Synthesis and self-assembly of donor-spacer-acceptor molecules. Liquid crystals formed by single-component "complexes" via intermolecular hydrogen-bonding interaction

被引:51
|
作者
Xu, JW
Toh, CL
Liu, XM
Wang, SF
He, CB
Lu, XH
机构
[1] Inst Mat Res & Engn, Singapore 117602, Singapore
[2] Nanyang Technol Univ, Sch Mat Engn, Singapore 639798, Singapore
关键词
D O I
10.1021/ma047999l
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
A series of donor-spacer-acceptor molecules, 4-{[n-(4-stilbazoyl)] alkyloxy}benzoic acid, where n is the number of carbon atoms in alkyloxy chain and equals to 6, 8, 10, and 12, respectively, for 6a-d, were synthesized. The molecular "complexes" formed by identical 6a-d molecules generated hydrogen-bonded liquid-crystalline polymers by connecting a rigid donor and a rigid acceptor of the molecules via hydrogen-bonding interaction. The thermal behaviors were studied by differential scanning calorimetry, polarizing microscopy and X-ray diffraction. The phase transition temperature of 6a-d on both cooling and heating decreased steadily with the increase in length of the spacer. The hydrogen-bonding interaction in 6a-d was investigated by X-ray photoelectron spectroscopy and FT-IR spectroscopy. The intermolecular hydrogen-bonding interaction was evidenced by the fact that there were two characteristic bands at 2450 and 1920 cm(-1) in the FT-IR spectra and the change in binding energy of N 1s by 0.72-0.88 eV relative to its reference compound trans-4-octyloxy-4'-stilbazole (7) were observed.
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页码:1684 / 1690
页数:7
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