Current time in Korea 22:19 Apr 19 (Fri) Year 2024 KCS KCS Publications
KCS Publications
My Journal  Log In  Register
HOME > Search > Browsing(JKCS) > Archives

Journal of the Korean Chemical Society (JKCS)

ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 55, Number 4
JKCSEZ 55(4)
August 20, 2011 
 
Title
 Synthesis of Single Crystalline Analcime and Its Single-crystal Structure,
|Na0.94(H2O)|[Si2.06Al0.94O6]-ANA: Determination of Cation Sites, Water Positions,
and Si/Al Ratios

결정성 아날심(|Na0.94(H2O)|[Si2.06Al0.94O6]-ANA)의 합성 및 단결정구조: 양이온 및
물 분자의 위치, Si/Al 비의 결정
Author
 Sung Man Seo, Jeong Min Suh, Seong Oon Ko, Woo Taik Lim*

서성만, 서정민, 고성운, 임우택*
Keywords
 아날심, 제올라이트, 구조, 단결정, Si/Al 비 , Analcime, Zeolite, Structure, Single-crystal, Si/Al ratio
Abstract
 최대 0.20 mm 크기를 가진 아날심 단결정은 3.00SiO2 : 1.50NaAlO2 : 8.02NaOH : 454H2O : 5.00TEA의 겔 조성으로부 터 합성되어졌다. Na+ 이온으로 완전히 이온교환 된 아날심은 0.1 M 농도의 NaCl 수용액으로부터 준비하였다(이온교환용 액의 pH는 NaOH 용액을 첨가하여 6에서 11로 맞추었다). |Na0.94(H2O)|[Si2.06Al0.94O6]-ANA(a=13.703(3) A)의 분자식을 가지 는 수화된 아날심 단결정의 구조는 294 K에서 Ibca의 orthorhombic 공간군으로 단결정 X-선 회절기법에 의해 결정되었다. 결정 구조의 최종 에러값은 R1/wR2= 0.054/0.143에 수렴되었다. 약 15개의 Na+ 이온이 팔면체 배위로 3군데의 비동등한 위 치에서 발견되었다. 합성된 아날심의 화학적 조성은 Na0.94(H2O)Si2.06Al0.94O6 확인되었으며, Si/Al 비는 단결정 구조 정밀화 를 통하여 찾은 양이온의 점유수인 14.79개에 의해 2.19로 결정되었다.

Large colorless single crystals of analcime with diameters up to 0.20 mm have been synthesized from gels with the composition of 3.00SiO2 : 1.50NaAlO2 : 8.02NaOH : 454H2O : 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 |Na0.94(H2O)|[Si2.06Al0.94O6]-ANA per unit cell, a=13.703(3) A, has been determined by single-crystal X-ray diffraction technique in the orthorhombic space group Ibca at 294 K. The structure was refined using all intenties to the final error indices (using only the 1,446 reflections for which Fo > 4σ(Fo)) R1/wR2 = 0.054/0.143. About 15 Na+ ions are located at three nonequivalent positions and octahedrally coordinated. The chemical composition is Na0.94(H2O)Si2.06Al0.94O6. The Si/Al ratio of synthetic analcime is 2.19 determined by the occupations of cations, 14.79, in the single-crystal determination work.

Page
 570 - 574
Full Text
 PDF

How to access to the WOL for The Bulletin of the Korean Chemical Society ?

The Bulletin of the Korean Chemical Society will be co-published with Wiley-VCH from 2015 towards. The online version of the Journal will thus be available on Wiley Online Library, Wiley(-VCH)'s global online platform.

KCS members can get a free online access to the Bulletin of the Korean Chemical Society in WOL.

Close