Highly selective allylic oxidation of cyclohexene to 2-cyclohexen-1-one under mild conditions over vanadyl-porphyrin implanted onto the amino-functionalized SBA-15

V-Porphyrins Encapsulated or Supported on Siliceous Materials: Synthesis, Characterization, and Photoelectrochemical Properties

“…All these bands are also observed for VTPP-containing catalysts, although bands at 1268, 1151, 1058, 1013, 1000, 983, and 959 cm −1 appeared in the form of shoulders (because they overlap with the broad bands of Si-O-Si and Si-O-C) [ 14 ]. Accordingly, the presence of all these bands confirms the incorporation of VTPP in the catalysts, which is in agreement with previous results for V-porphyrins [ 18 , 26 , 27 , 28 , 29 ]. In addition, this suggests also that the VTPP is structurally unchanged and uniformly distributed in the mesoporous material [ 30 ].…”

“…The catalysts have been also characterized by DR-UV–vis spectroscopy, since most porphyrins present visible bands between 400 and 600 nm, usually called the Soret α and β bands [ 26 , 27 , 28 , 29 , 52 , 53 ]. The DR-UV–vis spectra of catalysts are shown in Figure 3 , whereas those related to the pure VTPP sample are presented in Figure S7 .…”

“…Therefore, the search for new applications of these V-containing petroporphyrins is highly interesting. Vanadium(IV)-porphyrin-containing materials are also paramount [ 24 , 25 , 26 , 27 ], in which special attention has been paid to the use of Vanadyl-porphyrins incorporated on the surface of supports or encapsulated in mesoporous materials [ 13 , 28 , 29 , 30 , 31 , 32 ]. It is well-known that changes in the type of functional groups and/or in the position of the substituents in the porphyrin macrocycle can give rise to modifications in the physicochemical and catalytic properties [ 6 , 7 , 8 , 9 ], but significant changes in physicochemical characteristics could also occur when incorporating metalloporphyrins into inorganic oxides [ 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 28 , 29 , 30 , 31 , 32 ].…”

Porphyrins and Phthalocyanines on Solid-State Mesoporous Matrices as Catalysts in Oxidation Reactions

“…Catalytic activity of vanadyl 5,10,15,20-tetrakis-(4-methoxycarboxyphenyl)porphyrin covalently-linked to APTES-functionalized SBA-15 [ 68 ] was also tested. Vanadium was selected due to its multiple oxidation states and high oxidation potential.…”

Instant and quantitative epoxidation of styrene under ambient conditions over a nickel(ii)dibenzotetramethyltetraaza[14]annulene complex immobilized on amino-functionalized SBA-15

“…In contrast, the heterogenization of these catalysts by incorporating them in a solid matrix via chemical bonds will increase their stability, facilitate their separation, and make their reusability possible. For these advantages, various supports have been used in the literature such as mesoporous silica, [19][20][21][22] nanoporous carbon, 23 zeolites, 24 polymers, 25 clays [26][27][28][29] and resins. 30 In addition, the porous solid matrixes with high surface area and pore size, such as mesoporous silica SBA-15, allow good diffusion of reactants to the interior active sites of the catalyst without using swelling media.…”