Abstract: Ethylene diamine and ethanol amine react with white powdery tungstic acid to form metatungstates and paratungstates at weak acidic and neutral media respectively. Isopropyl amine forms metatungstate at pH3~7 region. The compositions of these polytugstates are shown in table 1. UV, 1R, PMR and polarographic studies have all been performed for these compounds. It has been found that only the metatungstates of ethanol amine and isopropyl amine are photosensitive. On exposure to sunlight or ultraviolat ray, significant absorption peaks appear at 620 and 860nm respectively. The decay rates concerning extinction of the peaks obey the pseudo-first order rate equation.

Key words: White powdery tungstic acid, Organic ammonium salt, Metatungstate, Polytungstate