Abstract
The smallest core expanded calix[4]pyrrole derivative (5) was synthesized via incorporation of an additional sp\(^{3}\) meso-carbon at the periphery of the macrocycle. Anion binding study of the macrocycle reveals clearly the effect of core size on its affinity towards various tested ions (\({\hbox {F}}^{-}\), \({\hbox {Cl}}^{-}\), \({\hbox {Br}}^{-}\), \({\hbox {I}}^{-}\), \({\hbox {AcO}}^{-}\), \(\hbox {H}_{2} \hbox {PO}_{4}^{-}\), \(\hbox {HSO}_{4}^{-}\), \(\hbox {ClO}_{4}^{-}\), \(\hbox {PF}_{6}^{-}\), \(\hbox {NO}_{3}^{-}\), \(\hbox {NO}_{2}^{-}\), \(\hbox {N}_{3}^{-}\) and \({\hbox {CN}}^{-}\)). The macrocycle displays the highest affinity towards fluoride and acetate ions, albeit with reduced affinities compared to parent octamethylcalix[4]pyrrole.
Graphical abstract
SYNOPSIS The first example of the smallest expanded calix[4]pyrrole is reported. Anion binding study of the macrocycle reveals clearly the effect of core size on its affinity towards various tested ions (\({\hbox {F}}^{-}\), \({\hbox {Cl}}^{-}\), \({\hbox {Br}}^{-}\), \({\hbox {I}}^{-}\), \({\hbox {AcO}}^{-}\), \(\hbox {H}_{2} \hbox {PO}_{4}^{-}\), \(\hbox {HSO}_{4}^{-}\), \(\hbox {ClO}_{4}^{-}\), \(\hbox {PF}_{6}^{-}\), \(\hbox {NO}_{3}^{-}\), \(\hbox {NO}_{2}^{-}\), \(\hbox {N}_{3}^{-}\) and \({\hbox {CN}}^{-}\)).
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Acknowledgements
This work was supported by CSIR, India (Project no. 01(2449)/10/EMR-II) and SERB, India (Project no. SB/S1/IC-56/2012). Financial and infrastructure support from the UGC, New Delhi (through the UPE and CAS programs) and the DST, New Delhi (through the PURSE and FIST programs) are gratefully acknowledged. Authors thank Center for Modelling, Simulation and Design (CMSD), University of Hyderabad, Hyderabad, India for computational facility. BSK thanks CSIR and DST India for the fellowship.
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Kumar, B.S., Panda, P.K. Synthesis and anion binding properties of the smallest meso-expanded calix[4]pyrrole. J Chem Sci 130, 90 (2018). https://doi.org/10.1007/s12039-018-1480-x
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DOI: https://doi.org/10.1007/s12039-018-1480-x