Crocetin Singlet oxygen

Manitto, P.; Speranza, G.; Monti, D.; Gramatica, P.
Tetrahedron Lett. 28, 4221-4224 (1987)

Reaction: Crocetin + ¹O₂^* ® physical quenching
Solvent: HCON(CH₃)₂

k_quen ~ 7 × 10⁹(mol L^-1), T = 308K

Experimental method: Chemical reaction
Analytical method: vis-UV absorption
Data type: Derived from steady state measurements

used solvent k_d = 1.4 × 10⁵ s^-1; k_prod. < 5 × 10⁶ L mol^-1 s^-1; ¹O₂* from MNPO₂.

Manitto, P.; Speranza, G.; Monti, D.; Gramatica, P.
Tetrahedron Lett. 28, 4221-4224 (1987)

Reaction: Crocetin + ¹O₂^* ® physical quenching
Solvent: DMSO

k_quen ~ 2 × 10⁹(mol L^-1), T = 308K

Experimental method: Chemical reaction
Analytical method: vis-UV absorption
Data type: Derived from steady state measurements

used solvent k_d = 4.2 × 10⁴ s^-1; k_prod. < 5 × 10⁶ L mol^-1 s^-1; ¹O₂* from MNPO₂.

Manitto, P.; Speranza, G.; Monti, D.; Gramatica, P.
Tetrahedron Lett. 28, 4221-4224 (1987)

Reaction: Crocetin + ¹O₂^* ® physical quenching
Solvent: H₂O

k_quen = 5.5 × 10⁹(mol L^-1), pH = 7.8, T = 308K

Experimental method: Chemical reaction
Analytical method: vis-UV absorption
Data type: Derived from steady state measurements

used solvent k_d = 4.2 × 10⁴ s^-1; k_prod. = 2.5 × 10⁸ L mol^-1 s^-1; ¹O₂* from MNPO₂.

Matheson, I.B.C.; Rodgers, M.A.J.
Photochem. Photobiol. 36, 1-4 (1982)

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

k_react = 6 × 10⁸(L mol^-1 s^-1), pH = 8.4, T = 293K

Experimental method: Flash photolysis
Analytical method: vis-UV absorption
Data type: Absolute value measured directly using indicator
Excitation wavelength: 337 nm

Photosensitizer = Pyrenebutyrate ion; Indicator = 1,3-Diphenylisobenzofuran; k for indicator = 1.0 × 10⁹ L/(mol·s). Added solute ~1 × 10^-4. [Sensitizer] = 1.4 × 10^-4 (mol L^-1).

Matheson, I.B.C.; Rodgers, M.A.J.
Photochem. Photobiol. 36, 1-4 (1982)

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

k = 2.5 × 10⁹(L mol^-1 s^-1), pH = 8.4, T = 293K

Experimental method: Flash photolysis
Analytical method: vis-UV absorption
Data type: Absolute value measured directly
Excitation wavelength: 337 nm

Photosensitizer = Pyrenebutyrate ion. Added solute ~1 × 10^-4. [Sensitizer] = 1.4 × 10^-4 (mol L^-1).