Abstract
The synthesis, structure solution, and characterization of the aluminosilicate MCM-61 are described. MCM-61 is synthesized hydrothermally using 1,4,7,10,13,16-hexaoxacyclooctadecane (18-Crown-6) in the presence of potassium cations. The structure solution of MCM-61 shows that the material is a clathrate with a novel structure formed from [6 104 12] polyhedral cages. The Rietveld refinement of synchrotron X-ray powder diffraction data of the as-synthesized material gives a space group assignment of R3̄ m (No. 166) with unit cell parameters a=11.841 Å and α=93.29°, and agreement values of R p=5.33%, R wp=7.04%, and χ 2=0.43. The [6 104 12] cages connect together to form large [6 204 6] cages which host the potassium-18-Crown-6 complex. These [6 204 6] cages contain 18-membered rings, making MCM-61 the first aluminosilicate clathrate to possess cages bounded by 18-membered rings. The structure of MCM-61 suggests that crown ethers may be useful molecules for the synthesis of extra-large pore zeolites.
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