Cholesteryl derivatives as phase-selective gelators at room temperature
Cholesteryl derivatives as phase-selective gelators at room temperature
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室温下作为相选择胶凝剂的胆固醇衍生物
DOI：
10.1016/j.tet.2009.02.056
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发表时间：
2009-04-25
期刊：
影响因子：
2.1
通讯作者：
Fang, Yu
中科院分区：
文献类型：
--
作者：
Xue, Min;Gao, Di;Fang, Yu
制备了一种胆固醇基ALS和两种二聚胆固醇基A（LS）（2）低分子量有机胶凝剂（LMOG），分别含有邻苯二甲酰、间苯二甲酰和对苯二甲酰部分。甘精试验表明，2和3是比1更有效的胶凝剂。有趣的是，2和3可以在室温下自发地凝胶几种溶剂，这些凝胶具有触变性质，如流变学研究所揭示的。更有趣的是，2和3显示了溶剂从它们与水的混合物中的选择性凝胶化。通过SEM研究了凝胶的网络结构，并通过XRD分析研究了凝胶中LMOG的分子堆积方式。温度和浓度依赖性的H-1 NMR测量表明，凝胶因子分子之间的氢键是凝胶形成的重要驱动力。(C)2009爱思唯尔有限公司版权所有。
One cholesterol-based ALS and two dimeric cholesterol-based A(LS)(2) low-molecular-mass organic gelators (LMOGs) containing phthaloyl, isophthaloyl, and terephthaloyl moieties, respectively, were prepared. Gelation test revealed that 2 and 3 are more efficient gelators than 1. Interestingly, 2 and 3 can gel several solvents spontaneously at room temperature and these gels posses thixotropic properties as revealed by theological studies. More interestingly, 2 and 3 show selective gelation of the solvents from their mixtures with water. The network structures of some gels were investigated by SEM measurements, and the molecular packing mode of the LMOGs in the gel was studied by XRD analysis. Temperature-and concentration-dependent H-1 NMR measurements revealed that hydrogen bonding between the gelator molecules is an important driving force for the gel formation. (C) 2009 Elsevier Ltd. All rights reserved.