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Article: [sup.31]P NMR and ESI-MS studies of metal ion-phosphorus pesticide residue complexes.(Report)
- Article from:
- Canadian Journal of Chemistry
- Article date:
- February 1, 2009
- Author:
CopyrightCOPYRIGHT 2009 NRC Research Press. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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Introduction
Due to their biological and environmental importance, the degradation of organophosphorus (OP) pesticides has been studied extensively over the past several decades. (1) In addition to investigation of the pathways and mechanisms of degradation, metal ion-promoted hydrolysis has also been of interest. (1e,1f) Organophosphorus esters are known to undergo a variety of hydrolysis mechanisms. At the phosphorus centre, three possible mechanisms have been identified: unimolecular nucleophilic substitution, [S.sub.N]1(P), formation of a pentacoordinate intermediate (addition-elimination), and bimolecular concerted nucleophilic substitution, [S.sub.N]2(P). ...