Scandium(III) coordination polymers containing capsules based on two p-sulfonatocalix[4]arenes

Helen R. Webb, Michaele J. Hardie, Colin L. Raston

Research output: Contribution to journalArticlepeer-review

80 Citations (Scopus)

Abstract

Reactions of sodium p-sulfonatocalix[4]arene and scandium(III) tristriflate in the presence, and absence, of [18]crown-6 give the crystalline complexes [Sc2(μ-OH)2(H2O)10] {Na4(H2O)8-[calix[4]arene(SO3) 4]2} · 13H2O and {[Sc2(μ-OH)2(H2O)8] [Sc(H2O)4]2[calix[4]-arene(SO3) 4-H+]2([18]crown-6)} · 16 H2O. Both complexes involve novel coordination polymers with calixarene units linked through sodium or scandium centers and also feature capsule assemblies through to the head-to-head association of calixarenes. A linear array of capsules associated with an infinite chain of aquo-bridged sodium ions, and an aquated hydroxy-bridged scandium(III) dimer, [Sc2(μ-OH)2(H2O)10] 4+, are found in the absence of the crown ether. In the presence of [18]crown-6 both hydrated scandium monomers and dimers bridge between calixarenes in a two-dimensional coordination network. The crown ethers reside in cavities created by two calixarenes from adjacent polymeric sheets via a variety of supramolecular interactions(hydrogen-bonding, shape complementarity), and effectively add a third dimension to the network. The extended structure of both of these polymers is highly porous, and resembles a bilayer.

Original languageEnglish
Pages (from-to)3616-3620
Number of pages5
JournalChemistry - A European Journal
Volume7
Issue number16
DOIs
Publication statusPublished - 17 Aug 2001
Externally publishedYes

Keywords

  • Calixarenes
  • Coordination polymers
  • Host-guest systems
  • Scandium

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