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absorption spectrum of 7 probably due to release of copper from
the sensing system due to demetalation. The experiments were re-
peated twice with the same final outcome (SI, Fig. S9).
According to Benesi–Hildebrand plot, linearity was observed
between 1/(A-Ao) versus 1/[Cu2+] indicating the formation of 1:1
complex between 7 and target ion which was further confirmed
by Job’s continuous variation plot experiment. (SI, Fig. S10) The
binding constant of 7 with Cu2+ in CH3CN/H2O (1/1/, v/v) was cal-
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In conclusion, we have synthesized and characterized novel
fluorescein appended calix[4]arene receptors for their potential
utilization as chemical sensors. Among the two fluorescein ap-
pended calix[4]arene frameworks, 7 is found to be extremely sen-
sitive toward Cu2+ and recognizes it through 1:1 stoichiometry
with high binding affinity.
Acknowledgments
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R.S. thanks CSIR, India for fellowship. Financial assistance from
DST, MFPI, MOEF and MHRD is gratefully acknowledged.
Supplementary data
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