Stealth amphiphiles: self-assembly of polyhedral boron clusters

0461514 - ÚMCH 2017 RIV US eng J - Journal Article
Ďorďovič, V. - Tošner, Z. - Uchman, M. - Zhigunov, Alexander - Reza, M. - Ruokolainen, J. - Pramanik, Goutam - Cígler, Petr - Kalíková, K. - Gradzielski, M. - Matějíček, P.
Stealth amphiphiles: self-assembly of polyhedral boron clusters.
Langmuir. Roč. 32, č. 26 (2016), s. 6713-6722. ISSN 0743-7463
R&D Projects: GA ČR(CZ) GA14-14608S
Institutional support: RVO:61389013 ; RVO:61388963
Keywords : surfactant micelle formation * air-water-interface * light-scattering
Subject RIV: CD - Macromolecular Chemistry; CA - Inorganic Chemistry (UOCHB-X)
Impact factor: 3.833, year: 2016

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.
Permanent Link: http://hdl.handle.net/11104/0261162