Chemistry Reference
In-Depth Information
Terminal Ligands
N
N
N
N
NH
N
N
N
N
N
N
NH
N
N
N
N
N
N
HAT
TAP
dppz
bpy
phi
R
R
R
N
NH
NH
N
N
N
NH
NH
N
N
N
N
N
R
R
R
phen, R = H
Me
4
phen, R = Me
tpy
Ph
2
phen, R = H
dsdp, R = SO
3
-
chrysi
phzi
N
N
N
N
N
N
N
N
N
N
N
N
N
N
ddz
PHEHAT
DAP
Bridging Ligands
N
N
N
N
N
N
N
N
N
NN
N
N
N
N
N
dpb
dpq
bpm
dpp
Figure 8.8
Polyazine ligands commonly used in the synthesis of transition metal complexes
for the photomodifi cation of DNA
features similar to the tris(chelate) systems. Emission quantum effi ciencies from the
3
MLCT states of these complexes, however, are often orders of magnitude smaller.
For example, the F
p
of [Ru(bpy)
3
]
2+
at room temperature is 0.06 versus F
p
= 0.002
reported for [(bpy)
2
Ru(NH
3
)
2
]
2+
at 157 K.
19,22
This reduction in emission for
[(bpy)
2
Ru(NH
3
)
2
]
2+
is due to the more rapid interstate conversion between the
