The highly stable dimeric radical cation of a C3-symmetric triazacyclophane (see picture), with the positive charge delocalized over the two molecules, offers an excellent model for the study of intermolecular communication depending on hole hopping.
![Redox-active C3-symmetric triindole based triazacyclophane](https://www.iciq.org/wp-content/uploads/2014/03/Redox-active-C3-symmetric_eng_noticies_articles_2006_46.gif)