Mapping out the diversity of lanthanide(III) coordination complexes involving p-sulfonatocalix[4,6]arenes

Irene Ling, Mohamed Makha, Alexandre N. Sobolev, Yatimah Alias, Colin L. Raston

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    Structurally authenticated complexes of the cone-shaped p-sulfonatocalix[4]arene and conformationally flexible p-sulfonatocalix[6]arene devoid of co-ligands/ancillary molecules are limited. Early and late members of the lanthanide series as their trivalent ions, La3+, Er3+, and Yb3+, form complexes from aqueous media under these conditions. For La3+ and Er3+, distinct hydrophobic and hydrophilic bilayers are formed with p-sulfonatocalix[4]arene, whereas for Yb3+, two complexes form that deviate from the well-known bilayer arrangement of calixarenes. Replacing the calixarene with p-sulfonatocalix[6]arene results in a hydrogen-bonded network with alternating hydrophobic-hydrophilic layers associated with primary coordination of Yb3+, with the larger macrocyclic calixarene in a partial cone conformation.

    Original languageEnglish
    Pages (from-to)570-578
    Number of pages9
    JournalAustralian Journal of Chemistry
    Issue number6
    Publication statusPublished - 19 Mar 2020

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