Abstract
The single-crystal structure of |Zn35.5|[Si121Al71O384]-FAU per unit cell, a = 24.794(1), dehydrated at 673 K and 1 × 10−6 Torr, has been determined by single-crystal X-ray diffraction techniques in the space group \( Fd\bar{3}m \) at 294(1) K. The structure was refined using all intensities to the final error indices (using the 930 reflections for which F o > 4σ(F o)) R 1 = 0.0448 (based on F) and wR 2 = 0.1545 (based on F 2). About 35.5 Zn2+ ions per unit cell are found at an unusually large number of crystallographic distinct positions, six. The 0.5 Zn2+ ion per unit cell is located at the center of double 6-ring (D6R, site I; Zn(I)-O(3) = 2.642(3) Å and O(3)-Zn(I)-O(3) = 81.23(12) and 98.77(12)°). Two different site-I′ positions (in the sodalite cavities opposite D6Rs) are occupied by 14 and 3 Zn2+ ions per unit cell, respectively; these Zn2+ ions are recessed 0.67 Å and 1.02 Å, respectively, into the sodalite cavities from their 3-oxygens plane (Zn(I′a)-O(3) = 2.094(3) Å, Zn(I′b)-O(3) = 2.23(5) Å, O(3)-Zn(I′a)-O(3) = 110.32(12)°, and O(3)-Zn(I′b)-O(3) = 100.9(30)°). Site-II′ positions (in the sodalite cavities opposite S6Rs) are occupied by 6 Zn2+ ions, each of which extends 0.63 Å into the sodalite cavities from their 3-oxygens plane (Zn(II′)-O(2) = 2.164(3) Å and O(2)-Zn(II′)-O(2) = 112.00(12)°). Twelve Zn2+ ions are found at two nonequivalent sites II (in the supercage) with occupancies of 7 and 5 ions, respectively; these Zn2+ ions are recessed 0.52 Å and 0.96 Å, respectively, into the supercage from their 3-oxygens plane (Zn(IIa)-O(2) = 2.138(12) Å, Zn(IIb)-O(2) = 2.28(4) Å, O(2)-Zn(IIa)-O(2) = 114.2(10)°, and O(2)-Zn(IIb)-O(2) = 103.7(25)°).
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Acknowledgments
The authors thank the staff at beamline 4A MXW of Pohang Light Source, Korea, for assistance during data collection. This study was carried out with the support of Cooperative Research Program for Agricultural Science & Technology Development (200901OFT102966074), RDA, Republic of Korea.
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Seo, S.M., Kim, H.S., Park, M. et al. Synthesis and structural refinement of fully dehydrated fully Zn2+-exchanged zeolite Y (FAU), |Zn35.5|[Si121Al71O384]-FAU. J Porous Mater 18, 47–56 (2011). https://doi.org/10.1007/s10934-010-9355-7
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DOI: https://doi.org/10.1007/s10934-010-9355-7