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 language | English |
|---|---|
| Pages (from-to) | 3616-3620 |
| Number of pages | 5 |
| Journal | Chemistry - A European Journal |
| Volume | 7 |
| Issue number | 16 |
| DOIs | |
| Publication status | Published - 17 Aug 2001 |
| Externally published | Yes |
Keywords
- Calixarenes
- Coordination polymers
- Host-guest systems
- Scandium
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