期刊
JOURNAL OF COORDINATION CHEMISTRY
卷 64, 期 10, 页码 1837-1847出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/00958972.2011.582582
关键词
Immobilization; Heterogeneous catalyst; Ni(II) Schiff-base complex; Oxidation; Montmorillonite
资金
- Research Council of Mohaghegh-e-Ardabili University
Nickel(II) tetradentate Schiff-base complexes of N,N'-(bis(pyridin-2-yl)formylidene) ethane-1,2-diamine (L1), N,N'-(bis(pyridin-2-yl)formylidene)cyclohexane-1,2-diamine (L2), N,N'-(bis(pyridin-2-yl)formylidene)benzene-1,2-diamine (L3), N,N'-(bis(pyridin-2-yl)formylidene)meso-stilben-1,2-diamine (L4), and N,N'-(bis(pyridin-2-yl)formylidene)propane-1,3-diamine (L5) were synthesized, characterized, and immobilized on sodium montmorillonite. The complexes were characterized by IR spectroscopy, diffuse reflectance spectra (DRS), and atomic absorption spectroscopy (AAS). IR and DRS data of the heterogeneous catalysts show that the Ni(II) complexes were physically entrapped within the sodium montmorillonite clay. The supported complexes show good catalytic activity for the epoxidation of cyclooctene using tert-butylhydroperoxide (TBHP) as oxygen source in acetonitrile. The Ni-catalyzed oxidation proceeds with 62.3% selectivity for epoxidation with 69% conversion for supported [Ni(L5)].
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