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800
300
700
250
600
Hg(II)
Cd(II)
Zn(II)
Pb(II)
Ni(II)
200
500
400
150
300
100
200
50
100
0
0
300
350
400
450
500
550
0
0.5
1
1.5
2
wavelength (nm)
Fig. 7 (
left
) Complexation experiments with ligand 3 in CH
3
CN with Hg
2+
as triflate salts, (
right
).
Effect of 1 equiv. of metal ions on the emission at 470 nm for solutions of 6 (3.0
10
5
M) in
acetonitrile
Fig. 8 Selective sensing of ionic and covalent mercury derivatives with ligand 7
As expected, this coordination modifies the dihedral angle between both biphenyl
aromatic rings, with the corresponding modifications in fluorescent properties
(Fig.
9
).
N
N
O
O
HN
N
O
O
CO
CO
N
N
O
O
N
HN
O
O
N
N
8
9
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