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500
400
22
+ CF
3
COOH
300
Free
22
200
22
+ NiCl
2
100
300
350
400
450
500
550
Wavelength (nm)
Fig. 22 Fluorescence spectra of
free, protonated (immediately after protonation) and
Ni
2
รพ
complexed ligand 22
Table 1 Stoichiometry and the overall binding constants (log b) in DMSO for 22-24 with various
anions measured by UV-Vis spectroscopy at 25
C
22
23
24
Anion
a
Log
b
L:A
Log
b
L:A
Log
b
L:A
Oxalate
7.2
0.2
1:2
6.0
0.7
1:1
7.7
0.3
1:2
Malonate
7.7
0.1
1:2
5.7
0.6
1:1
8.9
0.2
1:2
Succinate
7.0
0.2
1:2
6.2
0.7
1:1
7.9
0.2
1:2
Acetate
7.4
0.1
1:2
8.3
0.1
1:2
-
-
a
All the anions were used as their TBA salts
R
O
O
N
N
H
H
N
S
N
N
Nf
S
N
N
Nf
S
N
H
O
N
S
N
Ph
Ph
H
O
H
H
N
N
O
H
H
O
O
O
R
Fig. 23 Geometry of the 1:1 and 1:2 complexes
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