CHARACTERIZATION OF OCTADECYLSILICA STATIONARY PHASES BY SPECTROSCOPIC METHODS

Two spectroscopic methods, solid state NMR and diffuse reflectance FTI R, have been used in conjunction with liquid chromatographic retention data to identify and distinguish the functionality of octadecylsilica (ODS) stationary phases. NMR and FTIR spectra are indicative of vario us features of the different functionalities of the phases and this in formation can be used to elucidate the configuration of the organosily l moiety in the ODS on the silica surface and explain why ODS phases h ave different molecular shape (mainly planarity) recognition capabilit y.