2-Amino-4-pteridinone

Chahidi, C.; Aubailly, M.; Monzikoff, A.; Bazin, M.; Santus, R.
Photophysical and photosensitizing properties of 2-amino-4 pteridinone: A natural pigment.
Photochem. Photobiol. 33: 641-9 (1981)

2-Amino-4-pteridinone
Solvent : Water, pH = 9.2

wave length at maximum = 600; 415 nm

Triplet state population method: Pulsed laser photolysis
Lifetime = 0.3 micro sec.
Comments: 100 ns delay

Chahidi, C.; Aubailly, M.; Monzikoff, A.; Bazin, M.; Santus, R.
Photophysical and photosensitizing properties of 2-amino-4 pteridinone: A natural pigment.
Photochem. Photobiol. 33: 641-9 (1981)

2-Amino-4-pteridinone
Solvent : Water, pH = 12

wave length at maximum = 460 nm

Triplet state population method: Pulsed laser photolysis
Lifetime = 0.5 micro sec.
Comments: 400 ns delay, pKa = 9.5-10

Chahidi, C.; Aubailly, M.; Monzikoff, A.; Bazin, M.; Santus, R.
Photophysical and photosensitizing properties of 2-amino-4 pteridinone: A natural pigment.
Photochem. Photobiol. 33: 641-9 (1981)

2-Amino-4-pteridinone
Solvent : Water, pH = 9.2

wave length (nm) at maximum, extinction coefficient = 550, 2000
360a, 4700a

Triplet state population method: Pulsed laser photolysis
Extinction coefficient estimation method: Hydrogen atom transfer
Lifetime = 2.3 ± 0.2 micro sec.
Comments: *Oxygen quenching (1.3 x 109 L mol–1 s–1); hydrogen abstraction from guanosine; epsilon550 relative to semireduced radical in water (epsilon480 = 2300 L mol–1 cm–1); epsilon385 and epsilon325 are at isobestic points in difference spectrum; 400 ns delay

* 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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