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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 10, Number 5
BKCSDE 10(5)
May 20, 1989

Title	Iodine Sorption Complexes of Partially Cobalt(Ⅱ) Exchanged Zeolite A. Two Crystal Structures of Co3.5Na5Si12Al12O48·2.5I2 and Co3.5Na5Si12Al12O48·5.0I2
Author	Yang Kim*, Suk Hee Lee, Karl Seff
Keywords
Abstract	Two crystal structures of iodine sorption complexes of dehydrated partially Co(Ⅱ )-exchanged zeolite A, Co3.5Na5-A·xI2, x = 2.5 and 5.0, have been determined by single crystal X-ray diffraction techniques. Both structures were solved and refined in cubic space group, Pm3m at 21(1)℃. The structures of Co3.5Na5-A·2.5I2 (a = 12.173(1) Å) and Co3.5Na5-A·5.0I2(a = 12.130(1) Å) were refined to the final error indices, R1 = 0.081 and R2 = 0.077 with 261 reflections and R1 = 0.103 and R2 = 0.112 with 225 reflections, respectively, for which I > 3σ(I). In both structures, 3.5 Co2+ ions and 4.5 Na+ ions per unit cell lie at two crystallographically different 6-ring positions. 0.5 Na+ ion lines in an 8-oxygen ring plane. Dehydrated Co3.5Na5-A sorbs 2.5 iodine molecules per unit cell at 70℃ (vapor pressure of I2 is ca. 8.3 torr) within 30 minutes and 5 iodine molecules per unit cell at 80℃ (vapor pressure of I2 is ca. 14.3 torr) within 24 hours. Each iodine molecule makes a close approach, along its axis to framework oxygen atom with I-I-O = 175°.
Page	426 - 430
Full Text	PDF

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