pyridine, was synthesized and characterized by elemental analysis, powder X-ray diffraction(PXRD) and single-crystal X-ray diffraction. In addition, the catalytic activity of the complex to cyclohexane oxidation was examined. The effects of various reaction factors such as the amount of H2O2, HNO3 and water, reaction time, as well as the temperature on the formation and decomposition of cyclohexylhydroperoxide, and the yield of C6H10O and C6H11OH were evaluated. The mechanism of oxidation reaction was also discussed. It shows that H2O2 is the main oxidant for the oxidation of cyclohexane to C6H11OOH catalyzed by the titled Fe complex; HNO3 has no oxidizing effect on this process, but can accelerate the formation and decomposition rates of C6H11OOH. Water has an inhibition effect on the catalytic activity, thereby lowering the formation and decomposition rates of C6H11OOH. The formation rates of C6H11OOH and C6H10O(C6H11OH) are different at different reaction stages. Higher temperature can promote the decomposition of C6H11OOH, which benefits the formation of C6H10O and C6H11OH.

Key words: iron complex,di-(methy-1H-pyrazol-yl)pyridine, cyclohexane oxidation, cyclohexylhydroperoxide, reaction mechanism

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