Electron Transfer in Layered and Intercalated Compounds

Bhat, Vasudeva; Domen, Kazunari

doi:10.1002/9783527618248.ch56

Cited by 4 publications

(3 citation statements)

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“…In general, the negative charge density of transition-metal layered oxides is higher than that of clay minerals, and sheets of the material often exhibit electric conductivity and photoresponses based on band gap transitions. These types of layered oxides have actually been applied as photocatalysts. − …”

Section: Introductionmentioning

confidence: 99%

Exfoliated Nanosheets as a New Strong Solid Acid Catalyst

et al. 2003

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Two-dimensional metal oxide sheets in HTiNbO(5) and HSr(2)Nb(3)O(10), cation-exchangeable layered metal oxides, were examined as solid acid catalysts. Exfoliation of HTiNbO(5) and HSr(2)Nb(3)O(10) in aqueous solutions formed colloidal single-crystal TiNbO(5)(-) and Sr(2)Nb(3)O(10)(-) nanosheets, which precipitated under an acidic condition to form aggregates of HTiNbO(5) nanosheets and HSr(2)Nb(3)O(10) nanosheets. Although esterification of acetic acid, cracking of cumene, and dehydration of 2-propanol were not catalyzed by original HTiNbO(5) because of the narrow interlayer distance, which prevents the insertion of organic molecules, HTiNbO(5) nanosheets functioned as a strong solid acid catalyst for the reactions. Nanosheets of HSr(2)Nb(3)O(10) exhibited no or slight catalytic activity for these reactions. NH(3) temperature-programmed desorption and (1)H magic-angle spinning nuclear magnetic resonance spectroscopy revealed that HTiNbO(5) nanosheets have strong Brønsted acid sites, whereas HSr(2)Nb(3)O(10) nanosheets do not.

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Section: Introductionmentioning

confidence: 99%

Exfoliated Nanosheets as a New Strong Solid Acid Catalyst

et al. 2003

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“…4,5 The layered compounds mentioned above consisted of clays, 6,7 sulfides, [8][9][10] hydroxides, [11][12][13][14] and oxides. [15][16][17][18][19][20][21][22][23][24][25] Especially, those types of layered oxides have actually been applied as photocatalysts [26][27][28][29] widely. From the viewpoint of heterogeneous catalysis, these layered materials may have persuasive advantages in the large inner surface, which could act as the nanoreactor, and the solid acid (the protonized form exhibiting).…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, in comparison with conventional nanoscale materials, they possessed distinctive physical and chemical properties. 27 To date, the progress in soft-solution processing has been widely utilized to make such an attempt possible. [30][31][32][33][34][35][36] A conventional process to prepare the nanosheet included the solid-state reaction, then protonic pro-cedure for ca.…”

Section: Introductionmentioning

confidence: 99%

A Facile Route to Synthesize the Ti₅NbO₁₄ Nanosheets by Mechanical Cleavage Process

Zhang¹,

Chu²,

Li³

et al. 2010

Journal of the American Ceramic Society

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Layered and rod‐like K3Ti5NbO14 was synthesized via the solid‐state chemistry, and it was exfoliated into nanosheets through a novel mechanical cleavage technology. X‐ray diffraction was utilized to determine the phase changes of all the specimen during the total process, and the microstructure of the samples was analyzed by scanning electron microscope and transmission electron microscope. The formation mechanism was also discussed in detail, the results indicated that the compression and shearing should play a main function in the crack and the cleavage of the aggregated layered compound. UV–vis absorption spectroscopy was used to monitor the consecutive buildup of the (PEI/Ti5NbO14)n film. The resulting quasi‐linear increase at the top absorbance as a function of the sequential assembly number for the multilayer film indicated that the nanosheet had deposited uniformly in each dipping cycle. The photocatalytic activity of K3Ti5NbO14‐related products was examined. Compared with original layered compound, nanosheet precipitate had good property under irradiation of ultraviolet light.

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Electron Transfer in Coordination Compounds

Endicott

2005

Encyclopedia of Inorganic Chemistry

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The transfer of an electron between a transition metal donor and a transition metal acceptor can be promoted by the absorption of either thermal or light energy. The thermal processes have been experimentally determined to span a range of about 10 20 in their ambient rates of electron transfer. The same molecular properties that determine the electron‐transfer reactivity also determine the correlated electron‐transfer absorption or emission band energy, band shape, and absorptivity. The relationships between the thermal‐kinetic and the spectroscopic observations are relatively simple when there is very little electron delocalization between the donor and acceptor, the weak‐coupling limit. This limit applies to most bimolecular electron‐transfer reactions of transition metals and to the spectroscopy of transition metal ion pairs; this is the limit treated well by Marcus theory. When the donor and acceptor are covalently linked, interactions of the donor and acceptor with the linker often increase the coupling in such a way as to enhance the reactivity and to alter the spectroscopy. Most of these linker‐induced changes of reactivity and spectroscopy can be treated in terms of perturbation theory‐based alterations of the behavior in the weak‐coupling limit. Reactivity in some very strongly coupled complexes seems to fall outside the standard theoretical framework; many such systems seem to implicate nuclear motions of the linker in facilitating the donor–acceptor electronic coupling. Extensions to biological, multicentered, and heterogeneous systems containing transition metal complexes are briefly considered.

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Electron Transfer in Layered and Intercalated Compounds

Cited by 4 publications

References 204 publications

Exfoliated Nanosheets as a New Strong Solid Acid Catalyst

Exfoliated Nanosheets as a New Strong Solid Acid Catalyst

A Facile Route to Synthesize the Ti₅NbO₁₄ Nanosheets by Mechanical Cleavage Process

Electron Transfer in Coordination Compounds

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Electron Transfer in Layered and Intercalated Compounds

Cited by 4 publications

References 204 publications

Exfoliated Nanosheets as a New Strong Solid Acid Catalyst

Exfoliated Nanosheets as a New Strong Solid Acid Catalyst

A Facile Route to Synthesize the Ti5NbO14 Nanosheets by Mechanical Cleavage Process

Electron Transfer in Coordination Compounds

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A Facile Route to Synthesize the Ti₅NbO₁₄ Nanosheets by Mechanical Cleavage Process