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KMID : 1059519940380050339
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Journal of the Korean Chemical Society
1994 Volume.38 No. 5 p.339 ~ p.344
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Crystal Structure of a Methanol Sorption Complex of Dehydrated Partially Cobalt(Ⅱ)-Exchanged Zeolite A
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Jang Se-Bok
Han Young-Wook
Kim Yang
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Abstract
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The crystal structure of a methanol sorption complex of dehydrated partially Co(Ⅱ)-exchanged zeolite A, Co4Na4-A·6.5CH3OH (a = 12.169(1) Å), has been determined by single-crystal X-ray diffraction techniques in the cubic space group Pm3m at 21(1)℃. Co4Na4-A was dehydrated at 360℃ and 2 × 10-6 torr for 2 days, followed by exposure to about 104 torr of methanol vapor at 22(1)℃ for 1 hr. The structure was refined to final error indices, R1 = 0.061 and R2 = 0.060 with 147 reflections, for which I > 3σ(I). In this structure, four Co2+ ions and 1.5 Na+ ions per unit cell lie at 6-ring positions: the Na+ ions are recessed 0.44 Å into the sodalite unit and the Co(Ⅱ) ions extend ca. 0.55 Å into the large cavity. 2.5 Na+ ions lie in an 8-oxygen ring plane. The 6.5 methanol molecules are sorbed per unit cell. The 6.5 methanol oxygens, all in the large cavity, associate with the 4 Co2+ ions and 2.5 Na+ ions.
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