A Theta-Shaped Amphiphilic Cobaltabisdicarbollide Anion: Transition From Monolayer Vesicles to Micelles (Angew. Chem. Int. Ed. 23/2011)

Dr. Pierre Bauduin, Dr. Sylvain Prevost, Dr. Pau Farràs, Prof. Francesc Teixidor, Dr. Olivier Diat, Prof. Thomas Zemb. First published: 3 May 2011. Angewandte Chemie International Edition Volume 50, Issue 23, pages 5298–5300, May 27, 2011. DOI: 10.1002/anie.201102614

The cobaltabisdicarbollide (mono-)anion ([3,3′-Co(1,2-C2B9H11)2]−, COSAN−) forms monolayer vesicles at low concentrations in water (see picture). An increase in concentration leads to a Coulomb explosion of the closely packed vesicles into small micelles, which results in the coexistence of both aggregation states at higher concentrations.

 

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