Dissertation

|3.2 Bisphenanthroline: A Suitable Molecular Bridge?|
process can only be observed in the oxygen free samples which gives rise to the speculation, that
possible slow radical reaction or irreversible bridging ligand transformation might occur.
0.05
0.04
0.02
0.00
O.D.
O.D.
0.00
-0.05
-0.02
-0.10
363-382 nm
432-485 nm
569-696 nm
-0.04
0-0.3 µs
0.5-0.9 µs
0.0 0.2 0.4 0.6 0.8 1.0
t / µs
400 500 600 700
/ nm
0.01
0.01
0.00
0.00
O.D.
-0.01
.O.D.
-0.01
-0.02
-0.03
363-382 nm
435-466 nm
518-531 nm
575-596 nm
-0.02
-0.03
0-3 µs
18-80 µs
0 20 40 60 80
t / µs
400 500 600 700
/ nm
Figure 73: Derived time resolved (left) and wavelength resolved (right) excited state absorption
spectra of Ru(phenphen)Ru in oxygen saturated (top) and degassed (bottom) acetonitrile, λ exc =
355 nm (∼3 mJ/pulse); mean over 100 shots (compare figure 72). The denoted brackets indicate
the regions that were used for corresponding decay kinetics and differential spectra.
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