Anchoring of Vanadyl Acetylacetonate onto Amine‐Functionalised Activated Carbons: Catalytic Activity in the Epoxidation of an Allylic Alcohol

Abstract

Vanadyl(IV) acetylacetonate was anchored onto two different amine-functionalised activated carbons. The starting activated carbon supports were air (A2) and nitric acid oxidised (B1) carbons; the phenol surface groups of carbon A2 were subsequently treated with (3-aminopropyl)triethoxysilane (A3) and afterwards the free amine groups were used for Schiff condensation with [VO(acac) 2 ] (A4). Carbon B1, which possesses carboxylic surface groups, was treated with thionyl chloride to give surface acyl chloride groups (B2), which were then reacted with the amine groups of bis(3-aminopropyl)amine (B3); subsequent attachment of [VO(acac) 2 ] was also achieved by Schiff condensation between the free amine groups of the functionalised carbon and the ligand oxygen atoms (B4). All the materials were characterised by XPS, and the [VO(acac) 2 ]-based materials were also characterised by

Oxidative Cleavage of C=C Bond of Styrene and Its Derivatives with H2O2 using Vanadyl (IV) Acetylacetonate Anchored SBA-15 Catalyst

“…The parent SBA-15 was synthesized in accordance with the literature reports [22][23][24][25]. Aminopropylation of SBA-15 (SBA-NH 2 ) followed by anchoring of vanadyl (IV) acetylacetonate through Schiff base condensation between -NH 2 group of SBA-NH 2 and the -C=O group of acetylacetonate ligand coordinated to vanadyl(IV)acetylacetonate have been performed following the methods reported for the anchoring of metal acetylacetonates onto solid supports [18,21,[26][27][28][29]. The detailed synthetic procedure is as follows.…”

Anchoring of Ru–Pt and Ru–Au Clusters onto a Phosphane‐Functionalized Carbon Support

“…Some examples of molecular clusters deposited onto active carbon, without any particular interaction with the support, were developed to prepare supported catalysts for hydrogenation or ammonia synthesis. [7][8][9] Active carbon supports have been chemically functionalized with amines for example, [10] in order to prepare catalysts for epoxidation or aziridination reactions, [11,12] or to immobilize chiral complexes for enantioselective catalysis. [13] Given the nonbulk behaviour of nanometer-sized particles, it is important to understand the structure-activity relationship of supported nanoparticles.…”

Oxidovanadium(IV) Complexes of 3-Hydroxy-4-pyrone and 3-Hydroxy-4-pyridinone Ligands: A New Generation of Homogeneous Catalysts for the Epoxidation of Geraniol

“…The complexes reported in this work present different reactive groups in their ligands (Br, Cl, OH), which can be used to anchor them onto inorganic porous supports by different immobilization strategies and remarkably, without changing the coordination sphere of the metal centre, thus overcoming the drawback of the [VO(acac) 2 ] heterogeneous systems reported in literature [42][43][44][45]. Moreover, these types of ligands are easily modified with other reactive functionalities, which can be selectively chosen not only to fine tune the catalytic performance of the metal centre (improving their catalytic activity), but also to design novel immobilization strategies for their heterogenization onto porous supports.…”

“…In fact, the covalent immobilization of [VO(acac) 2 ] onto several types of porous supports such as clays and pillared clays [42,43], activated carbon [45] and mesoporous silicas [42,44] has been performed by using 3-aminopropyltriethoxysilane as spacer, through reaction of the amine groups of the functionalized support with the acetylacetonate ligand (C=O functionality) of the complex. However, these methods lead to a change in the coordination sphere of the metal centre, which invariably originates lower catalytic performances for the heterogeneous [VO(acac) 2 ] systems when compared to the homogeneous counterpart.…”