'Triplet-Triplet Absorption Spectra

Acridine Orange, conjugate monoacid

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, conjugate monoacid
Solvent : EtOH, pH Acidic

wave length (nm) at maximum, extinction coefficient = 490, 135000

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

Zanker, V.; Miethke, E.
Die spektroskopisch nachweisbaren Elektronenzustaende der stabilen und metastabilen Molekelform einiger Acridinfarbstoffe und des Fluoresceinkations.
Z. Naturforsch., Teil A 12A: 385-95 (1957)

Acridine Orange, conjugate monoacid
Solvent : EtOH/Et₂O, 90 K

wave length (nm) at maximum, extinction coefficient = 1270, 54000^a

1050^a, 16000^a

645, 10500^a

540, 10000^a

390, 4000^a

285, 57000^a

245, 18000^a

205, 16000^a

Triplet state population method: Photostationary
Extinction coefficient estimation method: Singlet depletion
Comments: Solvent was 2:1 EtOH to Et₂O

Morozov, Yu.V.; Savenko, A.K.
Probabilities of intramolecular radiative and radiationless transitions of some amino derivatives of acridine.
Mol. Photochem. 8: 1-43 (1977)

Acridine Orange, conjugate monoacid
Solvent : Glycerol, 293 K

wave length at maximum = 670^a; 620^a; 580^a nm

Triplet state population method: Flash photolysis
Comments: Solvent has added glucose

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, conjugate monoacid
Solvent : MeOH, pH Acidic

wave length (nm) at maximum, extinction coefficient = 610, 9400

560, 9200

Triplet state population method: Flash photolysis
Extinction coefficient estimation method: Total depletion
Lifetime = 105 micro sec.
Comments: pK_a(MeOH) = 11.2

Nouchi, G.
Etude et interpretation des spectres d'absorption triplet-triplet. Classification des etats triplets superieurs. I. Les matieres colorantes.
J. Chim. Phys. Phys.-Chim. Biol. 66: 548-53 (1969)

Acridine Orange, conjugate monoacid
Solvent : PMMA, 77 K, pH = 4.0

wave length at maximum = 1208^a; 654^a; 549^a nm

Triplet state population method: Photostationary
Comments: Relative intensities (10:3:3); shoulders at 1090^a and 1002^a nm; solvent contains 2-chloroethanol

Kellmann, A.
Primary photochemical processes of cationic acridine orange in aqueous solution studied by flash photolysis.
Photochem. Photobiol. 20: 103-8 (1974)

Acridine Orange, conjugate monoacid
Solvent : Water, pH = 3

wave length (nm) at maximum, extinction coefficient = 530, 9500

480, 14000

280, 35000

Triplet state population method: Flash photolysis
Extinction coefficient estimation method: Total depletion
Lifetime = ~3000 micro sec.

^a Data have been obtained by computer-assisted digitization from spectrum in cited reference.
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wave length (nm) at maximum, extinction coefficient =	1270, 54000^a
	1050^a, 16000^a
	645, 10500^a
	540, 10000^a
	390, 4000^a
	285, 57000^a
	245, 18000^a
	205, 16000^a

wave length (nm) at maximum, extinction coefficient =	610, 9400
	560, 9200

wave length (nm) at maximum, extinction coefficient =	530, 9500
	480, 14000
	280, 35000