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Conformational analysis of the alkyl spacer of a dimer liquid crystal in the solid and liquid crystalline states by 13 C– 13 C dipolar coupling
Author(s) -
Shimizu Renato Norio,
Asakawa Naoki,
Ando Isao,
Abe Akihiro,
Furuya Hidemine
Publication year - 1998
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/(sici)1097-458x(199806)36:13<s195::aid-omr313>3.0.co;2-0
Subject(s) - chemistry , alkyl , liquid crystal , dimer , conformational isomerism , crystallography , solid state , saturation (graph theory) , dipole , molecule , organic chemistry , physics , mathematics , combinatorics , optics
The conformation around the C ε —C ε′ bond of the alkyl spacer of α,ω‐bis[(4,4′‐cyanobiphenylyl)oxy]decane (CBA‐10) was evaluated in the solid and liquid crystalline states through the detection of the dipolar interaction between C δ and C δ′ . CBA‐10 13 C‐labelled in the δ position of the alkyl spacer was prepared and for the measurement in the solid state a variation of the Carr–Purcell–Meiboom–Gill 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. © 1998 John Wiley & Sons, Ltd.