Chromatographic study of the inclusion properties of cyclodextrins: Study of inclusion from the gaseous phase

Smolková-Keulemansová, Eva; Feltl, L.; Krýsl, Svatopluk

doi:10.1007/bf00687992

Cited by 32 publications

(6 citation statements)

References 20 publications

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“…In 1941 Martin and Synge [53][54][55] described partition chromatography utilizing solvation of solutes in liquid stationary phase as a retention mechanism. Only packed columns were known at that time.…”

Section: Plate Height In a Capillary Columnmentioning

confidence: 99%

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Formation of Peak Widths

Blumberg¹

2010

Temperature‐Programmed Gas Chromatography

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Section: Plate Height In a Capillary Columnmentioning

confidence: 99%

“…25 . 55 and F/F opt,thin ¼ f/f opt,thin $ T À1.1 . (7.60), (7.38) and (6.20), f at fixed pressure is proportional to T Àj .…”

Section: Thick Film Columnsmentioning

confidence: 99%

Formation of Peak Widths

Blumberg¹

2010

Temperature‐Programmed Gas Chromatography

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“…Cyclodextrins are cyclic oligosaccharides and are commonly used as selectors for the separation of enantiomers and other isomers in GC [25- separation of hydrocarbon structural isomers ( 2 C,) by packed column gas chromatography was accomplished by Smolkov6-Keulemansov6, et al using a Chromosorb W support coated with a-and P-cyclodextrin dissolved in dimethylformamide [45,46]. In addition to alkanes, halogenated alkanes, alcohols, and alkyl aromatics were separated as well [47,48].…”

Section: Gasmentioning

confidence: 99%

“…Cyclodextrins are cyclic oligosaccharides and are commonly used as selectors for the separation of enantiomers and other isomers in GC [25- [45,46]. In addition to alkanes, halogenated alkanes, alcohols, and alkyl aromatics were separated as well [47,48].…”

Section: Gasmentioning

confidence: 99%

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Cyclodextrin PLOT columns for the gas‐solid chromatographic separation of light hydrocarbons and inorganic gases

Reid

Armstrong

1994

J Microcolumn Separations

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Abstract. Alpha and beta cyclodextrin (a-and /3-CD) were chemically bonded to porous layer fused silica open tubular columns and used as gas-solid chromatographic (GSC) stationary phases for the separation of Cl to C6 hydrocarbons and a variety of inorganic gases. In general, these cyclodextrin PLOT columns were superior to the analogous packed columns. The capillary columns show similar selectivities with an increase in efficiency and number of theoretical plates over the packed columns. The cyclodextrin stationary phases show good selectivities toward the light hydrocarbons and inorganic gases on capillary columns as short as ten meters. Subambient temperatures allow the baseline resolution of oxygen from nitrogen. These columns have been effectively utilized at temperatures up to 260°C without loss of efficiency or degradation of selectivity.

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Carbon‐Supported Ruthenium Nanoparticles Stabilized by Methylated Cyclodextrins: A New Family of Heterogeneous Catalysts for the Gas‐Phase Hydrogenation of Arenes

Denicourt‐Nowicki

Roucoux

Wyrwalski

et al. 2008

Chemistry A European J

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Carbon-supported metal catalysts are widely used in heterogeneous catalysis.[1] Indeed, the carbonaceous materials satisfy most of the desirable requirements for a catalytic support, such as chemical inertness, stability, high surface area, and easy recovery of the metal phase by burning off the spent catalyst. However, the inert nature of the carbonaceous surfaces sometimes makes it difficult to deposit metals, leading to mediocre dispersions of the metallic phase without narrow size distribution. [2] To overcome these difficulties, carbon-supported nanoparticles prepared by the deposition of stabilized metal colloids onto carbon supports have received considerable attention over the past decade.[3] The stabilization of the colloidal metallic species requires the addition of a protective agent to prevent the aggregation of the colloids into bulk materials. Several articles have offered highly detailed reviews of the specific synthesis techniques for preparing nanoparticles by chemical methods. [4] Concurrently to the stabilization of nanoparticle suspensions, it appears also crucial to consider the affinity of stabilized colloids for the carbon surface to obtain well-defined carbon-supported nanoparticles.As cyclodextrins (CDs) are known to adsorb spontaneously onto carbonaceous supports [5] and to stabilize metal nanoparticles, [6] we envisaged combining these properties to synthesize new selective heterogeneous catalysts for gas-phase hydrogenation reactions. In fact, we speculated that the anchorage of the metallic nanoparticles on the organic support would be easier in the presence of CD and that these CDs could induce new selectivities through molecular recognition processes. The specific size, shape, and hydrophobic environment of the CD cavity could, for example, enforce the substrates to adopt conformations that are either not or less populated in the proximity of the metal surface or stabilize certain reactive intermediates. Among the different cyclodextrins described in the literature, the randomly methylated cyclodextrins (RaMe-CDs; Scheme 1) appear to be the best candidates to validate our concept. Indeed, we have recently demonstrated that these methylated CDs can stabilize efficiently Ru 0 nanoparticles in water and that these CD-capped nanoparticles catalyze the hydrogenation of aromatic compounds in water.[6 g] Furthermore, we have recently discovered that RaMe-CDs can be easily adsorbed on carbon supports (see Supporting Information).[7]The carbon-supported ruthenium nanocatalysts were prepared from CD-stabilized aqueous colloidal suspensions, which were obtained by the chemical reduction of ruthenium chloride, followed by their adsorption onto the charcoal support (Scheme 1). The solids are denoted Ru-x-RaMe-

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Chromatographic study of the inclusion properties of cyclodextrins: Study of inclusion from the gaseous phase

Cited by 32 publications

References 20 publications

Formation of Peak Widths

Formation of Peak Widths

Cyclodextrin PLOT columns for the gas‐solid chromatographic separation of light hydrocarbons and inorganic gases

Carbon‐Supported Ruthenium Nanoparticles Stabilized by Methylated Cyclodextrins: A New Family of Heterogeneous Catalysts for the Gas‐Phase Hydrogenation of Arenes

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