Two novel cholesteryl derivatives of calix[4]arene with L- or D-phenylalanine residues in the linkers (1 and 2, respectively) were designed and synthesized. The gelation behaviors of the compounds in 30 organic solvents were tested. It was demonstrated that 1 gels n-butanol and n-pentanol at room temperature, but 2 gels isopropanol only under the treatment of heating–cooling cycling or energy supplementing via sonication, vortex or agitation at room temperature. AFM and SEM measurements revealed that the structures of the gel networks are greatly affected by the spatial configurations of the linkers contained in the calix[4]arene derivatives. Furthermore, mechanical treatment not only promotes the gelation of the system of 2–isopropanol, but also enhances the strength of the gel. Specifically, 18 min of agitation at room temperature makes the storage modulus and the yield stress of the gel (3.5%, w/v) exceed 1 × 106 Pa and 6 × 103 Pa, respectively, which are second only to the mechanically strongest low molecular mass gelator-based molecular gel reported until now. XRD analysis revealed the hexagonal packing structure of 1 in its n-pentanol gel.
设计并合成了两种新型的杯[4]
芳烃胆固醇衍
生物,其连接子中带有L-或
D-苯丙氨酸残基(分别为1和2)。测试了化合物在30种有机溶剂中的凝胶行为。结果表明,1在室温下使
正丁醇和正
戊醇凝胶,但2仅在室温下通过加热-冷却循环或通过超声处理、涡旋或搅拌补充能量的处理下使
异丙醇凝胶。 A
FM 和
SEM 测量表明,凝胶网络的结构很大程度上受到杯[4]
芳烃衍
生物中所含连接体的空间构型的影响。此外,机械处理不仅促进2-
异丙醇体系的凝胶化,而且增强了凝胶的强度。具体来说,室温搅拌18 min,使凝胶的储能模量和屈服应力(3.5%,w/v)分别超过1×106 Pa和6×103 Pa,仅次于机械最强的低温迄今为止报道的基于分子质量凝胶剂的分子凝胶。 XRD分析揭示了1在正
戊醇凝胶中的六方堆积结构。