Novel porous materials based on oligospiroketals (OSK)

Wessig, Pablo; Gerngroß, Maik; Pape, Simon; Bruhns, Philipp; Weber, Jens

doi:10.1039/c4ra04437a

Cited by 8 publications

(8 citation statements)

References 35 publications

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“…However, as shown in Table S1, these V-based catalysts typically suffer from significant leaching of V species (20-90 mol. %) during liquid-phase oxidation reactions when peroxides are used as oxidants [1,5,6,[11][12][13][14][15][16][17][18][19][20]. This phenomenon, unfortunately, limits the practical applications of these materials because it significantly reduces their lifetimes as catalysts and requires additional separation processes to remove leached V species from the liquid phase [13,20].…”

Section: Introductionmentioning

confidence: 99%

Catalytic activity and stability of carbon supported V oxides and carbides synthesized via pyrolysis of MIL-47 (V)

Kim

McNamara

Hicks

2016

Applied Catalysis A: General

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Substantial leaching of active V species often limits the reusability of V-based soild catalysts in liquidphase oxidation reactions and therefore requires the development of more stable, novel materials. This paper first reports the synthesis of active vanadium (V) oxide and carbide species dispersed on a carbon support via the pyrolysis of MIL-47 (V), a V-based metal-organic framework (MOF) template. The phase transition of V species present in this MOF template was achieved by varying the pyrolysis temperatures ranging from 600 to 1100 °C to synthesize a series of carbon catalysts with different surface and bulk phases of V. Notably, the pyrolysis of MIL-47 (V) provided carbon supports with high surface areas (~ 350 m 2 g-1), high mesoporosities (V MESO /V PORE~ 0.88), high V quantities (35-70 wt. %), and small (~ 18 nm) V crystallites dispersed on the surface. These desired properties were not observed when V was supported on activated carbon (V/AC) via conventional impregnation. The V/AC catalyst showed lower mesoporosity (~0.63), lower V quantity (~25 wt. %), and larger V crystallites (~ 27 nm) compared to the catalyst produced from MIL-47 (V) pyrolysis under identical conditions. Of additional note, the pyrolysis of MIL-47 (V) could yield an isolated bulk phase of V carbide at low pyrolysis temperatures (i.e., >900 °C). This phase was not attainable when V/AC was synthesized via pyrolysis even at higher temperatures (i.e., 1100 °C). The catalytic performance of the resulting V on carbon catalysts was evaluated in a liquidphase oxidation reaction of dibenzothiophene. The V carbide catalysts exhibited good activities and enhanced stabilities, as evidenced by lower amounts of V species leached (< 20%) during recycle runs compared to the conventional V/AC catalyst (V leaching ~56%). This study marks a signifcant improvement in the synthesis of supported V catalysts with reduced leaching in liquid-phase oxidation reactions compared to materials synthesized via conventional impregnation techniques.

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Section: Introductionmentioning

confidence: 99%

Catalytic activity and stability of carbon supported V oxides and carbides synthesized via pyrolysis of MIL-47 (V)

Kim

McNamara

Hicks

2016

Applied Catalysis A: General

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“…Several applications of OSK rods were explored in the past years. Worthy of note are the incorporation in biological and artificial membranes [ 11 – 13 ], the utilization as spacer in FRET systems [ 14 ], and as building blocks in porous materials [ 15 ].…”

Section: Introductionmentioning

confidence: 99%

Articulated rods – a novel class of molecular rods based on oligospiroketals (OSK)

Wessig¹,

Merkel²,

Müller³

2015

Beilstein J. Org. Chem.

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SummaryWe developed a new type of molecular rods consisting of two (or more) rigid units linked by a flexible joint. Consequently we called these constructs articulated rods (ARs). The syntheses of ARs were carried out by a flexible and modular approach providing access to a number of compounds with various functionalizations in terminal positions. First applications were presented with pyrene, cinnamoyl and anthracenyl labelled ARs.

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“…However, longer OSK rods suffer from decreasing solubility. This problem could be circumvented by incorporating solubility-enhancing groups in the middle of the rods (called “sleeves”). , These OSK rods have been successfully used as anchors in biological membranes, − linkers in FRET pairs, and building blocks in novel porous materials and dendrimers . Another limitation of OSK rods is the maximum number of ketal moieties.…”

Section: Introductionmentioning

confidence: 99%

Rigid Rod-Based FRET Probes for Membrane Sensing Applications

et al. 2016

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Oligospirothioketal (OSTK) rods are presented as an adjustable scaffold for optical membrane probes. The OSTK rods are readily incorporated into lipid bilayers due to their hydrophobic backbones. Because of their high length-over-diameter aspect ratio, only a minimal disturbance of the lipid bilayer is caused. OSTK rods show outstanding rigidity and allow defined labeling with fluorescent dyes, yielding full control of the orientation between the dye and OSTK skeleton. This allows the construction of novel Förster resonance energy transfer probes with highly defined relative orientations of the transition dipole moments of the donor and acceptor dyes and makes the class of OSTK probes a powerful, flexible toolbox for optical biosensing applications. Data on steady-state and time-resolved fluorescence experiments investigating the incorporation of coumarin- and [1,3]dioxolo[4,5-f][1,3]benzo-dioxole-labeled OSTKs in large unilamellar vesicles are presented as a show case.

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Novel porous materials based on oligospiroketals (OSK)

Cited by 8 publications

References 35 publications

Catalytic activity and stability of carbon supported V oxides and carbides synthesized via pyrolysis of MIL-47 (V)

Catalytic activity and stability of carbon supported V oxides and carbides synthesized via pyrolysis of MIL-47 (V)

Articulated rods – a novel class of molecular rods based on oligospiroketals (OSK)

Rigid Rod-Based FRET Probes for Membrane Sensing Applications

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