Title :

Simultaneous Determination of the Chemical ( <i> k _r </i> ) and the Physical ( <i> k _q </i> ) Quenching Rate Constants of Singlet Oxygen in Aqueous Solution by the Chemiluminescence‐quenching Method

Author(s) :

Pierlot, Christel [Auteur]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Nardello-Rataj, Véronique [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Aubry, Jean-Marie [Auteur]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181

Journal title :

Photochemistry and Photobiology

Abbreviated title :

Photochem & Photobiology

Volume number :

97

Pages :

1343-1352

Publication date :

2021-11

ISSN :

0031-8655, 1751-1097

HAL domain(s) :

Chimie/Chimie organique

English abstract : [en]

This work reports a novel and visual method for the simultaneous determination of the chemical (kr) and the physical (kq) quenching rate constants of singlet oxygen (1O2,1∆g) in aqueous media. It is based on the disruption, ...
Show more >This work reports a novel and visual method for the simultaneous determination of the chemical (kr) and the physical (kq) quenching rate constants of singlet oxygen (1O2,1∆g) in aqueous media. It is based on the disruption, by a water-soluble substrate S, of the 1O2 chemiluminescence (CL) generated by the H2O2/Na2MoO4 catalytic system. A mathematical analysis of the CL signal at 1270 nm vs time provides separately the overall (kr + kq) and the chemical (kr) quenching rate constants. In ordinary water (H2O), 1O2 lifetime is short and the CL intensity is weak allowing solely the investigation of very reactive substrates for which (kr + kq) > 3 × 106 m−1 s−1 while, in D2O, 1O2 lifetime is significantly longer lifetime and the CL signal is much stronger allowing the study of poorly reactive substrates for which (kr + kq) > 4 × 105 m−1 s−1. The method has been successfully tested on a series of anionic and nonionic water-soluble naphthalene derivatives commonly used as bio-compatible 1O2 carriers. The obtained kr and kq values are in good agreement with the values determined by conventional techniques, namely, flash photolysis and competitive kinetics with a reference quencher.Show less >

Language :

Anglais

Audience :

Non spécifiée

Popular science :

Non

Administrative institution(s) :

CNRS
Centrale Lille
ENSCL
Univ. Artois
Université de Lille

Collections :

• Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181

Research team(s) :

Colloïdes catalyse oxydation (CÏSCO)

Submission date :

2022-03-24T09:02:55Z
2023-11-28T13:43:09Z