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  • 1
    Electronic Resource
    Electronic Resource
    Regularities in the retention of isomeric aromatic hydrocarbons in liquid chromatography II. Analysis of polymethyl- and monoalkylbenzenes on silanized silica gel (1981)
    Springer
    Chromatographia 14 (1981), S. 638-640 
    Details
    ISSN: 1612-1112
    Keywords: Liquid chromatography ; Aromatic hydrocarbons ; Molecular structure ; Influence on retention
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The regularities of the retention of polymethyl- and monoalkylbenzenes on a nonpolar adsorbent (silanized silica gel) with a polar eluent (2∶3 isopropanol-water) have been studied. In contrast to the retention of the same compounds on a polar adsorbent (silica gel with hydroxylated surface) and with a nonpolar eluent (hexane) polymethylbenzenes are retained on silanized silica gel for a shorter time than the corresponding monoalkylbenzene isomers. The retention order of tert.-, sec.- and n-butylbenzenes is the reverse of that observed on silica gel having a hydroxylated surface. The retention order of xylenes, trimethyl- and tetramethylbenzenes is also the reverse of their retention order on silica gel having a hydroxylated surface. All the mixtures of the corresponding homologues and isomers have been separated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02291103
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Retention of diphenyls, terphenyls, phenylalkanes and fluorene on graphitized thermal carbon black (1981)
    Springer
    Chromatographia 14 (1981), S. 510-514 
    Details
    ISSN: 1612-1112
    Keywords: Gas-solid chromatography ; Graphitized carbon black ; Aromatic hydrocarbons
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary This paper defines values of retention volumes for zero surface coverage (Henry's constant) at different temperatures, retention indices and variations of the internal energy (differential heats of adsorption) of diphenyl and its alkyl derivatives, terphenyls, diphenylmethane, triphenylmethane, diphenylethanes and fluorene on graphitized thermal carbon black (GTCB). Adsorption on GTCB takes place in accordance with the geometry of these molecules, the strongest adsorption being observed for para-terphenyl with least inhibited internal rotation of the molecule, while the weakest adsorption occurs for 2,6,2′,6′-tetramethyldiphenyl with the most inhibited internal rotation of the molecules. The flat molecules of fluorene are adsorbed on GTCB more readily than the nonflat molecules of diphenylmethane.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02265630
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Chromatoscopic determination of the geometric parameters of indane hydrocarbon molecules (1981)
    Springer
    Chromatographia 14 (1981), S. 107-109 
    Details
    ISSN: 1612-1112
    Keywords: Gas-adsorption chromatography ; Structure of molecules ; Indane, methylindanes ; Chromatoscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A molecular statistical calculation of the retention volumes at zero surface coverage on graphitized thermal carbon black using the atom-atom approximation for the potential energy of intermolecular interaction between adsorbate and adsorbent has been carried out for different structure models of indane, 2-methylindane and 5-methylindane molecules. By comparing the results of the calculations with measured retention volumes, plausible models have been chosen for the structure of the molecules studied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02279521
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    A chromatoscopic study of fluorene, indenes and styrene (1982)
    Springer
    Chromatographia 15 (1982), S. 245-248 
    Details
    ISSN: 1612-1112
    Keywords: Chromatoscopy ; Gas chromatography ; Graphitized carbon black ; Molecular structure and retention ; Aromatic hydrocarbons
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A molecular-statistical calculation of the retention volumes at zero sample size on graphitized thermal carbon black is carried out for quasi-rigid molecules of fluorene, indene, 1-methylindene, 2-methylindene and three dimethylindenes. A reasonable agreement is observed between the calculated and the available experimental gas chromatographic data. The potential barrier to internal rotation and the torsional angle in styrene molecules are estimated by comparing theoretically calculated and measured retention volumes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02265656
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Chromatographic measurements and molecular statistical calculations of thermodynamic characteristics of adsorption of aromatic and polycyclic hydrocarbons on graphitized thermal carbon black (1979)
    Springer
    Chromatographia 12 (1979), S. 799-802 
    Details
    ISSN: 1612-1112
    Keywords: Gas-solid chromatography ; Gas-adsorption chromatography ; Henry's constants measurements, calculations ; Aromatic, cyclic hydrocarbons ; Chromatoscopy of tetralin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Retention volumes at zero sample size (Henry's constants) on graphitized thermal carbon black have been measured at a number of temperatures for benzene, all its methyl-substituted and some of alkyl-substituted derivatives, naphthalene, diphenyl, phenanthrene, anthracene, tetralin, cis- and trans-decalin, cyclohexane, adamantane and diamantane. The earlier published thermodynamic characteristics of adsorption of the aromatic hydrocarbons have been revised. A molecular statistical calculation of thermodynamic characteristics of adsorption using the atom-atom approximation for the energy of intermolecular interaction between adsorbate and adsorbent has been carried out for polycyclic hydrocarbons: adamantane, diamantane, cis- and trans-decalin. The measured retention volumes of tetralin have been used for the calculation of some parameters of geometric structure of the molecule.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02260661
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    Paper (German National Licenses)
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