Metalloporphyrin-functionalized hexagonal mesoporous silica: Synthesis, structural properties and catalytic activity as cytochrome P450 model

The Research on Porphyrins and Analogues in Brazil: A Small Review Covering Catalytic and other Applications since the Beginning at Universidade de São Paulo in Ribeirão Preto until the Joint Venture between Brazilian Researchers and Colleagues from Universidade de Aveiro, Portugal

“…This was probably caused by the relative arrangement of MnP2 with the β-pyrrolic bromine atoms inside the pores of SBA-15 in the SBA-Si-Mag support (Figure 12), in comparison to the arrangement of MnP1, which seemed to be immobilized on the surface of the support and showed selectivity to 2-and 3-hexanol. Although other metalloporphyrins have been immobilized on SBA-15 and other mesoporous silica solids (HMS, MCM-41), 85,86,[88][89][90][91]94 similar selectivity results were not reported before. This astonishing selectivity for position C-1 indicates that the immobilization of MnP2 inside the pores of SBA-Si-Mag produced a selective catalyst for the oxidation of the terminal carbon of n-hexane, which is another amazing example of a non-innocent support contribution to the unusual selectivity of solids resulting from immobilization of MPs.…”

“…In spite of all the different solids used as supports for the immobilization of metalloporphyrins (Table 1), there is an expectation that MPs organized as porous materials, either using a porous solid as support (e.g., macroporous LDH, mesoporous silicas or zeolites), [85][86][87][89][90][91]99,100,125 or integrated into porous structures, such as metal-organic frameworks (MOFs) 27,80,140,141,145,146,192,193 or porous organic polymers (e.g., PIM = polymers of intrinsic microporosity), 149,153 will have enhanced catalytic performance, mainly regarding the selectivity, relative to non-porous materials, since the confinement effect for reagents and/or products may lead to unusual and unexpected selectivities for the same reaction relative to a homogeneous environment.…”

Mesoporous chitosan‐immobilized iron tetrakis(4‐carboxyphenyl)porphyrin as a model of cytochrome P‐450 enzyme for oxidation of ethylbenzene

“…Therefore, new methods need to be employed to modify the CTS to make it being a better support for metalloporphyrins. Mesoporous materials with the advantages of large surface area, well‐defined pore size, high mechanical and thermal stability, have been used as support in many studies, and these materials present good catalytic performance and stability . Based on these facts, the porous chitosan was used as the support for metalloporphyrins and the resulted M TCPP/p‐CTS showed great catalytic activity for aerobic oxidation of cyclohexane due to the porosity and specific surface area of chitosan .…”

Low-Power Upconversion in Anthracene Derivatives Doped with Pd(II) Tetraphenylporphyrin

“…Their linear absorption, single-photon excited fluorescence and triplet-triplet annihilation upconversion fluorescence properties were studied. EXPERIMENTAL Palladium(II) tetraphenylporphyrin (PdTPP) was synthesized according to the procedure published 16 . The anthracene Triplet-triplet annihilation upconversion measurements: Diode pumped solid state laser (emission wavelength: 532 nm) was used as the excitation source for the upconversion.…”