Alumina-supported Mn(II), Co(II), Ni(II) and Cu(II) N, N-bis(salicylidene)-2,2-dimethylpropane-1,3-diamine complexes: Synthesis, characterization and catalytic oxidation of cyclohexene with tert-butylhydroperoxide and hydrogen peroxide
New square-planar manganese(II), copper(II), nickel(II) and cobalt(II) complexes of a tetradentate Schiff-base ligand “ N, N-bis(salicylidene)-2,2-dimethylpropane-1,3-diamine, H 2[salpnMe 2]” have been prepared and characterized by elemental analyses, IR, UV–Vis, conductometric and magnetic measurem...
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Published in | Catalysis communications Vol. 7; no. 12; pp. 955 - 962 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
AMSTERDAM
Elsevier B.V
01.12.2006
Elsevier |
Subjects | |
Online Access | Get full text |
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Summary: | New square-planar manganese(II), copper(II), nickel(II) and cobalt(II) complexes of a tetradentate Schiff-base ligand “
N,
N-bis(salicylidene)-2,2-dimethylpropane-1,3-diamine, H
2[salpnMe
2]” have been prepared and characterized by elemental analyses, IR, UV–Vis, conductometric and magnetic measurements. The results suggest that the symmetrical Schiff-base is a bivalent anion with tetradentate N
2O
2 donors derived from the phenolic oxygen and azomethine nitrogen. The formulae was found to be [M(salpnMe
2)] for the 1:1 non-electrolytic complexes. Alumina-supported metal complexes (ASMC; [M(salpnMe
2)/Al
2O
3]) catalyze the oxidation of cyclohexene with
tert-buthylhydroperoxide (TBHP) and hydrogen peroxide. Oxidation of cyclohexene with TBHP gave 2-cyclohexene-1-one, 2-cyclohexene-1-ol and 1-(
tert-butylperoxy)-2-cyclohexene whereas, oxidation with H
2O
2 resulted in the formation of cyclohexene oxide and cyclohexene-1,2-diol. Manganese(II) complex supported on alumina “[Mn(salpnMe
2]–Al
2O
3” shows significantly higher catalytic activity than other catalysts. |
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ISSN: | 1566-7367 1873-3905 |
DOI: | 10.1016/j.catcom.2006.04.005 |