Issue 5, 1988

Nuclear magnetic resonance study of molecules in anisotropic systems. Part 9. Solution structure and preferred orientation of myo-inositol in a lyotropic liquid crystal

Abstract

1 H.N.m.r. spectra of myo-inositol have been measured in a lyotropic liquid crystal containing potassium laurate. Variable-temperature experiments revealed an increased participation of direct couplings in the spectra on lowering the temperature of a sample from an isotropic phase. Analysis of the ordered spectra obtained at 28 and 22 °C afforded values for the direct couplings between protons. The distance ratio r2,6/r3,5 was determined to be 0.92 from the relevant direct couplings. The direct coupling data have been interpreted in terms of a reasonable model of molecular structure; however, a full analysis of the direct couplings to give precise structural and order parameters was unsuccessful because of a relatively low degree of order in the mesophase. The principal axis system for the order tensor differs as much as 34° from that for the moment of inertia; it is therefore suggested that a type of solute–solvent interaction dominates the orientation of myo-inositol. The 1H n.m.r. spectrum of myo-inositol in D2O has also been analysed, to derive the indirect couplings used in the analysis of the ordered spectra.

Article information

Article type
Paper

J. Chem. Soc., Perkin Trans. 2, 1988, 791-794

Nuclear magnetic resonance study of molecules in anisotropic systems. Part 9. Solution structure and preferred orientation of myo-inositol in a lyotropic liquid crystal

H. Fujiwara, J. Hirai and Y. Sasaki, J. Chem. Soc., Perkin Trans. 2, 1988, 791 DOI: 10.1039/P29880000791

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