Alloxazine

Dekker, R.H.; Srinivasan, B.N.; Huber, J.R.; Weiss, K.
Photochemistry of flavins. I. Conventional and laser flash photolysis study of alloxazine.
Photochem. Photobiol. 18: 457-66 (1973)

Alloxazine
Solvent : EtOH

wave length at maximum = 438a nm wave length (nm) at maximum, extinction coefficient = 500, 13000

Triplet state population method: Pulsed laser photolysis
Extinction coefficient estimation method: Singlet depletion
Lifetime = 13 micro sec.
Comments: *Phosphorescence decay at 77 K; 438 nm peak may be distorted by SD

Dekker, R.H.; Srinivasan, B.N.; Huber, J.R.; Weiss, K.
Photochemistry of flavins. I. Conventional and laser flash photolysis study of alloxazine.
Photochem. Photobiol. 18: 457-66 (1973)

Alloxazine
Solvent : Water, pH = 6

wave length at maximum = 560; 420 nm

Triplet state population method: Pulsed laser photolysis
Lifetime = 9 micro sec.
Comments: *Oxygen quenching

Dekker, R.H.; Srinivasan, B.N.; Huber, J.R.; Weiss, K.
Photochemistry of flavins. I. Conventional and laser flash photolysis study of alloxazine.
Photochem. Photobiol. 18: 457-66 (1973)

Alloxazine
Solvent : Water, pH = 2

wave length at maximum = 550; 420 nm

Triplet state population method: Pulsed laser photolysis
Lifetime = 9 micro sec.
Comments: *Oxygen quenching

Grodowski, M.S.; Veyret, B.; Weiss, K.
Photochemistry of flavins. II. Photophysical properties of alloxazines and isoalloxazines.
Photochem. Photobiol. 26: 341-52 (1977)

Alloxazine
Solvent : Water, pH = 2.2

wave length (nm) at maximum, extinction coefficient = 550, 7000
400a, 12600a
275a, 28000a

Triplet state population method: Pulsed laser photolysis
Extinction coefficient estimation method: Relative actinometry
Lifetime = 9.1 micro sec.
Triplet energy transfer rate constant = (1.7 ± 0.2) x 109 L mol–1 sec–1.
Comments: *Oxygen quenching; energy transfer to oxygen; lifetime measured at 560 nm; epsilon relative to anthracene in cyclohexane (PhiT = 0.71, epsilon423 = 64700 L mol–1 cm–1) and using PhiT = 0.31 for alloxazine in water; shoulder around 360 nm

* Evidence supporting the assignment of the transient triplet state.
a Data have been obtained by computer-assisted digitization from spectrum in cited reference.
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