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Structure- and solvent-triggered influences in the self-assembly of polyoxometalate–steroid conjugates

机译:在多氧化酯 - 类固醇缀合物的自组装中的结构和溶剂触发的影响

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We report that supramolecular structures formed by polyoxometalate–steroid conjugates in a self-assembly process can be greatly influenced by molecular structures and solution components. Specifically, we deliberately selected three steroids ( e.g. cholic acid, dehydrocholic acid, cholesterol) and an organically modified Anderson-type POM cluster to construct conjugates with the molecular structure of steroid–POM–steroid, then carried out careful research on their supramolecular self-assembly in toluene–DMF, CH _(2) Cl _(2) –CH _(3) OH and acetone, respectively. Upon investigation of the TEM and AFM characterizations, we found that the three POM–steroid conjugates displayed unexpectedly different supramolecular structures in the self-assembly process, and only the POM–Chol conjugate could fabricate well-defined fibrous structures in different solutions. Based on the TEM, AFM, FT-IR and XRD characterizations and discussion, a mechanism of the hierarchical self-assembly process of the POM–cholesterol conjugate was also proposed. Moreover, we explained on a molecular level why the morphologies of the POM–Chol conjugate in different solvents were better than those of the POM–Ca conjugate and POM–Dhca conjugate.
机译:我们报告了通过分子结构和溶液组分的多组装过程中的多氧化素 - 类固醇缀合物形成的超分子结构。具体地,我们刻意选择三种类固醇(例如胆酸,脱羟基酸,胆固醇)和有机改性的和龙酮型POM簇,以将缀合物与类固醇 - Pom-ortoid的分子结构构成,然后对其超分子自我进行仔细研究组装在甲苯-DMF,CH_(2)CL _(2)-CH _(3)oh和丙酮中。在调查TEM和AFM表征时,我们发现三个POM类固醇缀合物在自组装过程中出现意外不同的超分子结构,并且只有POM-CHOL缀合物可以在不同的溶液中制造明确定义的纤维结构。基于TEM,AFM,FT-IR和XRD表征和讨论,还提出了Pom-Cholesterol缀合物的分层自组装过程的机制。此外,我们解释了不同溶剂中POM-CHOL缀合物的形态的分子水平优于POM-CA缀合物和POM-DHCA缀合物的形态。

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    《RSC Advances》 |2016年第71期|共7页
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    Hai-Kuan Yang;

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