b,b-Carotene-4,4'-dione Singlet oxygen

Conn, P.F.; Schalch, W.; Truscott, T.G.
J. Photochem. Photobiol., B 11, 41-47 (1991)

Reaction: b,b-Carotene-4,4'-dione + ¹O₂^* ® products and/or physical quenching
Solvent: C₆H₅CH₃

k = 1.3 × 10¹⁰(L mol^-1 s^-1)

Experimental method: Flash photolysis
Analytical method: infrared luminescence
Data type: Absolute value measured directly
Excitation wavelength: 346 or 355 nm

Photosensitizer = Phenazine.

Jung, M.Y.; Min, D.B.
J. Am. Oil Chem. Soc. 68, 653-658 (1991)

Reaction: b,b-Carotene-4,4'-dione + ¹O₂^* ® products and/or physical quenching
Solvent: CH₂Cl₂

k = 1.1 × 10¹⁰(L mol^-1 s^-1)

Experimental method: Photolysis
Analytical method: chemical analysis
Data type: Derived from steady state measurements using indicator

Photosensitizer = Chlorophyll a; Indicator = Soybean oil; k for indicator = 1.0 × 10⁵ L/(mol·s); obs. peroxide formation. Added solute 0-10^-5. [Indicator] = 1.6 × 10^-1 (mol L^-1).

Di Mascio, P.; Kaiser, S.; Sies, H.
Arch. Biochem. Biophys. 274, 532-538 (1989)

Reaction: b,b-Carotene-4,4'-dione + ¹O₂^* ® products and/or physical quenching
Solvent: CHCl₃, 50%, EtOH, 50%

k = 6 × 10⁹(L mol^-1 s^-1), T = 310K

Experimental method: Chemical reaction
Analytical method: infrared luminescence
Data type: Derived from steady state measurements

¹O₂* from NDPO₂; reported k = 2.1 × 10¹⁰ L mol^-1 s^-1 using k_d = 1 × 10⁵ s^-1, recalcd. using k_d = 3.0 × 10⁴ s^-1 [92DIM/SUN].

Murasecco-Suardi, P.; Oliveros, E.; Braun, A.M.; Hansen, H.-J.
Helv. Chim. Acta 71, 1005-1010 (1988)

Reaction: b,b-Carotene-4,4'-dione + ¹O₂^* ® products and/or physical quenching
Solvent: CCl₄

k = 1.0 × 10¹⁰(L mol^-1 s^-1)

Experimental method: Photolysis
Analytical method: infrared luminescence
Data type: Derived from steady state measurements
Excitation wavelength: 366 nm

Photosensitizer = Phenalen-1-one. used solvent k_d = 35 s^-1. [O₂] = 2.6 × 10³.

Murasecco-Suardi, P.; Oliveros, E.; Braun, A.M.; Hansen, H.-J.
Helv. Chim. Acta 71, 1005-1010 (1988)

Reaction: b,b-Carotene-4,4'-dione + ¹O₂^* ® products and/or physical quenching
Solvent: CD₃OD

k = 1.2 × 10¹⁰(L mol^-1 s^-1)

Experimental method: Photolysis
Analytical method: infrared luminescence
Data type: Derived from steady state measurements
Excitation wavelength: 366 nm

Photosensitizer = Phenalen-1-one. used solvent k_d = 4.4 × 10³ s^-1. [O₂] = 2.1 × 10^-3.

Rodgers, M.A.J.; Bates, A.L.
Photochem. Photobiol. 31, 533-537 (1980)

Reaction: b,b-Carotene-4,4'-dione + ¹O₂^* ® products and/or physical quenching
Solvent: Benzene

k = 1.8 × 10¹⁰(L mol^-1 s^-1)

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

Photosensitizer = Anthracene.

Wilkinson, F.; Ho, W.-T.
Spectrosc. Lett. 11, 455-463 (1978)

Reaction: b,b-Carotene-4,4'-dione + ¹O₂^* ® products and/or physical quenching
Solvent: C₆H₆

k = 1.5 × 10¹⁰(L mol^-1 s^-1)

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

Photosensitizer = Anthracene.