Table 4. Lifetimes of the triplet states of TMPyP and P3 in the absence of oxygen tt and in aerated solutions tt(air); effect of complexation to poly(dG-dC)2 and poly(dA-dT)2. Values are given with an accuracy of 10 %.
 
 
 
buffer
poly(dG-dC)2
poly(dA-dT)2
 
tt/ms      
tt(air)/ms
tt/ms   
tt(air)/ms
tt/ms        
tt(air)/ms
TMPyP
150
1.9
1 700 a)
23.7 a)
800 b)
4.6, 18.8 b)
P3
-c)
4.0
2.3 d)
2.2 d)
-
~ 12 e)

                  a) recorded at 420 nm, 444 nm and 470 nm; R = 0.052
                  b) estimated error < 20 % due to low intensity signals, R = 0.048
                  c) no signal due to extensive porphyrin aggregation during purging the solution
                 d) low intensity signals with D Ao < 7 10-4; measured at 400 nm and 470 nm; R = 0.085
                 e) estimated value, R = 0.046