Quenching of the triplet state 3Au of biacetyl by halogenated compounds |
| |
| Affiliation: | 1. Chemistry Department, Faculty of Science, Fayoum University, Fayoum, Egypt;2. Chemistry Department, College of Science and Arts in Qurayate, Jouf University, Saudi Arabia;3. Department of Chemistry, Faculty of Science, New Valley University, El-Kharja 72511, Egypt;1. Department of Chemistry, Key Laboratory of Functional Molecular Engineering of Guangdong Province, South China University of Technology, Guangzhou 510641, China;2. State Key Laboratory of Optoelectronics Materials and Technologies, Sun Yat-Sen University, Guangzhou 510275, China;3. Department of Anesthesiology, Guangdong Provincial People’s Hospital, Guangzhou 510080, China |
| |
| Abstract: | The lifetime of excited triplet 3Au biacetyl molecules was determined in the presence of various halogenated methanes and hydrogen halides. Stern-Volmer analysis of the data gave the following quenching rate constants in the gas phase at 25 °C (in units of litres per mole per second): CF4, less than 5 × 102; CF3Cl, 1.9 × 105; CF3Br, 5.0 × 105; CF3I, 9.3 × 106; CCl3Br, 8.2 × 105; CH4, less than 5 × 102; CH3Cl, 1.0 × 104; CH3Br, 3.7 × 104; CH3I, 4.2 × 105; HCl, 5.1 × 105; HBr, 2.7 × 107. The quenching rate constants observed for the halogenated methanes are consistent with a halogen atom abstraction process. The data for the hydrogen halides are interpreted in terms of a mechanism involving hydrogen atom abstraction with the formation of the biacetyl ketyl radical. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
