Preparation and infrared spectra of palladium derivatives of some organophosphorus insecticides.
The preparation of palladium complexes of phosphorodithioate (Guthion, Ethyl Guthion, Imidan, and Cidial) and phosphorothioate (Fenthion) insecticides is described. The Pd : pesticide ratios in the derivatives are ca. 1 : 1 for the phosphorodithioates and 2 : 1 in the case of Fenthion. The infrared spectra of the derivatives are compared with those of the parent insecticides. Palladium complexation of phosphorodithioates results in a lowering of the PS frequencies by 60-75 cm(-1) and also produces changes in the POC region. Milligram quantities of Thimet, Trithion, and Cidial on thin-layer chromatograms were reacted in situ with sodium tetrachloropalladate(II). The infrared spectra of the compounds recovered from the plate depended greatly on the Pd : pesticide ratio on the spot, and the analytical significance of these results is discussed.
Bidleman
T F
TF
Trace Analysis Research Centre, Department of Chemistry, Dalhousie University, Halifax, Nova Scotia, Canada.
Frei
R W
RW