Triamino-s-triazine triradical trications. An experimental study of triazine as a magnetic coupling unit

Triamino-s-triazine derivatives 3a, 4, and 5 have been prepared, and their cationic states have been analyzed electrochemically. At 298 K, 3a(+) has a limited lifetime in CH2CI2 solution, However, 4(+) and 5(+) are long lived under such conditions, and quartet states of 4(3+) and 5(3+) are observed by ESR spectroscopy, Variable temperature ESR analysis and NMR shift suscep tibility measurements indicate that 5(3+) is a doublet ground state with a populated quartet state.