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intensity gradually increased. As 2,2
¢
-bipyridine is a stronger
2+
chelating ligand and it removed Ni
ion from the N
pocket of
4
11
and PET disappeared and thus the fluorescence intensity was
regained. This introduced a new prospect of using Cu
2+
2+
ions
as tunable parameters for the change of one physical property of the
molecule, and hence these ions can be used as triggers to switch the
fluorescence of the macrocycle
and Ni
11
.
Figure 9.6
Quenching of fluorescence intensity of
10
-5
M in
methanol) by the gradual addition of (a) Cu
2+
0.733
11
(3
×
10
-3
M
×
-3
2+
-3
-3
to 6.39
×
10
M; (b) Ni
0.631
×
10
M to 2.776
×
10
M.
Figure 9.7
(a) Fluorescence spectra of
11
(3
×
10
-5
M) in methanol after
10
-3
M to 18.83 × 10
-3
M Zn
2+
.
(b) Fluorescence enhancement after gradual addition of 2,
2
gradual addition of 0.68
×
¢
×
10
-5
M) and Ni
2+
(2.776
-bipyridine to a mixture of
11
(3
×
10
-3
M).
9.2.3
Self-Assembly of Neutral Molecular Rectangles
The nitrate analogue (
3
) of Pd
II
2
shape-selective organometallic
molecular clip
2
was designed and synthesized by our group exactly
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