Host (nanocavity of zeolite-Y)/guest (Mn(II), Co(II), Ni(II) and Cu(II) complexes of pentadendate Schiff-base ligand) nanocomposite materials (HGNM): application in the heterogeneous oxidation of cyclohexene |
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Authors: | Masoud Salavati-Niasari Maryam Shaterian |
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Affiliation: | (1) Institute of Nano Science and Nano Technology, University of Kashan, P.O. Box 87317-51167, Kashan, Iran;(2) Department of Chemistry, University of Kashan, P.O. Box 87317-51167, Kashan, Iran |
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Abstract: | Transition metal (M = Mn(II), Co(II), Ni(II) and Cu(II)) complexes with pentadendate Schiff-base ligand; N,N′-bis(salicylidene)-2,6-pyridinediaminato,
H2 sal-2,6-py]; was entrapped in the nanocavity of zeolite-Y by a two-step process in the liquid phase: (i) adsorption of bis(salicylaldiminato)metal(II);
M(sal)2]-NaY; in the supercages of the zeolite, and (ii) in situ Schiff condensation of the metal(II) precursor complex with the
corresponding 2,6-pyridinediamine; M(sal-2,6-py)]-NaY. The new materials were characterised by several techniques: chemical
analysis, spectroscopic methods (DRS, BET, FTIR and UV/Vis), conductometric and magnetic measurements. Analysis of the data
indicates that the M(II) complexes are encapsulated in the nanodimensional pores of zeolite-Y and exhibit different from those
of the free complexes, which can arise from distortions caused by steric effects due to the presence of sodium cations, or
from interactions with the zeolite matrix. The Host–Guest Nanocomposite Materials (HGNM); M(sal-2,6-py)]-NaY; catalyzes the
oxidation of cyclohexene with tert-butylhydroperoxide (TBHP). Oxidation of cyclohexene with HGNM gave 2-cyclohexene-1-one, 2-cyclohexene-1-ol and 1-(tert-butylperoxy)-2-cyclohexene. Mn(sal-2,6-py)]-NaY shows significantly higher catalytic activity than other catalysts. |
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Keywords: | Schiff-base Zeolite Oxidation Cyclohexene Host– guest nanocomposite |
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