Photoprocesses involving Ions

Such a photoprocess could involve the reaction of the excited state Mo2(02P(OPh)2)4 as a diradical, whereby it abstracts a chlorine atom from 1,2-dichloroethane. Alternately, the excited state Mo2(C>2P(OPh)2)4 could act as a reducing agent to give chloride ion and the alkyl radical. The quantum yield of the reaction is decreased if the photoreaction is carried out in a coordinating solvent such as THE or acetonitrile because such compounds coordinate into the axial coordination position of the excited state dimer, which is the site of reactivity. 

Since the extinction coefficient of Eu " is much greater than that of Eu ", the reverse reaction becomes more efficient as the concentration of the Eu " ion in solution increases. The primary photoprocess in the photolysis of aqueous solutions of Eu " involves the generation of hydroxyl radicals ... 

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