Platinum‐Imidazolyl Schiff Base Complexes Immobilized in Periodic Mesoporous Organosilica Frameworks as Catalysts for Hydrosilylation

Abstract

An imidazolyl Schiff base-containing periodic mesoporous organosilica (PMO) was synthesized via co-condensation reactions between a newly prepared bis (imidazolyl)imine-bridged bis silane and tetraethyl orthosilicate in the presence of cetyltrimethyl ammonium bromide as a soft template. The resultant assynthesized PMO was then employed as a solid support for platinum catalysts. This complex was fully characterized via various techniques including FTIR, solid-state 13 C NMR, and 29 Si-NMR spectroscopy, as well as N 2 adsorption/desorption analysis, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) methods. In addition, the catalyst was proven to efficiently mediate hydrosilylation reactions between olefins and hydrosilanes, and it can be reused for at least five cycles without significant loss of activity.

Erratum: Platinum‐Imidazolyl Schiff Base Complexes Immobilized in Periodic Mesoporous Organosilica Frameworks as Catalysts for Hydrosilylation

“…Schemes 1 and 2 in Huo et al . [ 1 ] were transposed during production of the article. The Schemes are correct but they appear in the incorrect position and with the incorrect legend.…”

Uranyl N2O2-Schiff base complex as co-catalyst in ethanol electro-oxidation: synthesis, crystallographic, spectroscopic, electrochemical, and DFT characterization, and catalytic investigation

“…24 Among them, the above salen-type compounds are important in that complexes containing these ligands have been employed as catalysts in several catalytic systems. [25][26][27][28][29][30][31][32][33] Salen-type compounds have been widely used as ligands in coordination complexes due to the easiness and low cost of syntheses of polydentate ligands with fine-tunable structural and electronic features. 25,26,34 These tunable properties, along with the availability of donor atoms other than the imine nitrogen, enable these ligands to coordinate to virtually any metal center, thus making it possible to stabilize a wide range of oxidation states.…”

“…24 Among them, the above salen-type compounds are important in that complexes containing these ligands have been employed as catalysts in several catalytic systems. 25–33…”

Synthesis of alkynyl phosphite ligands and its application in the preparation of high stability one‐component heat‐curable silicone rubber

“…The process of hydrosilylation reaction is shown in Figure 1. A series of transition metals (such as platinum, 14–16 rhodium, 17–19 palladium, 20,21 and ruthenium 22,23 ) have been proven to be effective catalysts for the preparation of hydrosilylation reaction. Although in the past two decades a wide range of catalysts for hydrosilylation reaction has been reported, the most popular used catalysts are still platinum‐based catalysts in industry, which have been developed for more than half a century, such as Pt (0)‐divinyl‐tetramethyl disiloxane complex (Karstedt's catalyst) 24,25 and the isopropyl alcohol solution of H 2 PtCl 6 (Speier's catalyst) 26 .…”