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Conformational analysis of the alkyl spacer of a dimer liquid crystal in the solid and liquid crystalline states by 13C–13C dipolar coupling

✍ Scribed by Renato Norio Shimizu; Naoki Asakawa; Isao Ando; Akihiro Abe; Hidemine Furuya

Publisher
John Wiley and Sons
Year
1998
Tongue
English
Weight
271 KB
Volume
36
Category
Article
ISSN
0749-1581

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✦ Synopsis

The conformation around the bond of the alkyl spacer of a,u-bis[(4,4@-cyanobiphenylyl)oxy] C

e ÈC e@ decane (CBA-10) was evaluated in the solid and liquid crystalline states through the detection of the dipolar interaction between and CBA-10 13C-labelled in the d position of the alkyl spacer was prepared and for the C d C d@ . measurement in the solid state a variation of the CarrÈPurcellÈMeiboomÈGill sequence was used. The spectra in the nematic state were measured with the pulse saturation method. It was concluded that in the solid state the trans conformation is assumed whereas in the liquid crystalline state the fraction of the trans conformers is around 0.6.

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