Jump to main content
Jump to site search
PLANNED MAINTENANCE Close the message box

Scheduled maintenance work on Wednesday 21st October 2020 from 07:00 AM to 07:00 PM (BST).

During this time our website performance may be temporarily affected. We apologise for any inconvenience this might cause and thank you for your patience.


Issue 12, 2012
Previous Article Next Article

Spectroscopic studies on the photochemical decarboxylation mechanisms of synthetic pyrethroids

Author affiliations

Abstract

A novel radical trapping technique combined with a fluorescence spectroscopic analysis has been employed to investigate the radical intermediates produced by photodecarboxylation of four synthetic pyrethroids: fenvalerate (SMD), fenpropathrin (DTL), cyphenothrin (GKL), and cypermethrin (AGT). Under photoirradiation at >290 nm, all pyrethroids underwent direct photolysis via homolytic cleavage of the carbon–oxygen bonds in the ester groups. The consumed amount of a nitroxide free radical, as a trapping agent for the intermediate radical of a pyrethroid, was determined by ESR, which was the measure of the reaction yield of a photochemically generated α-cyano-3-phenoxybenzyl radical common to all pyrethroids. The reactivities of the pyrethroids studied was in the sequence of SMD ≫ DTL > GKL > AGT. Furthermore, nanosecond transient absorption spectroscopy demonstrated that geminate recombination of the radical pair within a solvent cage is the main deactivation route of the photochemically generated α-cyano-3-phenoxybenzyl radical common for all pyrethroids studied.

Graphical abstract: Spectroscopic studies on the photochemical decarboxylation mechanisms of synthetic pyrethroids

Back to tab navigation

Article information


Submitted
27 Jun 2012
Accepted
09 Aug 2012
First published
10 Aug 2012

Photochem. Photobiol. Sci., 2012,11, 1897-1904
Article type
Paper

Spectroscopic studies on the photochemical decarboxylation mechanisms of synthetic pyrethroids

Y. Suzuki, S. Ishizaka and N. Kitamura, Photochem. Photobiol. Sci., 2012, 11, 1897
DOI: 10.1039/C2PP25218J

Social activity

Search articles by author

Spotlight

Advertisements