Exfoliation and immobilization of anionic iron porphyrin in layered double hydroxides

Bubniak, G.A.; Halma, Matilte; Nakagaki, Shirley

doi:10.1016/s0021-9797(03)00374-6

Cited by 61 publications

(49 citation statements)

References 26 publications

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“…LDH-NO 3 and the macroporous LDH (LDHM) were synthesized as described previously by our research group. [40][41][42] The free-base porphyrin [5,10,15,20- Preparation of the solid LDHME and intercalation of the FeP…”

Section: Methodsmentioning

confidence: 99%

“…In this context, layered double hydroxides (LDHs) have emerged as interesting supports to immobilize a variety of MPs. 18,23,[40][41][42][43][44] LDHs are synthetic layered compounds that contain divalent and trivalent metal cations [M(II) and M(III)] in a structure derived from the mineral brucite. In LDHs, M(III) metal ions replace part of the M(II) metals in the brucitelike structure, to give excess positive charge in the layers, counterbalanced by intercalating hydrated anions.…”

Section: -33mentioning

confidence: 99%

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Anionic Iron(III) Porphyrin Immobilized on/into Exfoliated Macroporous Layered Double Hydroxides as Catalyst for Oxidation Reactions

Nakagaki¹,

Castro²,

Ucoski³

et al. 2014

Journal of the Brazilian Chemical Society

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A oxidação de substratos orgânicos é uma importante classe de reações explorada visando a produção de insumos industriais tais como epóxidos, álcoois e cetonas. As metaloporfirinas são compostos com reconhecida atividade catalítica que mimetizam processos de oxidação que ocorrem em seres vivos. A sua imobilização em diferentes sólidos robustos e inertes permite a recuperação e reuso do catalisador em processos catalíticos heterogêneos. Hidróxidos duplos lamelares (LDHs) são materiais inorgânicos constituídos de hidróxidos de metais di e trivalentes, resultando em lamelas bidimensionais carregadas positivamente. Neste trabalho reportamos a preparação de catalisadores baseados na imobilização de ferroporfirina (FeP) em LDH macroporoso (LDHM) obtido pelo método de co-precipitação usando poliestireno como template, reconstrução de óxidos e esfoliação (LDHME). A imobilização da FeP no LDH intercalado com ânions nitrato obtido pelo método de co-precipitação também é reportada. Os sólidos obtidos foram caracterizados e investigados como catalisadores na oxidação do cicloocteno e cicloexano.The oxidation of organic substrates via catalytic routes is an important class of reactions to produce industrial input materials such as epoxides, alcohols, and ketones. Metalloporphyrins display recognized catalytic activity that mimics oxidation processes in living organisms. Their immobilization in different inert supports allows their recovery and reuse in heterogeneous catalytic processes. Layered double hydroxides (LDHs) are inorganic materials consisting of di-and trivalent metal hydroxides that afford bidimensional positively charged layers. This work reports on the preparation of the solid based on macroporous LDHs (LDHMs) by the co-precipitation method, which involved the use of polystyrene as template, oxides reconstruction, and exfoliation, to furnish LDHME. We also describe the immobilization of an iron(III) porphyrin (FeP) in LDHME and in LDH intercalated with nitrate anions, obtained by the co-precipitation method. Application of the immobilized catalysts in (Z)-cyclooctene and cyclohexane oxidation will help to assess their catalytic activity. Keywords: porphyrin, macroporous LDH, oxidation, biomimetic reaction, heterogeneous catalysis IntroductionThe family of enzymes collectively known as cytochrome P450 monooxygenases bear a heme prosthetic group and participate in different catalytic processes, mainly oxidative metabolism of endogenous/exogenous products in mammals. [1][2][3][4][5] Over the last years, researchers have made great efforts to develop routes that can generate robust synthetic metalloporphyrins (MPs), 6-10 aiming to mimic biological enzymes such as cytochrome P450 (biomimetic approach). Indeed, MPs can efficiently and selectively catalyze hydrocarbon oxidation.11 Some of these MPs are based on the structure of meso-tetraphenylporphyrin [H 2 (TPP)].The high efficiency and selectivity of MPs have motivated the proposition of technological catalytic systems based on this versatile family of oxidation ca...

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Section: Methodsmentioning

confidence: 99%

Section: -33mentioning

confidence: 99%

Anionic Iron(III) Porphyrin Immobilized on/into Exfoliated Macroporous Layered Double Hydroxides as Catalyst for Oxidation Reactions

Nakagaki¹,

Castro²,

Ucoski³

et al. 2014

Journal of the Brazilian Chemical Society

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“…5 The intercalation and the intercalated nanocomposites have potential applications in the fields of photophysics and photochemistry, 6 electrochemistry (as sensors or biosensors), 7 precursors of nanostructured oxides, 8 biomolecule carriers, 9 and drug storage and release. 10 Recently much attention has been payed on the LDHs exfoliation, and LDHs with the interlayer anions of dodecyl sulfate, 11 glycine, 12 amino acids, 13 lactate, 14 benzoate, 2,4-dichlorobenzoate-, hydroxybenzoate, 15 and nitrate 16 have been successfully exfoliated.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Layered Hydroxide Zinc m‐Aminobenzoate Compounds and Their Exfoliation Reactions

Zhao

Wang

et al. 2011

Chin. J. Chem.

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Two types of layered hydroxide zinc m-aminobenzoate compounds with structures of layered basic metal salt (LBMS) were prepared by the reaction of zinc hydroxide with m-aminobenzoic acid solution in the temperature range of 40-120 ℃. The formation reactions, structures, chemical compositions, and exfoliation reactions of the layered compounds in alcohol solvents were investigated by XRD, TG-DTA, SEM, and TEM. One layered phase with a basal spacing of 1.08 nm has a α-Ni(OH) 2 -like structure, and its chemical formula can be written as Zn(OH) 0.67 (m-NH 2 C 6 H 4 COO) 1.33 . This phase has strip-like particle morphology and cannot be exfoliated into its nanosheets in alcohol solvents. The other layered phase with a basal spacing of 2.66 nm has a zinc hydroxide-nitrate-like structure, and can be exfoliated in alcohol solvents.

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“…Recently much attention has been attracted on the LDHs exfoliation, and LDHs with the interlayer anions of dodecyl sulfate, 7) glycine, 8) amino acids, 9) lactate, 10) benzoate, 2,4-dichlorobenzoate-, hydroxybenzoate, 11) and nitrate 12) have been successfully exfoliated.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and exfoliation of layered hydroxide zinc aminobenzoate compounds

Zhao

Miao

Wang

et al. 2009

J. Ceram. Soc. Japan

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Exfoliation and immobilization of anionic iron porphyrin in layered double hydroxides

Cited by 61 publications

References 26 publications

Anionic Iron(III) Porphyrin Immobilized on/into Exfoliated Macroporous Layered Double Hydroxides as Catalyst for Oxidation Reactions

Anionic Iron(III) Porphyrin Immobilized on/into Exfoliated Macroporous Layered Double Hydroxides as Catalyst for Oxidation Reactions

Synthesis of Layered Hydroxide Zinc m‐Aminobenzoate Compounds and Their Exfoliation Reactions

Synthesis and exfoliation of layered hydroxide zinc aminobenzoate compounds

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