Triindenotriphenylenes: Spin-Frustrated Triskelion Triradicals with Excellent Ambient Stability.
Arseni BorissovPiotr J ChmielewskiAbel Cárdenas ValdiviaCarlos J Gómez GarcíaJuan CasadoMarcin StępieńPublished in: Angewandte Chemie (International ed. in English) (2024)
A 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 2 2+ , with strong NIR absorptions (1800 to over 3200 nm) observed for all open-shell ions.
Keyphrases
- air pollution
- particulate matter
- minimally invasive
- room temperature
- photodynamic therapy
- density functional theory
- single molecule
- quantum dots
- transition metal
- water soluble
- biofilm formation
- fluorescence imaging
- low density lipoprotein
- energy transfer
- escherichia coli
- fluorescent probe
- ionic liquid
- cystic fibrosis
- amino acid
- candida albicans
- pseudomonas aeruginosa