6
24
W. Wei et al. / Spectrochimica Acta Part A 77 (2010) 620–624
and a large downfield from 10.46 to 12.60 ppm can be observed.
However, the signal of CH proton at 6.24 ppm was almost invari-
able. These results indicated that hydrogen bonding interactions
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−
−
−
receptor 1 can bind with F , AcO or H PO4 by multiple hydrogen
2
bonding interactions, whereas, the interactions of receptor 1 with
[
−
−
−
−
Cl , Br , HSO
and ClO4 were too weak to calculate the asso-
4
ciation constants by UV and fluorescence spectroscopy in diluted
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[
3
Acknowledgement
[
(
We gratefully acknowledge the support from the National Nat-
ural Science Foundation of China (no. 20672121).
[
1