Important role of reaction field in photodegradation of deca-bromodiphenyl ether: Theoretical and experimental investigations of solvent effects
(0) Photolysis of deca-bromodiphenyl ether (BDE-209) was investigated in tetrahydrofuran, dichlorometh-ane, isopropanol, acetone, ethanol, methanol, acetonitrile and dimethylsulfoxide. Noticeable differences of the photolytic rates and quantum yields were found in the diverse solvents. Different to the previous deductions, hydrogen donating efficiency and electron donating efficiency of solvents were not the decisive factors for the photolytic rate in this study, which was proved by the fast photolysis of BDE-209 in CCl4, a solvent without hydrogen and difficult to donate electrons. Besides hydrogen addition process, intermolecular polymerization might occur during the photolysis. Density functional theory (DFT) calculation was performed to understand the molecular properties of BDE-209 in different solvents. The lowest singlet vertical excitation energy (Eex) and the average formal charge on Br (q+Br) of BDE-209, reflecting the difficulty for the excitation of BDE209 and for the departing of Br atom, respectively, were changed by the reaction fields formed by the different solvents. Eex and q+Br linearly correlated with the photolytic activity (log k). This study is helpful to better understand the photolytic behavior of BDE-209 in different media.
Qing Xie Jingwen Chen Jianping Shao Changer Chen Hongxia Zhao Ce Hao
Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), Department of Environmenta Carbon Research Laboratory, Center for Nano Materials and Science, School of Chemical Engineering, S
国际会议
武汉
英文
442-446
2010-09-01（万方平台首次上网日期，不代表论文的发表时间）