inorganic chemistry

( 94 ). Chlorophyllawith a Qy-band atlmax¼665 nm ( 95 ) is the
magnesium complex of the dihydroporphyrin derivative 3
already shown in Fig. 3. The chemically quite different
structures of compounds 7 and 8 are given in Fig. 9.

400 500 600

l (nm)

300 700 800

0.0

0.5

1.0

e×

10

–5

( L mol

–1

cm

–1

)1.5

FIG. 8. Electronic spectrum of bacteriochlorophylla(----) extracted
from antenna complexes of purple bacteria compared to the spectrum
of a synthetic phthalocyanine metal complex (___). Reproduced with per-
mission from Ref. ( 5 ). Copyright Wiley-VCH.

FIG. 9. Structures of robust biomimetic photosensitizers with chloro-
phyll-like excited state properties (93,94).

PHOTOSENSITIZATION AND PHOTOCATALYSIS 249