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首页> 外文期刊>RSC Advances >Multicompartment-like aggregates formed by a redox-responsive surfactant encapsulated polyoxometalate in DMF/butanol mixed solvent
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Multicompartment-like aggregates formed by a redox-responsive surfactant encapsulated polyoxometalate in DMF/butanol mixed solvent

机译：在DMF /丁醇混合溶剂中由氧化还原响应性表面活性剂封装的多金属氧酸盐形成的多室状聚集体

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摘要

The unique and interesting aggregation behaviors of a novel surfactant-encapsulated complex (SEC), composed of a Keggin-type polyoxometalate (POM), phosphotungstic acid and a redox-responsive ferrocene-containing cationic surfactant, dimethyldioctadecylammonium bromide (BFDMA), have been investigated in N,N-dimethylformamide (DMF)/butanol mixed solvent. By carefully tuning the composition of the solvent, hollow spherical aggregates with multilayered shells were initially observed with a diameter of 55 ± 9 nm using transmission or scanning electron microscopes. Owing to the solvophobic effect and π–π stacking interaction between alkyl chains or ferrocene groups, these spherical aggregates were found to gradually fuse together into aggregates with flower-like and finally compartment-like morphologies with an average size of 120–150 nm. Based on X-ray diffraction measurements and the molecular configuration data of SEC, the multilayers in aggregates were composed of bilayers of SEC with the POM inside and three rearranged BFDMA molecules outside. The morphology of such aggregates was partially reversible under electrochemical modulation. Applying an anodic oxidation potential would induce the disassembling of compartment-like aggregates into irregular spheres with a size of about 200 nm, which could be turned back after applying a cathodic reduction potential. The obtained results here should shed light on the design of novel nanostructures from such inorganic/organic hybrid clusters.
机译：研究了由Keggin型多金属氧酸盐（POM），磷钨酸和含氧化还原响应的二茂铁阳离子表面活性剂，二甲基二十八烷基溴化铵（BFDMA）组成的新型表面活性剂复合物（SEC）的独特且有趣的聚集行为。在 N ， N -二甲基甲酰胺（DMF）/丁醇混合溶剂中。通过仔细调节溶剂的组成，首先使用透射或扫描电子显微镜观察到具有多层壳的空心球形聚集体，其直径为55±9 nm。由于疏溶剂效应和烷基链或二茂铁基团之间的π-π堆积相互作用，这些球形聚集体逐渐融合在一起，形成了具有花状和最后间隔状形态的聚集体，平均大小为120-150 nm。根据X射线衍射测量和SEC的分子构型数据，聚集体中的多层由SEC双层组成，POM位于内部，而三个重排的BFDMA分子位于外部。这种聚集体的形态在电化学调制下是部分可逆的。施加阳极氧化电势会导致隔室状聚集体分解成大小约为200 nm的不规则球体，在施加阴极还原电势后可能会折回。在这里获得的结果应该为这种无机/有机杂化团簇的新型纳米结构的设计提供启发。

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