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A palladium(II) 4-hydroxysalicylidene Schiff-base complex anchored on functionalized MCM-41: An efficient heterogeneous catalyst for the epoxidation of olefins

Paper ID Volume ID Publish Year Pages File Format Full-Text
39502 45825 2014 12 PDF Available
Title
A palladium(II) 4-hydroxysalicylidene Schiff-base complex anchored on functionalized MCM-41: An efficient heterogeneous catalyst for the epoxidation of olefins
Abstract

•N-(3-(trimethoxysilyl)propylethylenediamine is anchored onto MCM-41 (MCM-41-N).•Condensation of 4-hydroxysalicylidene creates MCM-41-N-Hdhba Schiff-base.•Pd(II) complex of MCM-41-N-Hdhba is reported.•Catalytic epoxidation of olefins is achieved by Pd(II) complex.•Recovery of Pd(II) catalyst after several cycles is discussed.

Synthetic procedures are described for anchoring of N-(3-(trimethoxysilyl)-propylethylenediamine on the surface of the mesoporous silica, MCM-41 (MCM-41-N). The condensation of 4-hydroxysalicylidene with MCM-41-N creates the new MCM-41-N-Hdhba Schiff-base. The synthesis and characterization of the new palladium (II) complex, [Pd(MCM-41-N-(Hdhba)2(dhba)Cl(H2O)], is also described. The structure and morphology of the Schiff-base and the Pd(II) complex have been examined using spectroscopic (IR, Raman, XPS, UV–vis and solid state 13C and 90Si NMR), morphological (low angle XRD, and HRTEM-EDS), elemental analysis, N2 physisorption and thermal measurements. The heterogeneous catalytic epoxidations of n-octene, cyclooctene and styrene were achieved by employing the new Pd(II) complex as a catalyst in the presence of aqueous 30% H2O2–0.2 M NaHCO3 at atmospheric pressure and 353 K. The influence of pH, temperature, time and amount of catalyst has also been investigated. The catalyst can be readily separated from the epoxidation reactions mixtures and can be recovered after several catalytic cycles.

Graphical abstractSchematic representation of functionalized MCM-41 with N-(3-(trimethoxysilyl)propyl)ethylenediamine (MCM-41-N), Schiff-base (MCM-41-N-Hdhba) and [Pd(MCM-41-N-(Hdhba)2-(dhba)Cl(H2O)] within the pore channels of MCM-41.Figure optionsDownload full-size imageDownload high-quality image (135 K)Download as PowerPoint slide

Keywords
MCM-41; Palladium; Complex; Schiff-base; Epoxidation
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A palladium(II) 4-hydroxysalicylidene Schiff-base complex anchored on functionalized MCM-41: An efficient heterogeneous catalyst for the epoxidation of olefins
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 488, November 2014, Pages 148–159
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
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Price was $35.95
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Price after discount Only $4.95
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