H-2 NUCLEAR-MAGNETIC-RESONANCE INVESTIGATIONS OF THE DYNAMICS OF ALKYL-MODIFIED SILICA IN THE PRESENCE OF SOLVENT, SURFACTANT, AND MESOGENIC MOLECULES

被引:31
作者
GANGODA, ME [1 ]
GILPIN, RK [1 ]
机构
[1] KENT STATE UNIV,DEPT CHEM,KENT,OH 44242
关键词
D O I
10.1021/la00095a009
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Specifically deuterated dodecyltrichlorosilane, (Cl3Si(CH2)10CD2CH3), was synthesized and reacted with porous chromatographic grade silica to obtain a labeled alkyl-modified surface. Subsequently, 2H NMR quadrupole echo spectra were recorded, and spin-lattice relaxation times (T1) were calculated for the material in the presence of organic and hydroorganic solvents, an aqueous surfactant solution, and the nematic phase of a thermotropic liquid crystal. Line width, shape, and T1 were sensitive to changes in the interfacial conditions. The spin-lattice relaxation rate (T1-1) was found to be linearly related to the square of the line width at its half-height (Δki/22). These results suggest that the motional averaging process for the C-2H bond is a combination of fast and intermediate molecular fluctuations similar to those observed in other restricted systems such as lipid bilayers and micellar systems. © 1990, American Chemical Society. All rights reserved.
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页码:941 / 944
页数:4
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