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CP/MAS NMR investigations of silica gel surfaces modified with aminopropylsilane

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Summary

Aminopropyl chemically bonded phases for high performance liquid chromatography (HPLC) have been prepared using mono- and trifunctional methoxyor ethoxysilanes. Three types of silica gel with different surface characteristics were used as support for the chemically bonded phases (CBPs). Surface characteristics of the packings before and after chemical modification were determined by porosity parameters, elemental analysis and CP/MAS NMR spectroscopy.29Si and13C CP/MAS NMR investigations gave informations about different interactions between aminosilyl ligands and/or these ligands and/or water molecules condensed in the pores of the silica gel surface. With decreasing pore diameter of the silica gel the proportion of protonated aminopropyl ligand increases.

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Authors and Affiliations

  1. Institut für Organische Chemie der Universität Tübingen, Auf der Morgenstelle 18, 72076, Tübingen, Germany

    K. Albert, R. Brindle, J. Schmid & E. Bayer

  2. Department of Chemical Physics, Faculty of Chemistry, Maria Curie Sklodovska University, 20031, Lublin, Poland

    B. Buszewski

Authors
  1. K. Albert
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  2. R. Brindle
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  3. J. Schmid
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  4. B. Buszewski
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  5. E. Bayer
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Albert, K., Brindle, R., Schmid, J. et al. CP/MAS NMR investigations of silica gel surfaces modified with aminopropylsilane. Chromatographia 38, 283–290 (1994). https://doi.org/10.1007/BF02269769

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  • DOI: https://doi.org/10.1007/BF02269769

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