TY - JOUR
T1 - π-selective stationary phases : (II) adsorption behaviour of substituted aromatic compounds on n-alkyl-phenyl stationary phases
AU - Stevenson, Paul G.
AU - Gritti, Fabrice
AU - Guiochon, Georges
AU - Mayfield, Kirsty J.
AU - Dennis, Gary R.
AU - Shalliker, R. Andrew
PY - 2010
Y1 - 2010
N2 - The frontal analysis method was used to measure the adsorption isotherms of phenol, 4-chlorophenol, p-cresol, 4-methoxyphenol and caffeine on a series of columns packed with home-made alkyl-phenyl bonded silica particles. These ligands consist of a phenyl ring tethered to the silica support via a carbon chain of length ranging from 0 to 4 atoms. The adsorption isotherm models that fit best to the data account for solute-solute interactions that are likely caused by π-π interactions occurring between aromatic compounds and the phenyl group of the ligand. These interactions are the dominant factor responsible for the separation of low molecular weight aromatic compounds on these phenyl-type stationary phases. The saturation capacities depend on whether the spacer of the ligands have an even or an odd number of carbon atoms, with the even alkyl chain lengths having a greater saturation capacity than the odd alkyl chain lengths. The trends in the adsorption equilibrium constant are also significantly different for the even and the odd chain length ligands.
AB - The frontal analysis method was used to measure the adsorption isotherms of phenol, 4-chlorophenol, p-cresol, 4-methoxyphenol and caffeine on a series of columns packed with home-made alkyl-phenyl bonded silica particles. These ligands consist of a phenyl ring tethered to the silica support via a carbon chain of length ranging from 0 to 4 atoms. The adsorption isotherm models that fit best to the data account for solute-solute interactions that are likely caused by π-π interactions occurring between aromatic compounds and the phenyl group of the ligand. These interactions are the dominant factor responsible for the separation of low molecular weight aromatic compounds on these phenyl-type stationary phases. The saturation capacities depend on whether the spacer of the ligands have an even or an odd number of carbon atoms, with the even alkyl chain lengths having a greater saturation capacity than the odd alkyl chain lengths. The trends in the adsorption equilibrium constant are also significantly different for the even and the odd chain length ligands.
UR - http://handle.uws.edu.au:8081/1959.7/553013
U2 - 10.1016/j.chroma.2010.04.064
DO - 10.1016/j.chroma.2010.04.064
M3 - Article
SN - 0021-9673
VL - 1217
SP - 5365
EP - 5376
JO - Journal of Chromatography A
JF - Journal of Chromatography A
IS - 33
ER -