Dalton Transactions
Page 6 of 7
DOI: 10.1039/C3DT52824C
reaction, which leads to double addition product. The excess F-,
over 40 times higher than receptor concentration IH forms the
strong hydrogen bond with the N-H protons, thereby the ICT
absorption band has been blue shifted by 48 nm. We believe that
the concentration dependent, sensitive, and selectivity towards F-
is advantageous in terms of qualitative and quantitative detection
of anions. In absence of N-H protons, the anion sensing by IM is
due to the F- induced chemical reaction. This kind of alteration of
substrate’s reactivity by the formation of supramolecular
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Acknowledgements
The authors thank the National Science Council of Taiwan,
15 Republic of China, for financially supporting this research under
Contract No. NSC 96-2113-M-002-012-MY3. The work is also
supported by the suprainstitutional project “STRAIT” of
CSIRCLRI. This is CSIR-CLRI contribution number 1026.
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† Electronic Supplementary Information (ESI) available: [UV-vis
25 absorption spectra of IH, IM, fluorescence spectra of IM, NMR titration
results of IH and IM]. See DOI: 10.1039/b000000x/
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