1,2,2,6,6-Pentamethyl-4-piperidinol Singlet oxygen

Cen, J.; Hu, X.; Shen, D.; Zhu, L.
Ganguang Kexue Yu Kuang Huaxue, 1-8 (1988)

Reaction: 1,2,2,6,6-Pentamethyl-4-piperidinol + ¹O₂^* ® products and/or physical quenching
Solvent: CHCl₃

k = 3.3 × 10⁷(L mol^-1 s^-1)

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

Photosensitizer = Indicator = Rubrene; used solvent k_d = 1.7 × 10⁴ s^-1; k for indicator = 5.3 × 10⁷ L/(mol·s).

Ballardini, R.; Beggiato, G.; Bortolus, P.; Faucitano, A.; Buttafava, A.; Gratani, F.
Polym. Degrad. Stab. 7, 41-53 (1984)

Reaction: 1,2,2,6,6-Pentamethyl-4-piperidinol + ¹O₂^* ® products and/or physical quenching
Solvent: Benzene, 80%, Methanol, 20%

k = 6.0 × 10⁷(L mol^-1 s^-1)

Experimental method: Flash photolysis
Analytical method: vis-UV absorption
Data type: Absolute value measured directly using indicator
Excitation wavelength: 694 nm

Photosensitizer = Methylene Blue; Indicator = 1,3-Diphenylisobenzofuran.

Monroe, B.M.
J. Phys. Chem. 81, 1861-1864 (1977)

Reaction: 1,2,2,6,6-Pentamethyl-4-piperidinol + ¹O₂^* ® products and/or physical quenching
Solvent: CHCl₃

k = 9.2 × 10⁷(L mol^-1 s^-1)

Experimental method: Photolysis
Analytical method: vis-UV absorption
Data type: Derived from steady state measurements using indicator

Photosensitizer = Indicator = Rubrene; used solvent k_d = 1.7 × 10⁴ s^-1; k for indicator = 5.3 × 10⁷ L/(mol·s).

Ivanov, V.B.; Shlyapintokh, V.Ya.; Khvostach, O.M.; Shapiro, A.B.; Rozantsev, E.G.
J. Photochem. 4, 313-319 (1975)

Reaction: 1,2,2,6,6-Pentamethyl-4-piperidinol + ¹O₂^* ® products
Reference Reaction: Tetracene + ¹O₂^* ®
Solvent: C₆H₆, 89%, EtOH, 11%

k_react = 2.3 × 10³(L mol^-1 s^-1), k_reference = 7 × 10⁷(L mol^-1 s^-1), T = 295K

Experimental method: Photolysis
Analytical method: electron spin resonance
Data type: Relative value measured by steady state method

Photosensitizer = Rose Bengal dianion; product = nitroxide radical.

Bystritskaya, E.V.; Karpukhin, O.N.
Dokl. Phys. Chem. 221, 353-356 (1975)

Reaction: 1,2,2,6,6-Pentamethyl-4-piperidinol + ¹O₂^* ® products and/or physical quenching
Reference Reaction: Tetracene + ¹O₂^* ®
Solvent: CH₂Cl₂

k = 5.2 × 10⁷(L mol^-1 s^-1)

Experimental method: Photolysis
Analytical method: vis-UV absorption
Data type: Derived from steady state measurements using indicator

Photosensitizer = Indicator = Tetracene. used solvent k_d = 7.3 × 10³ s^-1.