Large colorless single crystals of analcime with diameters up to 0.20 mm have been synthesized from gels with the composition of 3.00SiO
: 8.02NaOH : 454H
O : 5.00TEA. The fully Na
-exchanged analcime have been prepared with aqueous 0.1 M NaCl (pH adjusted from 6 to 11 by dropwise addition of NaOH). The single-crystal structure of hydrated |Na
]-ANA per unit cell,
=13.703(3) Å, has been determined by single-crystal X-ray diffraction technique in the orthorhombic space group
at 294 K. The structure was refined using all intenties to the final error indices (using only the 1,446 reflections for which
=0.054/0.143. About 15 Na
ions are located at three nonequivalent positions and octahedrally coordinated. The chemical composition is Na
. The Si/Al ratio of synthetic analcime is 2.19 determined by the occupations of cations, 14.79, in the single-crystal determination work.
We gratefully acknowledge the support of beamline 4A MXW at the Pohang Light Source, Korea, for their diffraction and computing facilities. This work was supported by a grant (contract number: 2010-0119) from the Research Fund at Andong National University.
Breck D. W.
Zeolite Molecular Sieves: Structure, Chemistry, and Uses
John Wiley & Sons
Taylor W. H.
Bruker-AXS (ver. 6.12), XPREP, Program for the Automatic Space Group Determination
Bruker AXS Inc.
Madison, Wisconsin, USA
Sheldrick G. M.
SHELXL97, Program for the Refinement of Crystal Structures
University of Gottingen
Handbook of Chemistry and Physics
The Chemical Rubber Co.