Acridine Orange, free base

Soep, B.; Kellmann, A.; Martin, M.; Lindqvist, L.
Study of triplet quantum yields using a tunable dye laser.
Chem. Phys. Lett. 13: 241-4 (1972)

Acridine Orange, free base
Solvent : EtOH, pH Basic

wave length (nm) at maximum, extinction coefficient = 410, 42000

Triplet state population method: Flash photolysis
Extinction coefficient estimation method: Total depletion

Vogelmann, E.; Rauscher, W.; Kramer, H.E.A.
Reactivity of acridine dye triplet states in electron transfer reactions.
Photochem. Photobiol. 29: 771-6 (1979)

Acridine Orange, free base
Solvent : MeOH, pH Basic

wave length (nm) at maximum, extinction coefficient = 550, 7800
410, 39900

Triplet state population method: Flash photolysis
Extinction coefficient estimation method: Total depletion
Lifetime = 285 micro sec.

Laffitte, E.; Nouchi, G.
Contribution a l'etude de l'etat metastable des molecules de colorants: Bandes d'absorption dans le domaine visible.
C.R. Seances Acad. Sci. 248: 2746-8 (1959)

Acridine Orange, free base
Solvent : PMMA, 193 K

wave length at maximum = 530 nm

Triplet state population method: Photostationary
Comments: Shoulders at 630 and 545 nm

Lochet, R.; Nouchi, G.
Contribution a l'etude de l'etat triplet des colorants: Spectres d'absorption dans le domaine des grandes longueurs d'onde, rouge et proche infrarouge.
C.R. Seances Acad. Sci. 260: 1897-1900 (1965)

Acridine Orange, free base
Solvent : PMMA, 77 K

wave length at maximum = 1210; 1100; 1020; 650 nm

Triplet state population method: Photostationary

Kellmann, A.
A flash photolysis study of the triplet state of acridine orange in basic solvents.
Photochem. Photobiol. 14: 85-93 (1971)

Acridine Orange, free base
Solvent : Water, pH = 12

wave length (nm) at maximum, extinction coefficient = 550, 7000
410, 37000
270, 40000

Triplet state population method: Flash photolysis
Extinction coefficient estimation method: Total depletion
Lifetime = 3.3 x 103 micro sec.
Comments: *Triplet ET to acridine; neutral form; an absorption was observable out to 900 nm

* Evidence supporting the assignment of the transient triplet state.
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