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
|