J. Li et al. / Spectrochimica Acta Part A 72 (2009) 1062–1065
1065
Table 1
Association constants for various anions toward receptor 1 in DMSO and 9/1 DMSO/H2O (v/v) at 298.2 0.1 K, respectively.
−
Anionsa
F−
H2PO4
AcO−
Cl−
Br−
I−
b
d
Kass (M−1
Kass (M−1
)
)
3.71( 0.27) × 105
8.32( 0.52) × 104
1.67( 0.13) × 105
3.16( 0.55) × 102
NDc
ND
ND
ND
ND
ND
8.34( 0.57) × 103
1.03( 0.11) × 102
a
The anions were added as their tetrabutylammonium salts.
Kass was determined in dry DMSO.
ND indicated that the spectra showed little or no change with the addition of anion so that the association constants cannot be determined using the spectra.
Kass was determined in 9:1 DMSO:H2O solution.
b
c
d
4. Conclusion
In summary, we have succeeded in presenting a new kind of
colorimetric chemosensor, which showed strong binding affinity as
well as a good sensing ability and selectivity for fluoride ion in aque-
ous (10% water) solution. This outstanding property was bolstered
by UV–vis and 1H NMR titration experiments.
Acknowledgements
This project was supported by the National Natural Science
Foundation of China (20371028, 20671052).
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