Controlling the conformation and interplay of p-sulfonatocalix[6]arene as lanthanide crown ether complexes

Scott J Dalgarno, Michaele J Hardie, Mohamed Makha, Colin L Raston

Research output: Contribution to journalArticle

64 Citations (Scopus)

Abstract

Control over the conformational flexibility of p-sulfonatocalix[6]arene in the solid state is possible in the presence of varied stoichiometric amounts of [18]crown-6 and selected lanthanide(III) chlorides. Complexes 1 and 2 have the calixarene in the elusive ``up-up'' double cone conformation, whilst complex 3 has the calixarene in the centrosymmetric ``up-down'' double partial cone conformation, whereby it acts as a divergent receptor. Complex 1 has a double ``molecular capsule'' arrangement which is composed of two p-sulfonatocalix[6]arenes shrouding two [18]crown-6 molecules, also with both coordinated and homoleptic aquated lanthanide ions around the hydrophilic sultonate rims of the calixarenes. Complex 2 has a ``ferris wheel'' arrangement with one lanthanide metal centre coordinated to a sulfonate group and another coordinated to the crown ether whilst tethered to a sulfonate group of the calixarene. Complex 3 forms from a solution with large excess of [18]crown-6, and possesses a crown ether molecule in each of the partial cones and has homoleptic aquated lanthanide ions involved in a complicated hydrogen-bonding regime within the extended structure.
Original languageEnglish
Pages (from-to)2834-2839
Number of pages6
JournalChemistry - A European Journal
Volume9
Issue number12
DOIs
Publication statusPublished - 16 Jun 2003

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