title: Different reaction mechanisms of diphenylether and 4-bromodiphenylether with nitrous acid in the 355 nm laser flash photolysis of mixed aqueous solution.
abstract: The microscopic reaction mechanisms of diphenylether (DPE) and 4-bromodiphenylether (4-BrDPE) with nitrous acid (HNO(2)) in the absence of O(2) have been explored by the 355nm laser flash photolysis. It was proposed that OH radical, from the photolysis of HNO(2), added to DPE forms the C(12)H(10)O-OH adduct while added to 4-BrDPE forms the 4-BrDPE-OH and 4-BrOH-DPE adducts. The first-order decay rate constants of the C(12)H(10)O-OH adduct, 4-BrDPE-OH adduct and 4-BrOH-DPE adduct were measured to be (1.86+/-0.14)x10(5)s(-1), (2.19+/-0.04)x10(5)s(-1) and (1.56+/-0.03)x10(5)s(-1), respectively. The final photolysis products of DPE and HNO(2) identified by GC/MS analysis were phenol, o-hydroxydiphenylether, p-hydroxydiphenylether and p-nitrodiphenylether, while the final photolysis product of 4-BrDPE and HNO(2) identified by LC/MS analysis was mainly the dimer.
authors.affiliation: Department of Environmental Science and Engineering, Institute of Environmental Science, Fudan University, Handan Road 220, Shanghai 200433, PR China.
authors.forename: Ping
authors.initials: P
authors.lastname: Li
authors.forename: Wenbo
authors.initials: W
authors.lastname: Dong
authors.forename: Renxi
authors.initials: R
authors.lastname: Zhang
authors.forename: Li
authors.initials: L
authors.lastname: Huang
authors.forename: Zhaolian
authors.initials: Z
authors.lastname: Ye
authors.forename: Huiqi
authors.initials: H
authors.lastname: Hou
mesh_terms: D002853:Chromatography, Liquid; D008401:Gas Chromatography-Mass Spectrometry; D007834:Lasers; D015394:Molecular Structure; D009608:Nitrous Acid / Q000737:chemistry* / Q000528:radiation effects; D010647:Phenyl Ethers / Q000737:chemistry* / Q000528:radiation effects; D010782:Photolysis; D021241:Spectrometry, Mass, Electrospray Ionization; D053719:Tandem Mass Spectrometry
chemical_list: D010647:Phenyl Ethers; D009608:Nitrous Acid