Study on Transient Products Induced by Pulse Radiolysis of Cytosine Aqueous Solution Saturated with N₂O

On the basis of detemining the characteristic absorption of cytosine anion radical (Cyt^·),we studied the Cyt aqueous solution using the pulse radiolysis and e_aq^- savenger N₂O.Results showed that the two characteristic absorptions of Cyt were also produced,that was characteristic absorption of Cyt^· located at λ=335±5nm and the characteristic absorption for protonated products of Cyt^·.Cyt^· decayed follwing the first order kinetics,but slower than it did at the same pH value solution saturated with N₂.We suspected that N₂O^- can produce the EDA complex of electron transfer with Cyt,this EDA complex leads to the blue movement of the characteristic absorption,and that the pH rised with the reaction of N₂O^- and H₂O leads to the increase the τ/2 of Cyt^·.