The present study considers silver ion promoted hydrolysis of Diazinon (1  ), with Ag+ selected for its ability to complex organic ligands common to Organophosphorus (OP) pesticides. Chemical fate of OP pesticides is influenced by several factors, one being the chemistry of their aquatic environment. Dissolved metal ions are known to play a varied role in affecting rates and transformations of phosphate ester hydrolysis reactions. 1  , 2   Various postulates embrace the tendency of certain metal ions to coordinate Lewis sites as a defining feature in their facility to enhance OP pesticide hydrolysis rates. 3, 4  Figure 1  depicts the likely modes of Mn+coordination. ESI-MS and 1H, 31P NMR were employed to probe the molecular interactions between silver ions and 1  , with spectral evidence presented for the formation of a bidentate chelate between Ag+ and 1  . Furthermore, 31P and 1H NMR revealed significant rate enhancements of 1  in the presence of Ag+and NMR product analysis allowed transformational pathways to be proposed.1   Kelleher, B.;   A, Esbata.; Buncel, E.  Rapidly formed Quinalphos complexes with transition metal ions characterized by electrospray ionization mass spectrometry. Rapid Communications in Mass Spectrometry. 2013, 27, 1319-28.2   Pehkonen, S. O.; Zaher, M.; Judah, A. Mechanism of Interactions between Hg2+and Demeton S: AnNMR Study. Environ. Sci. Technol. 2005, 39, 2586-2591.3  Smolen, J. M.; Stone, A.T. Divalent metal ion-catalyzed hydrolysis of phosphorothioate ester pesticides and their corresponding oxonates. Environ. Sci. Technol. 1997, 31, 1664-1673.4 Koo, I. S.; Ali, D.; Yang, D.; vanLoon, G. W.; Buncel, E. Theoretical and experimental 31P NMR and ESI-MS study of Hg2+binding to Fenitrothion. Bull. Korean Chem. 2009, 30, 1257-1261.

Silver ion promoted hydrolysis of organophosphorus pesticide, diazinon

248th National Meeting (2014)

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