Journal
CRYSTENGCOMM
Volume 10, Issue 11, Pages 1560-1564Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/b805628e
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Funding
- National Natural Science Foundation of China [20490210, 206301040, 20602035, 20771099]
- MOST of China [2006CB601103, 2006DFA42610]
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The reactions of sodium p-sulfonatocalix[4]arene (Na5L) and terbium/europium(III) chloride in the presence of pyrazine-N,N'-dioxide (PNNO) in aqueous solutions gave the crystalline complexes 1 and 2. Both structures contain molecular capsules of p-sulfonatocalix[4] arene with PNNO as guest molecules in the cavity of the calix[4]arenes. The molecular capsules are connected through sodium and terbium (or europium) centers forming a three-dimensional framework. The yellow crystals from an aqueous solution containing Na5L and lanthanum(III) chloride reacted with PNNO in aqueous solutions, giving crystals of complex 3. Compound 3 is a special mixed A-B type layer framework of p-sulfonatocalix[4]arene. The structure of compound 3 is made up of two types of bilayered p-sulfonatocalix[4]arene with opposite charges. The two types of layers (in presence or absence of sodium centers) alternate with each other forming a mixed A-B type double bi-layer framework which is uncommon in the layer structure of p- sulfonatocalix[4]arene.
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