Dissertation

|3.2 Bisphenanthroline: A Suitable Molecular Bridge?|
363-382 nm 432-485 nm
569-696 nm
0.0
0.2
0 - 0.3 µs
t / s
0.4
0.6
0.5 - 0.9 µs
0.8
400 500 600 700
/ nm
363-382 nm 435-466 nm 518-531 nm
575-696 nm
0
0 - 3 µs
20
t / s
40
60
18 - 80 µs
80
400 500 600 700
/ nm
Figure 72: False color plots showing the change in optical density during the decay of the 3 MLCTexcited
Ru(phenphen)Ru species in oxygen saturated (top) and degassed (bottom) acetonitrile
after the laser excitation at 355 nm (∼3 mJ/pulse, seen as blue spot at t = 0, 100 accumulations).
Yellow and red areas refer to an increase of the optical density (excited-state absorption), green and
blue areas represent a decrease of the optical density (ground state depletion) and black regions
show no change compared to the initial solution. The denoted brackets indicate the regions that
were used for decay kinetics and differential spectra (compare figure 73 and see text for details).
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