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  • Analytical Chemistry and Spectroscopy  (3)
  • hydrosilation  (1)
  • molecular shape recognition  (1)
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  • 1
    Digitale Medien
    Digitale Medien
    Methods for the Modification and Characterization of Oxide Surfaces (1997)
    Springer
    Interface science 5 (1997), S. 103-117 
    Details
    ISSN: 1573-2746
    Schlagwort(e): silica ; organosilanization ; hydrosilation ; DRIFT ; CP-MAS NMR ; ESCA
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Abstract This paper presents a general overview of the chemical modificationof oxide surfaces with particular emphasis on the silanization/hydrosilationmethod. A number of materials have been synthesized that have hydrophobic,hydrophilic, chiral and liquid crystal surfaces. The most frequently usedoxide in these materials is silica with chromatography as the primaryapplication for the chemically modified oxide surfaces. Also presented is anoverview of a number of methods used to characterize modified oxide surfacessuch as elemental analysis, diffuse reflectance infrared Fourier transformspectroscopy, solid-state NMR, electron spectroscopy for chemical analysis,scanning electron microscopy and atomic force microscopy. The particularadvantages of each method for the characterization of modified oxidematerials are discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1008648923962
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  • 2
    Digitale Medien
    Digitale Medien
    Molecular shape recognition of polycyclic aromatic hydrocarbons with a liquid-crystal bonded phase in supercritical fluid chromatography (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Microcolumn Separations 3 (1991), S. 417-422 
    Details
    ISSN: 1040-7685
    Schlagwort(e): molecular shape recognition ; PAH ; liquid crystal ; SFC ; LC ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The chromatographic characteristics of a liquid crystal bonded phase have been evaluated for the separation of polycyclic aromatic hydrocarbons (PAHs), especially focusing on its shape recognition capability in supercritical fluid chromatography (SFC). The results clearly indicate that the phase has a stronger molecular planarity and shape recognition capability than typical polymeric and monomeric octadecylsilica (ODS) phases because of the very ordered bonded phase structure. The recognition capability was slightly dependent on SFC conditions such as column pressure, column temperature, and mobile phase density. Modifier addition did not make a large difference on the recognition capability. The phase seems to be a very promising stationary phase in SFC because the recognition capability is slightly influenced by the SFC conditions. Selectivity enhancement for molecular shape and planarity recognition has been found in SFC compared to reversed-phase LC separations with the same stationary phase.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/mcs.1220030506
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  • 3
    Digitale Medien
    Digitale Medien
    Separation of fullerenes with liquid crystal bonded silica phases in microcolumn high performance liquid chromatography (1995)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Microcolumn Separations 7 (1995), S. 41-49 
    Details
    ISSN: 1040-7685
    Schlagwort(e): fullerenes ; liquid crystal bonded phases ; microcolumn liquid chromatography ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The liquid chromatographic separation of C60 and C70 fullerenes with liquid crystal bonded silica phases was carried out and the separation performance was evaluated with various mobile phase compositions and column temperatures. The results clearly indicate that one liquid crystal bonded phase possesses better retention capability and separation power for these fullerene molecules than commercially available octadecylsilica (ODS) phases. The capacity factors of C60 and C70 were 2.82 and 8.46, respectively, with n-hexane as the mobile phase.In contrast to the normal temperature dependency of the retention of some polycyclic aromatic hydrocarbons (PAHs) versus column temperature, unusual behaviors for C60 and C70 have been observed with the liquid crystal phase.
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/mcs.1220070107
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  • 4
    Digitale Medien
    Digitale Medien
    Nuclear magnetic resonance spectroscopy of Schiff bases: II - imines extracted from aqueous solution (1976)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 8 (1976), S. 173-176 
    Details
    ISSN: 0030-4921
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Nuclear magnetic resonance spectroscopy is used to study netural imines formed from various aldehydes and primary amines in aqueous solution. The imines are then extracted into CDCl3 and their formation constants in the aqueous phase are calculated as a function of pD. The results are in agreement with previous studies. Decoupling experiments are used to prove that additional splitting of the proton spectrum is due to long range coupling rather than syn-anti isomerism. The possibility of utilizing the formation of Schiff bases in aqueous solution for synthetic purposes is discussed and the 13C magnetic resonance spectrum of the imine, isolated from the reaction of 2-thiophenecarbaldehyde and n-butylamine, is reported.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/mrc.1270080402
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