Study of the Catalytic Behavior of Montmorillonite/Iron(III) and Mn(III) Cationic Porphyrins

Machado, A.M.; Drechsel, Sueli M.; Nakagaki, Shirley

doi:10.1006/jcis.2002.8488

Cited by 76 publications

(23 citation statements)

References 34 publications

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“…[1][2][3][4] This class of compounds is used in solution or following immobilization in organic amorphous polymers and crystalline inorganic materials such as silica, [5][6][7] zeolites, 8,9 clay from the smectite group (montmorillonite) 10,11 and others. [12][13][14][15][16] The use of metalloporphyrins substituted with electron-withdrawing groups (the so-called second generation porphyrins 17 ) and their immobilization, has resulted in efficient and selective catalysts for oxidation reactions, since the support can impose shape selectivity and promote a special environment, favoring the approach of the substrate to the active catalytic specie.…”

Section: Introductionmentioning

confidence: 99%

Catalytic activity in oxidation reactions of anionic iron(III) porphyrins immobilized on raw and grafted chrysotile

Nakagaki¹,

Castro²,

Machado³

et al. 2006

J. Braz. Chem. Soc.

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Crisotila natural e quimicamente modificada foi usada como matrizes para imobilização de ferroporfirinas de segunda geração. As atividades catalíticas dos sólidos obtidos foram avaliadas em reações de oxidação de cicloexano, usando iodosilbenzeno como oxidante. Os resultados de catálise foram analisados e comparados aos obtidos pela imobilização das mesmas ferroporfirinas em sílica funcionalizada com 3-APTS, derivadas do tratamento ácido da crisotila. Os resultados preliminares mostraram que os catalisadores são eficientes e seletivos para a obtenção de álcool.Natural and grafted chrysotile were used as matrices for the immobilization of second generation iron porphyrins. The catalysts obtained were evaluated in the oxidation reaction of cyclohexane, using iodosylbenzene as oxidant agent. The catalyst activity for different conditions was compared with results for the same porphyrins immobilized with 3-APTS grafted disordered silica, obtained from acid-leached chrysotile. Preliminary results have shown that high activity can be obtained with short reaction times, and that the reaction is specific for alcohol.

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Section: Introductionmentioning

confidence: 99%

Catalytic activity in oxidation reactions of anionic iron(III) porphyrins immobilized on raw and grafted chrysotile

Nakagaki¹,

Castro²,

Machado³

et al. 2006

J. Braz. Chem. Soc.

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“…Comparing these spectra with those of the corresponding non-supported metalloporphyrins, the Soret bands are red-shifted by about 2 nm (Fig. 2, insert), which can be attributed to the distortion of the porphyrin rings usually observed when metalloporphyrins are immobilized on solid supports [27][28][29][30]. The bands at 581 and 660 nm are normally present in the spectra of supported metalloporphyins and result from solid state effects [27,28,30,31].…”

Section: Characterizationmentioning

confidence: 82%

Synthesis and catalytic activities in cyclohexane hydroxylation of metalloporphyrins supported on styrene-methylacrylic acid copolymer microspheres

Zhao

et al. 2008

Transition Met Chem

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Through a new synthetic strategy, metalloporphyrins (M = Fe(III), Mn(III) or Co(II)) were covalently immobilized on styrene-methylacrylic acid copolymer microspheres. These copolymer-immobilized metalloporphyrins were found to be more efficient catalysts than the analogous non-supported metalloporphyrins for cyclohexane hydroxylation in metalloporphyrin-O 2 -ascrobate mixtures. The catalytic activities of the immobilized catalysts follow the order Fe[Mn[Co.

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“…Compared to the non-supported MnCMPTTP (Fig. 2, insert), these bands have redshifts about 15 nm, which can be attributed to the distortion of the porphyrin rings usually observed when metalloporphyrins are immobilized on solid supports [27][28][29][30].…”

Section: Resultsmentioning

confidence: 99%

Styrene-hydroxyethyl methacrylate copolymer-supported porphyrinatomanganese(III) complexes: synthesis and catalytic cyclohexane hydroxylation with molecular oxygen

Cai

et al. 2010

Transition Met Chem

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Two new styrene-hydroxyethyl methacrylate copolymers containing immobilized porphyrinatomanganese(III) were prepared and characterized as microspheres by SEM, UV-Vis, FT-IR, and TG-DTG. Their catalytic activities have been investigated for the hydroxylation of cyclohexane in the presence of molecular oxygen under mild conditions. The copolymer microspheres proved to be more efficient catalysts than the corresponding nonsupported porphyrinatomanganese(III) complex. The alkylated polymer microspheres with porphyrinatomanganese(III) had the highest catalytic activity, which may be attributable to the hydrophobic microenvironment around the porphyrinatomanganese(III) centers, resulting from the alkyl groups.

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Study of the Catalytic Behavior of Montmorillonite/Iron(III) and Mn(III) Cationic Porphyrins

Cited by 76 publications

References 34 publications

Catalytic activity in oxidation reactions of anionic iron(III) porphyrins immobilized on raw and grafted chrysotile

Catalytic activity in oxidation reactions of anionic iron(III) porphyrins immobilized on raw and grafted chrysotile

Synthesis and catalytic activities in cyclohexane hydroxylation of metalloporphyrins supported on styrene-methylacrylic acid copolymer microspheres

Styrene-hydroxyethyl methacrylate copolymer-supported porphyrinatomanganese(III) complexes: synthesis and catalytic cyclohexane hydroxylation with molecular oxygen

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