Organogels from unsymmetrical pi-conjugated 1,3,4-oxadiazole derivatives

	Organogels from unsymmetrical pi-conjugated 1,3,4-oxadiazole derivatives
	Zhao C. X.; Wang H. T.; Bai B. L.; Qu S. N.; Song J. X.; Ran X.; Zhang Y.; Li M.
	2013
发表期刊	New Journal of Chemistry
ISSN	ISBN/1144-0546
卷号	37 期号:5
摘要	In this study, the unsymmetrical pi-conjugated gelators, 2-(3,4-bis(alkoxy)phenyl)-5-(pyridine-4-yl)-1,3,4-oxadiazole [4-POXD-Bn (n = 4, 8, 12)], were synthesized and screened for gelation in various solvents. The tendencies of the critical gelation concentration (CGC) and the gel-sol phase transition temperatures (T-gel) of the 4-POXD-B8 gels, as well as the relationship between the end-chain length of gelator and gelation ability, indicated that the solvophobic effect has a critical role in gelation. For the specific gelator that we studied, we observed that the strength of the solvophobic force was related to the solvent properties. The solvent effect on gelation was studied quantitatively using the solvent polarity parameters: polar solubility parameter (delta(a)), dielectric constant (epsilon), and polarity parameter (E-T(30)). The results revealed that the favorable delta(a) domain and E-T(30) domain for the gelation of 4-POXD-B8 was in the range of 8.1-12.6 (cal cm(-3))(1/2) and 43.3-55.7 kcal mol(-1), respectively. Meanwhile, a decrease of delta(a) and E-T(30) in the solvents is unfavorable for gelation. Furthermore, the solvent effect on the microstructure of the gels was studied via scanning electron microscopy (SEM). The SEM images revealed that the gels from 4-POXD-B8 in DMSO and DMF were composed of helical ribbons, whereas those formed in other solvents consisted of flat ribbons.
收录类别	SCI
文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/40804
专题	中科院长春光机所知识产出
推荐引用方式 GB/T 7714	Zhao C. X.,Wang H. T.,Bai B. L.,et al. Organogels from unsymmetrical pi-conjugated 1,3,4-oxadiazole derivatives[J]. New Journal of Chemistry,2013,37(5).
APA	Zhao C. X..,Wang H. T..,Bai B. L..,Qu S. N..,Song J. X..,...&Li M..(2013).Organogels from unsymmetrical pi-conjugated 1,3,4-oxadiazole derivatives.New Journal of Chemistry,37(5).
MLA	Zhao C. X.,et al."Organogels from unsymmetrical pi-conjugated 1,3,4-oxadiazole derivatives".New Journal of Chemistry 37.5(2013).

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