1-Amino-4-hydroxyanthraquinone

Land, E.J.; McAlpine, E.; Sinclair, R.S.; Truscott, T.G.
Triplet excited states of 1,4-disubstituted anthraquinones: Possible evidence for association of quinones in solution.
J. Chem. Soc., Faraday Trans. 1 72: 2091-100 (1976)

1-Amino-4-hydroxyanthraquinone
Solvent : Benzene

wave length (nm) at maximum, extinction coefficient = 500, 28000

Triplet state population method: Pulse radiolysis (coupled with energy transfer)
Extinction coefficient estimation method: Energy transfer
Lifetime = 6.7 micro sec.
ET = 123 - 176 kJ mol–1.
Triplet energy transfer rate constant = 3.0 x 109 L mol–1 sec–1.
Comments: *Triplet ET from biphenyl; epsilon relative to biphenyl in benzene assuming ground state dimerization

* Evidence supporting the assignment of the transient triplet state.
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