Host–Guest Interactions in Zeolites and Periodic Mesoporous Materials

Bein, Thomas

doi:10.1016/s0167-2991(07)80806-8

Cited by 18 publications

(10 citation statements)

References 284 publications

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“…Recently, organic dye molecules have been immobilized in a zeolite or a molecular sieve to prepare sensors. 15,16 On the other hand, copper(II) ions act as the active center in many metalloenzymes, [17][18][19] such as galactose oxidase, and the coordination sphere around copper center in the titled N 4 -Cu(II) Schiff base complex, mimics the coordination environment of the copper(II) ion of galactose oxidase.…”

Section: Introductionmentioning

confidence: 99%

Heterogeneous Green Catalyst for Oxidation of Cyclohexene and Cyclooctene with Hydrogen Peroxide in the Presence of Host (Nanocavity of Y‐zeolite)/Guest (N4‐Cu(II) Schiff Base Complex) Nanocomposite Material

2011

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Copper(II) complex of a Schiff base ligand derived from pyrrolcarbaldehyde and o-phenylenediamine (H 2 L) has been synthesized and encapsulated in Y-zeolite matrix. The hybrid material has been characterized by elemental analysis, IR and UV-Vis spectroscopic studies as well as X-ray diffraction (XRD) pattern. The encapsulated copper(II) catalyst is an active catalyst for the oxidation of cyclooctene and cyclohexene using H 2 O 2 as oxidant. Under the optimized reaction conditions 81% conversion of cyclohexene with 65% selectivity for 2-cyclohexenone formation and 87% conversion of cyclooctene with 46% selectivity for epoxide formation were obtained.

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Section: Introductionmentioning

confidence: 99%

Heterogeneous Green Catalyst for Oxidation of Cyclohexene and Cyclooctene with Hydrogen Peroxide in the Presence of Host (Nanocavity of Y‐zeolite)/Guest (N4‐Cu(II) Schiff Base Complex) Nanocomposite Material

2011

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“…As a result of their high surface areas, zeolite catalysts contain a very high density of active sites that are directly involved in the reaction at a molecular level, which in turn results in enhanced activity and thus a more effective catalytic system. On account of the angstrom-scaled features they possess, zeolites and other zeo-type materials also present significant potential for future utilization in numerous advanced applications in the fields of nanotechnology [2] including those in nanofabrication and optoelectronics [3,4] as well as in biotechnology [5].…”

Section: Introductionmentioning

confidence: 99%

Zeolites Catalyzing Raw Material Change for a Sustainable Chemical Industry

Yilmaz¹,

Müller

2016

Green Chemistry and Sustainable Technology

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The diversity and the flexibility of raw materials are crucial aspects of sustainability in the chemical industry. The key enabler for raw material change is heterogeneous catalysis. Being a well-established family of nanoporous materials, zeolites have historically been of paramount importance for the chemical industry as heterogeneous catalysts with high surface areas, enhanced activity and shape/ size-selective character in numerous chemical reactions. As a result of these characteristics, zeolites are also destined to play a pivotal role in the quest for raw material change as catalysts providing the required selectivity towards base chemicals, ensuring the sustainability of the chemical industry.

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“…[18][19][20] Nevertheless, some of the parameters that control the reaction and the subsequent electron transfer remain unclear and require complementary investigations. Previous experiments showed that the spontaneous ionization of low-ionization-potential molecules could occur only within a highly polarizing internal space.…”

Section: Introductionmentioning

confidence: 99%

Spontaneous Ionization of N‐Alkylphenothiazine Molecules Adsorbed in Channel‐Type Zeolites: Effects of Alkyl Chain Length and Confinement on Electron Transfer

Carré¹,

Luchez²,

Moissette³

et al. 2011

ChemPhysChem

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The mere mixing of N-alkylphenothiazines with three channel-type acid zeolites with various structures (ferrierite, H-MFI, and mordenite) induces the spontaneous ionization of the heterocyclic molecule in high yield upon adsorption. The diffuse reflectance UV-visible absorption and Raman scattering spectra show that the accessibility of the highly polarizing acid sites is not indispensable to induce the spontaneous ionization process. Due to their particularly low ionization potential values (6.7 eV), the adsorption of the molecules on the external surface or in the inner volume is the key parameter to generate the radical cation. However, the ionization yield and charge stabilization are intimately correlated to the possibility of the zeolites accommodating molecules inside their channels. Moreover, the higher electrostatic field gradient induced by high confinement is required to favor the second ionization and dication formation. The alkyl chain length plays a decisive role by either slowing down the diffusion process or blocking the molecule at the pore entry. Therefore, the efficiency of the ionization process that depends on the number of adsorbed molecules decreases significantly from phenothiazine to the N-alkylphenothiazines. The spectral data demonstrate that deformation of the alkyl group is necessary to allow the diffusion of the molecules into the channels.

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Host–Guest Interactions in Zeolites and Periodic Mesoporous Materials

Cited by 18 publications

References 284 publications

Heterogeneous Green Catalyst for Oxidation of Cyclohexene and Cyclooctene with Hydrogen Peroxide in the Presence of Host (Nanocavity of Y‐zeolite)/Guest (N4‐Cu(II) Schiff Base Complex) Nanocomposite Material

Heterogeneous Green Catalyst for Oxidation of Cyclohexene and Cyclooctene with Hydrogen Peroxide in the Presence of Host (Nanocavity of Y‐zeolite)/Guest (N4‐Cu(II) Schiff Base Complex) Nanocomposite Material

Zeolites Catalyzing Raw Material Change for a Sustainable Chemical Industry

Spontaneous Ionization of N‐Alkylphenothiazine Molecules Adsorbed in Channel‐Type Zeolites: Effects of Alkyl Chain Length and Confinement on Electron Transfer

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