Affiliation:
1. Wydział Chemii Uniwersytet Wrocławski ul. F. Joliot-Curie 14 50-383 Wrocław Poland
2. Department of Physical Chemistry Faculty of Sciences University of Málaga Campus de Teatinos 29071 Málaga Spain
3. Departamento de Química Inorgánica Universidad de Valencia Dr Moliner 50 46100 Burjasot Spain
Abstract
AbstractA triskelion‐shaped triradical triindeno[1,2‐a:1′,2′‐g : 1′′,2′′‐m]triphenylen‐7‐yl (1) and its internally fused derivative (2) obtained by oxidative cyclization were prepared in a straightforward synthetic sequence. Both compounds were confirmed to be triradicals and to possess intramolecular antiferromagnetic exchange interactions between spins, displaying a spin‐frustrated doublet ground state with doublet‐quartet energy gaps of −0.14 kcal/mol for 1 and −0.06 kcal/mol for 2. Despite their open‐shell character, they were sufficiently stable to be handled under ambient conditions on a timescale of days. Both compounds could be reversibly reduced to mono‐, di‐, and trianions and oxidized to 1+ and 22+, with strong NIR absorptions (1800 to over 3200 nm) observed for all open‐shell ions.