Pd(II) loaded on diamine functionalized LDH for oxidation of primary alcohol using water as solvent

Abstract

Hybrid inorganic-organic materials which comprise organic functional groups tethered from layered double hydroxide surfaces are versatile, heterogeneous catalysts. This functional group can bind with palladium that provides catalytic activity superior to what can be obtained from homogeneous catalysts. This work reports synthesis of heterogeneous and recyclable Pd(II) (supported on diamine functionalized layered double hydroxide) catalyst for oxidation of primary alcohol using water as solvent and molecular O-2 as a terminal oxidant. The organometallic-derived catalyst has been studied by XRD, FTIR, UV-vis DRS, solid-state NMR (C-13, Si-29), XPS, TGDTA, SEM and EDX. Here the ligand N-[3-(trimethoxysilyl)propyl] ethylenediamine (TPED) is covalently attached to the surface of LDH, which is shown by NMR spectroscopy. XPS results strongly suggest that it involves the formation of N-Pd coordination bonds. EDX confirmed that all the elements were present in the LDH/Pd(II) complex. The heterogeneous catalyst can be easily recovered and reused multiple times without significant loss of catalytic activity and selectivity, which is a better green alternative for practical applications. (c) 2013 Elsevier B.V. All rights reserved.