Lower rim 1,3-di-amide-derivative of calix[4]arene possessing bis-{N-(2,2′-dipyridylamide)} pendants: a dual fluorescence sensor for Zn2+ and Ni2+
Graphical abstract
Single crystal XRD structure of the lower rim 1,3-di-amide-derivative of calix[4]arene possessing bis-{N-(2,2′-dipyridylamide)} pendants (L) exhibits two distinct binding cores, viz., N4 and O6. L was found to be selective to Zn2+ by switch-on and to Ni2+ by switch-off fluorescence by forming 1:1 complexes, where the lowest Zn2+ and Ni2+ concentration detection limits are 142 and 203 ppb, respectively. The coordination aspects of these complexes have been addressed based on computational calculations.
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Acknowledgements
C.P.R. acknowledges the financial support from DST, CSIR and DAE-BRNS. R.J. gratefully acknowledges UGC for SRF. We thank Dr. Amjad Ali for an initial sample of L. We also thank SAIF, IIT Bombay, for ESI MS data.
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