Insecticidal activity studies on schief base n-salicylidene-o,s-dimethyl thiophosphonoylimine and its complexes

摘要

The Schiff base N-salicylidene-O, S-dimethylthio-phosphonoylimine and its complexes with copper (II), zinc (II) and nickel (II) have been synthesized. All the isolated new compounds have been characterized by elemental analyses, conductivity measurements, infra-red and electronic spectra. H NMR, ~(31)P NMR and MS have also been used to identify the Schiff base. It has been found that the Schiff base behaves as a bidentate ligand in coordination with the metal ions throungh its imino nitrogen and carboxylic oxygen in the expected mode. The preliminary results of insecticidal activity tests show that all the synthesized compounds have much higher pesticidal rates on poisoning Aphis fabae and Metate-tranychus ulmi, compared with Methamidophos, a commercial pesticide, which is one of the oringinal material for preparation of the Schiff base in this work.