Stealth Amphiphiles: Self-Assembly of Polyhedral Boron Clusters
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- 作者：Vladimír Ďorďovič ; Zdeněk Tošner ; Mariusz Uchman ; Alexander Zhigunov ; Mehedi Reza ; Janne Ruokolainen ; Goutam Pramanik ; Petr Cígler ; Květa Kalíková ; Michael Gradzielski ; Pavel Matějíček
- 刊名：Langmuir
- 出版年：2016
- 出版时间：July 5, 2016
- 年：2016
- 卷：32
- 期：26
- 页码：6713-6722
- 全文大小：802K
- 年卷期：0
- ISSN：1520-5827
文摘
This is the first experimental evidence that both self-assembly and surface activity are common features of all water-soluble boron cluster compounds. The solution behavior of anionic polyhedral boranes (sodium decaborate, sodium dodecaborate, and sodium mercaptododecaborate), carboranes (potassium 1-carba-dodecaborate), and metallacarboranes {sodium [cobalt bis(1,2-dicarbollide)]} was extensively studied, and it is evident that all the anionic boron clusters form multimolecular aggregates in water. However, the mechanism of aggregation is dependent on size and polarity. The series of studied clusters spans from a small hydrophilic decaborate-resembling hydrotrope to a bulky hydrophobic cobalt bis(dicarbollide) behaving like a classical surfactant. Despite their pristine structure resembling Platonic solids, the nature of anionic boron cluster compounds is inherently amphiphilic—they are stealth amphiphiles.