Immobilization of imidazolium ionic liquids on hydrotalcites using silane linkers: retardation of memory effect

Abstract

We report a new covalent surface immobilization of silane-modified imidazolium ionic liquids on hydrotalcite-like materials (HTs) and provide detailed characterization of the resulting surface chemistry using PXRD, CP-MAS, TGA and FT-IR.

Electronic Support Effects of Tunable Mixed Metal Oxides on Immobilized Palladium N‐Heterocyclic Carbene Complexes

“…This study aims to determine whether electric differences in the MMO support translate to differences in the electronic environment of immobilized Pd complexes. To answer this question, we investigated the electronic properties of Pd N‐heterocyclic carbene (NHC) complexes immobilized on a series of different MMOs via silane linkers …”

“…FTIR spectra of x MMO‐ 1 ‐[Pd] confirmed the presence of immobilized ionic liquid 1 based on observation of new C‐H stretches at 3200–2800 cm –1 , C=C stretches and C=N stretches at 1740 cm –1 and 1600 cm –1 , and C–C bending at 1100 cm –1 (Figure ), all consistent with the features of 1 reported after immobilization on silica and hydrotalcite . Immobilization of Pd does not result in notable changes in the IR features of MMO‐ 1 , as expected from the lack of IR‐active normal modes of square planar ( D 4 h ) Pd complexes in the range of 600–3000 cm –1 .…”

“…mixed metal oxides) by refluxing 0.50 g of 1 with 0.50 g of the support in toluene for 12 h. Subsequently, the weakly bound imidazolium salts were removed via Soxhlet extraction with dichloromethane to afford MMO‐ 1 . Attachment of 1 to the support was confirmed by FTIR and CP/MAS . MMO‐ 1 (0.60 g) and PdCl 2 (0.018 g) were then refluxed in acetonitrile under a nitrogen atmosphere for 12 h, followed by Soxhlet extraction with acetone.…”

Effect of SILPs on the Vulcanization and Properties of Ethylene–Propylene–Diene Elastomer

“…The preparation of SILP materials using several polymeric and inorganic supports has been the subject of several studies. Various materials, such as carbon materials, alumina, different types of silica, hydrotalcites, as well as metal oxides, have been used as support in the preparation of SILPs, which have mainly been applied in catalysis and separation processes so far [22][23][24][25][26][27]. Considering elastomer composites, the literature shows that ILs are, in most cases, added directly to the rubber during the preparation of the rubber compounds.…”