Seven tribenzyltin dithiophosphates and tri[(methyldiphenylsilyl)methylene] tin dithiophosphates were synthesized .the IR, 1H, 119Sn and 31P NMR were studied. the results have shown that there are two liner relationships between chemical shift 119Sn and hammett constant of the para-substituent of the aryl groups on the dithiophosphates of the wto kinds compounds:&119Sn(CH2)=11.55σ+7.38 γ=0.988; &119Sn(Ph2MesSlCH2)=123.89σ+19.75 γ=0.986; A;; spectradata also have shown that they are four-coordination compounds.

Key words: BIOLOGICAL ACTIVITY, INFRARED SPECTROPHOTOMETRY, NMR SPECTROMETRY, BENZYL GROUP, THIOPHOSPHATE, CHEMICAL SHIFT, PHOSPHORODITHIOIC ACID P, ORGANO TIN COMPOUNDS