Sorbtion and selective properties of supramolecular liquid crystal–β-cyclodextrin sorbent under conditions of gas chromatography

Onuchak, L. A.; Tugareva, D. A.; Kapralova, T. S.; Kuraeva, Yu. G.; Kuvshinova, S. A.; Burmistrov, V. A.

doi:10.1134/s2070205115060155

Cited by 9 publications

(8 citation statements)

References 7 publications

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“…Therefore, the separation ability of the LCSPs is often estimated on the basis of the ability to separate the xylene isomers in these phases. However, the lack of separation of meta - and para -isomers of xylene has not meant that the LCSP does not possess good separation properties towards the mixtures of other isomers [ 31 – 35 ] (Fig. 1 ).…”

Section: Liquid Crystals Stationary Phases In Gcmentioning

confidence: 99%

“…Chiral compounds can be separated using chiral stationary phases, including the chiral LC stationary phases. The LCSP, which deserve the chromatographists’ vigilance, is just chiral smectic (S)-2-methylbutyl 4-(4-decyloxybenzylideneamino)cinnamate and 4-(3-hydroxypropyloxy)-4′-formylazobenzene and β -cyclodextrin (DOBAMBC and HPOFAB- β -CD, respectively—see “ Appendix: The Characteristics of Liquid Crystals Investigated as Stationary Phases ”) [ 34 , 35 ]. Alcohols, aldehydes, n -alkanes, arenes, and optical isomers have been separated on this LCSP.…”

Section: Liquid Crystals Stationary Phases In Gcmentioning

confidence: 99%

“…According to the authors [ 35 ], the introduction of nonmesogenic chiral addition of β -CD in an amount of 10 wt% (2.8 mol %) into HPOFAB did not induce the chiral twisted smectic phase, . A decrease in the melting point and widening of the temperature range of the existence of the S A achiral phase due to the disappearance of the nematic phase was only observed.…”

Section: Liquid Crystals Stationary Phases In Gcmentioning

confidence: 99%

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Liquid Crystals as Stationary Phases in Chromatography

et al. 2016

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The most correct analysis of the compositions of diverse analytes mixtures is significant for analytical studies in different fields; however, many prevalent analytes cannot be identified employing traditional partition gas chromatographic methods. Thus, the increasing requirements on analytes of isomeric compounds and the problems encountered in their separation demand a study of more diverse analytical systems which are characterised by higher selectivity. Therefore, the selectivity and polarities of various liquid crystals (rod-like, banana-shape, biforked, oxygen, sulphur, nitrogen, and metal containing molecules, Schiff-base, and polymeric dendrimers) employed as liquid crystalline stationary phases (LCSPs) have been discussed from both points of views, namely, their analytical applications and thermodynamic characteristics of infinitely diluted probes with different acceptor–donor properties. Extreme particular effort has been paid to the different interdependencies between the bound up chemical structures of liquid crystal molecules with their different acceptor–donor properties and the connected resolution capabilities in the interpretation of the probe—LCSP systems, on the basis of the and dependencies, with regard to the LCSP compositions, which have been controlled by the counterbalancing of the enthalpy and entropy factors. The properties of binary systems composed of liquid crystalline poly(propyleneimine) dendrimers—rod-like molecules of liquid crystals and effects of the dendrimer structure, the chemical nature, and molecular size of the non-mesogens on the ability to dissolve in the liquid crystalline phases, have been interpreted. Practical applications of metallomesogenes and chiral stationary phases for analytical separation of different organic substances have also been taken into consideration.

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Section: Liquid Crystals Stationary Phases In Gcmentioning

confidence: 99%

Section: Liquid Crystals Stationary Phases In Gcmentioning

confidence: 99%

Section: Liquid Crystals Stationary Phases In Gcmentioning

confidence: 99%

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Liquid Crystals as Stationary Phases in Chromatography

et al. 2016

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“…Inverse gas chromatography is one of the methods of studying the interactions between gas molecules and solids [3][4][5]. This method allows to calculate the thermodynamic characteristics of adsorption [6][7][8], to estimate the polarity of the surface and the contributions of various interactions to the adsorption energy [9][10][11][12], and also to obtain adsorption isotherms and calculate the monolayer capacity and the specific surface area of solids [5,13,14]. Therefore, the aim of this work is to study the polarity of polyarylenephthalates surface by inverse gas chromatography.…”

Section: Introductionmentioning

confidence: 99%

Intermolecular interactions between polyarylenephthalides surface and organic compounds of different nature by inverse gas chromatography data

et al. 2019

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Polyarylenephthalides are a promising class of polymeric materials. They are soluble in organic solvents, but remain resistant to water, as well as to acids and bases. All this makes polyarylenphthalide promising materials for the formation of films on surfaces. However, for this it is necessary to first study the ability of polyarylenephthalides to different intermolecular interactions, as well as the polarity of their surface.Therefore, it is of interest to use the inverse gas chromatography method for studying the adsorption properties of the surface of polyarylenephthalates, as well as the evaluation of its conditional polarity. Two polymers of the class of polyarylenephthalides were used as the studied samples: chlorinated (in position 4) poly phthalidylidenefluorene) (OPS-236) and poly (phthalidylidene diphenyl) (PE-259). They are distinguished by the presence of a methylene group between two benzene rings. Inert solid support Chromaton NAW was used as a solid substrate for the deposition of polyarylenphthalide films. The application was carried out from chloroform by evaporation of the solvent at a temperature of 40 ° C. The amount of the applied polymer was 1% by weight of the inert carrier. The study was conducted by the method of inverse gas chromatography. Samples were introduced as diluted vapor-air mixtures at the limit of the detector sensitivity. This made it possible to measure the retention parameters in the Henry region and consider the interactions between sorbate molecules to be negligible. The relative conditional polarity of the surface and the contributions of various intermolecular interactionsto adsorption free energy were estimated by the method of linear free energy relationship (LFER). From the obtained LFER-coefficients, the contributions of intermolecular interactions to the adsorption energy were calculated, and the relative conditional polarity of the surface was also estimated. The dispersion and specific component of the Helmholtz free energy of adsorption was calculated by the Dong method. It has been established that adsorbents based on polyarylenephthalides are able to act as stationary phases for chromatography. It is shown that polyarylenephthalide films are capable of both dispersion and various specific interactions with organic molecules. The surface of polyarylenephthalides can be attributed to stationary phases of medium polarity, more polar than porous polymers based on styrene and divinylbenzene and less polar than silica gels.

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“…Separation and detection of isomers is the most complex task of the modern day analytical chromatography that is important for organic chemistry, biochemistry, chemical, pharmaceutical and biotechnological industries. One of the methods for obtaining universal isomer-selective sorbents (stationary phases) in gas-liquid chromatography is the use of binary systems based on achiral liquid crystals (LC) and cyclodextrins (CD) [1][2][3]. The LC matrix of such stationary phases facilitates the separation of structural isomers, while the cyclodextrins dissolved in it facilitate the separation of optical isomers due to the difference in the stability of the sorbate-macrocycle binding complexes.…”

Section: Introductionmentioning

confidence: 99%

Isomer-Selective Properties of Carbon Adsorbent Modified by "4-n-octyloxy-4'-cyanobiphenyl – β-Cyclodextrin" under Gas-Adsorption Chromatography Conditions

Kopytin¹,

Bykov²,

Sinkov³

et al. 2018

Liq. Cryst. and their Appl.

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The isomer-selective properties of the carbon adsorbent Carbopack Y modified by successively applied immiscible monolayers of 4-n-octyloxy-4'-cyanobiphenyl mesogen and β-cyclodextrin have been studied. It has been shown that the bilayer modified adsorbent has a high selectivity to structural and optical isomers under the conditions of the gas-adsorption chromatography. Thermodynamic justification of the selectivity and its temperature dependence has been given. Compensation temperatures for the reversal of the isomer conversion from the chromatographic column have been calculated.

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Sorbtion and selective properties of supramolecular liquid crystal–β-cyclodextrin sorbent under conditions of gas chromatography

Cited by 9 publications

References 7 publications

Liquid Crystals as Stationary Phases in Chromatography

Liquid Crystals as Stationary Phases in Chromatography

Intermolecular interactions between polyarylenephthalides surface and organic compounds of different nature by inverse gas chromatography data

Isomer-Selective Properties of Carbon Adsorbent Modified by "4-n-octyloxy-4'-cyanobiphenyl – β-Cyclodextrin" under Gas-Adsorption Chromatography Conditions

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