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

Removal of copper(II) ions from Aqueous Media by Chemically Modified MCM‐41 with N‐(3‐(trimethoxysilyl)propyl)ethylenediamine and Its 4‐hydroxysalicylidene Schiff‐base

“…On the other hand, a sort of pore narrowing occurs for MCM‐41‐N‐Hdhba; that is, the diffusion process leads to a relatively slow rate of diffusion. This feature is further supported from our early reported nitrogen adsorption–desorption results, which showed decrease in both pore diameters and pore sizes with increase in the wall thickness for MCM‐41‐NH 2 and MCM‐41‐N‐Hdhba, to be (2.61 and 2.39 nm), (0.624 and 0.401 cm 3 g −1 ) and (2.02 and 2.3 nm), respectively (Table ) . These data are supported by those reported for the uptake of Cu(II) ions onto 2,2′‐(ethylenedithio)diethanol immobilized amberlite XAD‐16 with chlorosulfonic acid resin .…”

“…The TEM images of MCM‐41‐NH 2 and MCM‐41‐N‐Hdhba show high ordered hexagonally mesostructure. After adsorption of Cu(II) ion, the hexagonal pores remained intact, with lowering in the regular arrangement of the pores . The presence of equidistant parallel fringes demonstrates the nature of the separation between layers and the unique well‐packed arrangement of such monolayers .…”

“… Synthesis of modified mesoporous silica (MCM‐41‐NH 2 ) and its 4‐hydroxysalicylidene Schiff‐base (MCM‐41‐N‐Hdhba) . [Color figure can be viewed at http://wileyonlinelibrary.com]…”

Mn-Schiff base modified MCM-41, SBA-15 and CMK-3 NMs as single-site heterogeneous catalysts: Alkene epoxidation with H2O2 incorporation

“…In the front of development of alkene epoxidation catalysts, so far few studies have been reported for covalently grafting of Schiff base metal-complexes onto mesoporous MCM-41 [20][21][22][23][24][25][26][27][28], SBA-15 [29,30] and CMK-3 [31]. In these cases, the main adopted synthetic strategy involved Schiff base immobilization via reaction with the surface modified silicon-based materials [20][21][22][23][24][27][28][29][30]; alternatively, the entire Schiff base metal complex was tethered via axial ligation to H2N-modified MCM-41 [25][26] or -OOC-modified CMK-3 [31].…”

“…In these cases, the main adopted synthetic strategy involved Schiff base immobilization via reaction with the surface modified silicon-based materials [20][21][22][23][24][27][28][29][30]; alternatively, the entire Schiff base metal complex was tethered via axial ligation to H2N-modified MCM-41 [25][26] or -OOC-modified CMK-3 [31]. Among these studies, there are three examples which report H2O2 activation [20,25,31] and three catalytic systems, i.e. [Mn II -Schiff base/MCM-41/t-BuOOH] [28], [Mn III -Schiff base/SBA-15/t-BuOOH] [30] and [Mn III -Schiff base/CMK-3/ H2O2] [31], which use Mn-Schiff base complexes as active catalytic components.…”