Organic Tri‐ and Tetraradicals with High‐Spin or Low‐Spin States

The toolbox for spin coupling is now well equipped, since nearly all possible topologies of organic tri- and tetraradicals are known, which can be applied as building blocks for the synthesis of practically useful polyradical materials. High-spin polyradicals could be useful as organic ferromagnets, whereas several low-spin polyradicals are suggested to support electric conductivity. An example of the latter is the derivative of the singlet tetraradical 1, in which both ferromagnetic and anti-ferromagnetic coupling operate.