Chemistry Reference
In-Depth Information
Table 6.1 Experimental photophysical parameters at 295 K (unless otherwise stated) for
[Eu
2
(L)
3
]
n
þ
dinuclear helicates. Whenever available, standard deviations (2s) are given within
parentheses; estimated errors on quantum yields are 10-15%. See Schemes 6.1 and 6.2 for
ligand formulae.
E
0-0
(
T
)
(cm
1
at
77 K)
Q
Eu
(%)
E
(
5
D
0
!
7
F
0
)
Ligand
Solvent
t
obs
(ms)
Refs.
(cm
1
)
19 880
a
0.24(1)
a
, 2.04(5)
(77 K)
0.16
b
17 236
a
,
d
L3
MeCN
[6,39]
21 280
a
2.11(5)
a
8.6
b
17 232
a
,
c
,
d
L4
MeCN
[39]
10.8
b
L4-Cl
MeCN
21 200
1.62(1)
17 226
[42]
26.7
b
17 222
a
L4-NCS MeCN
20 090
1.62(1)
[44]
(L5)
2
20 660
e
H
2
O,
pH 7.0
2.54
24(3)
17 232
[40]
(L6)
2
H
2
O,
pH 7.4
20 920
2.2(1)
11(1)
17 235
[45]
(L7)
2
H
2
O,
pH 7.4
21 900
2.43(9)
21(2)
17 234
[46]
a
n.a.
2.36(1)
24(1)
17 233
[47]
f
21 800
2.50(3)
23(1)
n.a.
[48]
g
21 800
2.40(2)
28(1)
n.a.
[48]
(L8)
2
H
2
O,
pH 7.4
21 800
2.43(3)
19(2)
17 233
[49]
(L9)
2
H
2
O,
pH 7.4
19 950
0.54(2)
0.35
(5)
17 237
[50]
(L10)
2
H
2
O,
pH 7.4
21 150
2.52(2)
15(2)
17 242
[50]
(L11)
2
H
2
O,
pH 7.4
20 800
2.30(2)
9.0(9) 17 242
[50]
(L12a)
2
H
2
O
n.a.
1.48
n.a.
17 226
[51]
(L12b)
2
H
2
O
n.a.
1.56
n.a.
17 221
[51]
(L13a)
4
H
2
O,
pH 7.4
21 300
2.54(2)
4.6(7) n.a.
[52]
(L13b)
4
H
2
O,
pH 7.4
22 200
1.9(1)
6(2)
n.a.
[52]
(L14a)
2
H
2
O,
pH 7.4
21 400
3.23(1)
25(2)
17 241
[52]
(L14b)
2
H
2
O, pH
7.4
21 250
2.1(2)
2.5(3) n.a.
[52]
(L16)
2
DMF
20 400
0.22
5
n.a.
[43]
a
Solid state sample.
b
Some originally published quantum yield data were in error because the value used for the reference
[Eu(tpy)
3
]
3
þ
was largely underestimated due to an instrumental problem; the correct value is 32(1)%.
Consequently, quantum yield data have been recalculated.
c
Recalculated from 77 K data using a 1 cm
1
/24 K temperature dependence.
d
Average value of three different sites.
e
At 10 K.
f
Monodisperse [Eu
2
(L7)
3
]@SiO
2
nanoparticles (55
5 nm).
g
Monodisperse [Eu
2
(L7)
3
]@SiO
2
-NH
2
nanoparticles (90
10 nm).
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