1734
M.R. Rao et al. / Tetrahedron 66 (2010) 1728–1734
Handbook of Experimental Pharmacology XX/1, Part 1; Springer: Berlin, 1969, pp
141-172; (c) Dreisbuch, R. H. Handbook of Poisoning; Lange Medical: Los Altos,
CA, 1980.
calcd for C26H29BF2N2Si2Na 497.1828, found 497.1814; CHN calcd:
C-65.81, H-6.16, N-5.90, Obsd, C-66.20, H-5.85, N-5.80.
´
´
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4.3. Procedure for anion sensing
Stock solutions of the anions (2.0 mM) were prepared in
methanol and stock solution of 1 (1 mM) was prepared in CH2Cl2.
For absorption measurements, the stock solution of 1 was diluted to
8
mM with CH2Cl2. Titration experiments were performed by plac-
ing 2.5 mL of solution 1 (8 M) in a quartz cuvette of 1 cm optical
m
path length, and various amounts of anions were added in-
crementally by means of a micro-pipette. For fluorescence mea-
surements, 2 mM concentration of 1 was used. Excitation was
provided at 425 nm, and emission was collected from 500–700 nm.
Acknowledgements
M.R. thanks CSIR and DST for financial support. MRR thanks CSIR
for fellowship. We thank the DST funded National Single Crystal X-
ray Diffraction Facility for diffraction data.
Supplementary data
´
M. R.; Sanceno´ n, F. Coord. Chem. Rev. 2006, 250, 3081–3093.
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Supplementary data associated with this article can be found in
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