Cysteine, negative ion Singlet oxygen

Rougee, M.; Bensasson, R.V.; Land, E.J.; Pariente, R.
Photochem. Photobiol. 47, 485-489 (1988)

Reaction: CysS^- + ¹O₂^* ® products and/or physical quenching
Solvent: D₂O

k = 1.5 × 10⁸(L mol^-1 s^-1)

Experimental method: Flash photolysis
Analytical method: infrared luminescence
Data type: Derived from pH study

Photosensitizer = H₂TPPS^4- or H₂TMpyP⁴⁺; calcd. from k_obs = 8.9 × 10⁶ at pH 7 and pK_a = 8.6.