NUCLEAR MAGNETIC RESONANCE SPECTROMETRY OF ALKYL LIGANDS IMMOBILIZED ON REVERSED-PHASE LIQUID CHROMATOGRAPHIC SURFACES.

Article abstract of DOI:10.1021/ac00272a060

Reversed-phase chromatographic surfaces were prepared with **1**3C enrichment at the terminal and adjacent carbon positions as well as the fourth carbon position by using labeled n-alkylchlorosilanes. In all cases single resonances were observed arising from the site of the enrichment. Similar values for chemical shift were noted before and after bonding for the terminal methyl and adjacent methylene carbons. For a given surface coverage measured **1**3C spin-lattice relaxation times were relatively constant for the terminal methyl carbon for the various midrange chain lengths studied. However, a decrease in spin-lattice relaxation time was noted with increasing alkyl surface density.