New dicholesteryl-based gelators: gelling ability and selective gelation of organic solvents from their mixtures with water at room temperature
New dicholesteryl-based gelators: gelling ability and selective gelation of organic solvents from their mixtures with water at room temperature
复制标题
新型二胆甾醇基胶凝剂：室温下有机溶剂与水的混合物的胶凝能力和选择性胶凝
DOI：
10.1039/b807576j
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发表时间：
2008-01-01
影响因子：
3.3
通讯作者：
Fang, Yu
中科院分区：
文献类型：
--
作者：
Peng, Junxia;Liu, Kaiqiang;Fang, Yu
设计并制备了四种新型苯丙酸二胆酯二酸酰胺。含有3个、4个、5个或6个碳原子的间隔剂的化合物分别记为1-4。凝胶实验表明，这四种化合物都是多用途的有机凝胶剂，通过扫描电镜和x射线衍射（XRD）测试，发现间隔层长度的细微变化会使化合物的凝胶行为发生巨大变化，凝胶网络的微观结构也会发生变化。在研究的77种凝胶体系中，至少有7种，包括2/煤油、2/甲苯、2/二甲苯、3/煤油、3/1-戊醇、3/1-己醇和3/1-庚醇，在室温下自发凝胶。此外，2和3可用于二甲苯或煤油与水的混合物的选择性凝胶化。重要的是，加热和冷却循环或添加助溶剂对于选择性凝胶化是不必要的。此外，2/二甲苯的凝胶具有足够的机械强度来分离，因此可以认为2是实际分离二甲苯与水混合物的强有力的候选者。FT-IR和温度相关的H-1核磁共振测量表明，分子间氢键对凝胶网络的形成和维持起着重要作用。
Four new diacid amides of dicholesteryl L-phenylalaninate were designed and prepared. The compounds with spacers containing three, four, five, or six carbon atoms are denoted as 1-4, respectively. Gelation tests showed that the four compounds are versatile organogelators, and a subtle change in the length of the spacer can produce a dramatic change in the gelation behaviors of the compounds, as well as the micro-structures of the gel networks as revealed by SEM and XRD measurements. Within the 77 gel systems studied, at least seven of them, including 2/kerosene, 2/toluene, 2/xylene, 3/kerosene, 3/1-pentanol, 3/1-hexanol and 3/1-heptanol, gel spontaneously at room temperature. Furthermore, 2 and 3 can be used for the selective gelation of xylene or kerosene from their mixtures with water. Importantly, heating and cooling cycle or addition of a co-solvent is not necessary for the selective gelation. Furthermore, the gels of 2/xylene are mechanically strong enough for separation, and thereby it is believed that 2 is a strong candidate for the practical separation of xylene from its mixture with water. FT-IR and temperature-dependent H-1 NMR measurements demonstrated that inter-molecular hydrogen bonding plays an important role for the formation and maintenance of the gel networks.