Comparison of octadecyl bonded titania phases

Citation
A. Ellwanger et al., Comparison of octadecyl bonded titania phases, CHROMATOGR, 49(7-8), 1999, pp. 424-430
Citations number
27
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Chemistry & Analysis","Spectroscopy /Instrumentation/Analytical Sciences
Journal title
CHROMATOGRAPHIA
ISSN journal
0009-5893 → ACNP
Volume
49
Issue
7-8
Year of publication
1999
Pages
424 - 430
Database
ISI
SICI code
0009-5893(199904)49:7-8<424:COOBTP>2.0.ZU;2-O
Abstract
The structure of a C-18 phase based on titania (C-18-A), synthesized by the method of solution polymerization, is investigated by diffuse reflectance infrared Fourier transform (DRIFT) and solid-state nuclear magnetic resonan ce (NMR) spectroscopy. The findings are compared with the results of a seco nd C-18 phase based on titania (C-18-B) which was synthesized by the method of surface hydrosilation. The dynamic behavior of both phases is examined by H-1 NIAS NMR detection of spin-lattice relaxation times in the rotating frame (T-1pH) and conventional spin-lattice relaxation times (T-1). Due toe smaller ligand density, phase C-18-A appears to be a somewhat mure mobile than phase C-18-B. The chromatographic capability of the phase C-18-A is demonstrated by the s eparation of samples containing benzene derivates or anilines. The elution order is analogous to the phase C-18-B, but for both test mixtures the pola rity of the mobile phase has to be increased. Phase C-18-A is classified as being polymeric by the Sander and Wise test, whereas phase C-18-B shows in termediate retention behavior.