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首页> 外文期刊>Chemistry: A European journal >Supramolecular polymer hydrogels from bolaamphiphilic L -histidine and benzene dicarboxylic acids: Thixotropy and significant enhancement of Eu~III fluorescence
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Supramolecular polymer hydrogels from bolaamphiphilic L -histidine and benzene dicarboxylic acids: Thixotropy and significant enhancement of Eu~III fluorescence

机译：聚两亲性L-组氨酸和苯二甲酸的超分子聚合物水凝胶：触变性和Eu〜III荧光的显着增强

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摘要

Supramolecular polymers from the bolaamphiphilic L-histidine (BolaHis) and benzene dicarboxylic acids (o-phthalic acid, OPA; isophthalic acid, IPA and terephthalic acid, TPA) were found to form hydrogels although neither of the single components could gel water. It was suggested that the hydrogen bond and ionic interactions among different imidazole and carboxylic acid groups are responsible for the formation of the supramolecular polymer as well as the hydrogel formation. Depending on the structures of the dicarboxylic acids, different behaviors of the gels were observed. The hydrogels from OPA/BolaHis and IPA/BolaHis showed thixotropic properties, that is, the hydrogel was destroyed by hand shaking and then slowly gelated again at room temperature. However, the hydrogels of TPA/BolaHis could not. Interestingly, when Eu~ III was doped into IPA/BolaHis supramolecular polymers, very strong luminescence enhancement was observed. FT-IR spectroscopies and XRD analysis revealed that the strong luminescence enhancement could be attributed to the matched supramolecular nanostructures, which render the correct binding and a good dispersion of Eu~ III ions. The work offers a new approach for fabricating functional hydrogels through the supramolecular polymers. Gelling together: The combination of the supramolecular polymers bolaamphiphilic L-histidine and benzene dicarboxylic acid was found to form hydrogels (see scheme), even though the components are unable to form gels independently. Depending on the structures of the dicarboxylic acids, the hydrogels show thixotropic properties or strongly enhanced luminescence upon doping with Eu~ III.
机译：发现由保兰两性的L-组氨酸（BolaHis）和苯二甲酸（邻苯二甲酸，OPA;间苯二甲酸，IPA和对苯二甲酸，TPA）形成的超分子聚合物形成了水凝胶，尽管单个成分都不能使水凝胶化。建议不同咪唑和羧酸基团之间的氢键和离子相互作用是超分子聚合物的形成以及水凝胶的形成的原因。根据二羧酸的结构，观察到凝胶的不同行为。来自OPA / BolaHis和IPA / BolaHis的水凝胶显示出触变性，即，通过摇晃破坏水凝胶，然后在室温下再次使其缓慢凝胶化。但是，TPA / BolaHis的水凝胶不能。有趣的是，当Eu〜III掺入IPA / BolaHis超分子聚合物中时，观察到非常强的发光增强作用。 FT-IR光谱和XRD分析表明，强的发光增强可归因于匹配的超分子纳米结构，其提供了正确的结合和Eu〜III离子的良好分散。这项工作为通过超分子聚合物制备功能性水凝胶提供了一种新方法。胶凝：发现超分子聚合物聚两亲性L-组氨酸和苯二甲酸的组合形成水凝胶（参见方案），即使各成分不能独立形成凝胶。取决于二羧酸的结构，水凝胶在掺杂Eu〜III后显示出触变性或强烈增强的发光。

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