inorganic chemistry

3.0

2.0 b a a

1.0

0.0

200 300 400

l (nm)

500 600 700

A

FIG. 5. Spectral changes during the photolysis of 4.1 10
^4 M
[(NH 3 ) 5 OsII(m-N 2 )OsIII(NH 3 ) 5 ](CF 3 SO 3 ) 5 in 10
^3 M CF 3 SO 3 H under
argon at room temperature after 0 min (a), 30, 60, and 120 min (b)
irradiation times with lirr¼ 250 – 390 nm (UV filter Schott UG 11/2)
1-cm cell.

0.0

0.3

0.6

Irel

Excitation Emission

200 300 400

l (nm)

500 600

FIG. 6. Electronic excitation (lem¼570 nm) and emission
(lexc¼380 nm) spectrum of 4.1 10
^4 M [(NH 3 ) 5 OsII(m-N 2 )OsIII(NH 3 ) 5 ]
(CF 3 SO 3 ) 5 in 10
^3 M CF 3 SO 3 H under argon at room temperature after
120 min irradiation time withlirr¼ 250 – 390 nm (UV filter Schott UG
11/2), 1-cm cell, intensity in arbitrary units.

PHOTOCHEMICAL ACTIVATION AND SPLITTING OF H 2 O 363