title: Influence of solvents on the conformational order of C18 alkyl modified silica gels.
abstract: The influence of solvents on the conformational order of C(18) alkyl modified silica gels is studied by means of variable temperature FTIR spectroscopy. Symmetric and anti-symmetric CH(2) stretching modes were utilized for getting qualitative information about the changes in alkyl chain conformational order as a function of both protonated and perdeuterated solvents. It was found that interaction between the C(18) alkyl modified silica gels and the mobile phase results in pronounced changes of the alkyl chain conformational order. Furthermore, it was observed that some perdeuterated solvents exhibit isotope effects, which again is reflected by a different alkyl chain conformational order as compared to the corresponding stationary phases with protonated solvents.
authors.affiliation: Institut für Physikalische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany.
authors.forename: Gokulakrishnan
authors.initials: G
authors.lastname: Srinivasan
authors.forename: Klaus
authors.initials: K
authors.lastname: Müller
mesh_terms: D003903:Deuterium / Q000737:chemistry; D005782:Gels / Q000737:chemistry*; D008968:Molecular Conformation; D011522:Protons; D012821:Silanes / Q000737:chemistry*; D012997:Solvents / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared / Q000379:methods; D013696:Temperature
chemical_list: D005782:Gels; D011522:Protons; D012821:Silanes; D012997:Solvents; C024779:octadecylsilane; D003903:Deuterium