3D10 シクロトリホスファゼン誘導体の^<31>P及び^<13>C NMR : 配向特性と遮蔽異方性

概要

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^<31>P and ^<13>C NMR are observed for a smectic A phase of hexakis(4-(4'-dodecyl)-biphenoxy)cyclotetraphosphazene. In an intense magnetic field, the long axes of biphenylene fragments and alkyl chains align along the magnetic field, and the cyclotriphosphazene(ctp) ring-normal points preferentially at the same direction. Orientational order parameter for inorganic moiety (ctp fragment) and that for organic moiety (biphenylene fragment) are determined independently from ^<31>P and ^<13>C NMR spectroscopies. The two order parameters are revealed to take the same value of 0.45. which is smaller than that of the conventional smectic A liquid crystals consisting of small organic molecules. Contrasting shielding axis for ^<31>P lies on the ctp ring normal, while that for aromatic ^<13>C lies along the line connecting the two phenylene rings.
日本液晶学会の論文
2001-09-24