Abstract
Reversed-phase chromatographic surfaces were prepared by reacting Cl(CH 3) 2Si(CH 2) 11 ∗CH with porous silica particles. Spin-lattice relaxation and nuclear Overhauser enhancement (NOE) were measured for the labeled methyl carbon in the presence of various solvents. T 1 was inversely proportional to solvent viscosity (η) and fitted one of two linear relationships. In all cases, reduced NOE values were observed, but there was no statistically significant correlation between NOE and η. Both T 1 and NOE data suggest anisotropic motion of the bonded alkyl chains. Likewise, the data provide information about the microscopic chain environment and the degree of ligand extension.
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