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  • 1
    Electronic Resource
    Electronic Resource
    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
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 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.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270080402
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    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
    Keywords: molecular shape recognition ; PAH ; liquid crystal ; SFC ; LC ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 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.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mcs.1220030506
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    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
    Keywords: fullerenes ; liquid crystal bonded phases ; microcolumn liquid chromatography ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 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.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mcs.1220070107
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Column technology in capillary electrophoresis and capillary electrochromatography (1997)
    Weinheim : Wiley-Blackwell
    Electrophoresis 18 (1997), S. 2228-2238 
    Details
    ISSN: 0173-0835
    Keywords: Surface modifications ; Microchips ; Column packings ; Etching ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: A review of column technology in capillary electrophoresis (CE) including wall modification processes and open tubular as well as packed column formats in capillary electrochromatography (CEC) are presented. There are many approaches which can be used to solve separation problems which provide higher efficiency and/or shorter analysis times in comparison to other chromatographic techniques. However, both CE and CEC are still relatively undeveloped in comparison to a more mature method such as high performance liquid chromatography (HPLC) and improvement in column technology is changing rapidly.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elps.1150181213
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    Paper (German National Licenses)
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