Question

Explain photosensitized reaction with example and give its mechanism

Answer 1

Absorbance(at 228 nm) of a solution of benzonitrile in ethanol is what 1.3 molar absorptivityA policeman starts to chase a thief who has 100 meters head start. If the policeman can manage to run a kilometer in 8 minutes, and the thief a kilometer in 10 minutes, how far will the thief have gone before he is caught by the policeman?Explain photosensitized reaction with example and give its mechanism

Answer 2

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Photosensitized reactions are photochemical reactions in the presence of sensitizers. The function of a sensitizer is to transfer energy or to participate in photochemical reactions to form a radical, which then reacts with reactants and converts back to the sensitizer. In many inorganic photochemical reactions, mercury is a common sensitizer. Upon light irradiation, mercury is excited and becomes excited mercury. The excited mercury collides with reactant molecules and transfers the energy to the reactant molecules to make them more reactive.

2B2H6 + Hg(3P1) → B4H10 + H2

2SiH4 + Hg(3P1) → Si2H6 + H2

2GeH4 + Hg(3P1) → Ge2H6 + H2



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