Chain order and mobility of high-density c(18) phases by solid-state NMR spectroscopy and liquid chromatography

Analytical Chemistry
M PurschK Albert

Abstract

C(18) phases prepared by different synthetic pathways are examined by solid-state NMR spectroscopy. Silane functionality is clearly indicated by (29)Si CP/MAS NMR spectroscopy. Order and mobility of the alkyl chains are investigated with high-speed (1)H MAS and (13)C CP/MAS NMR spectroscopy. Differences in coverage are monitored by (1)H line widths,( 13)C chemical shifts, (13)C cross-polarization constants, and (1)H relaxation times in the rotating frame. It is shown that C(18) phases prepared by the surface polymerization technique exhibit a more regular surface coverage than sorbents prepared by conventional polymeric synthesis. The findings from solid-state NMR investigations are discussed in the context of liquid chromatography (LC) separations of linear and bulky polycyclic aromatic hydrocarbon (PAH) solutes.

Citations

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Mar 17, 2005·Analytical and Bioanalytical Chemistry·Christopher J Orendorff, Jeanne E Pemberton
May 25, 2010·Analytical and Bioanalytical Chemistry·Jesse O OmamoghoK Albert
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Related Concepts

Alkylating Agents
Liquid Chromatography
Physiological Aspects
Polycyclic Hydrocarbons, Aromatic
Polymers
Surface
Chemicals
Fluorine-18
Spectroscopy, Nuclear Magnetic Resonance
Establishment of Cell Polarity

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