Abstract
1:12 tungstates are photosensitive in near visible and ultra-violet areas at the oxygen to metal charge transfer bands, in the presence of a great variety of organic reagents. Photosensitivity results in multi- electoral reduction of tungstates with concomitant oxidation of oganic compounds. Photosensitivity follows the order PW 12O 4o 3− > SiW 12O 4o 4− > FeW 12O 4o 5− > H 2W 12O 4o 6−, which is the same order with the increasing negative redox potentials. Maximum quantum yield ∼ 15% is obtained with high concentrations of organic reagents (1–10 M). The reduced heteropoly compounds (HPC) are eacily re-oxidized by atmospheirc oxygen. They are also capable of reducing hydrogen ions and this limits the extent of photoreduction.
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