Td. Selby et al., Triamino-s-triazine triradical trications. An experimental study of triazine as a magnetic coupling unit, ORG LETT, 2(2), 2000, pp. 171-174
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.