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- W2831498169 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. 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 $${hbox {CN}}^{-}$$ )." @default.
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- W2831498169 date "2018-07-01" @default.
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- W2831498169 title "Synthesis and anion binding properties of the smallest meso-expanded calix[4]pyrrole" @default.
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