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Further Investigations of Racemic and Chiral Molecular Sieves of the STW Topology

Journal Article · · Chemistry of Materials
 [1];  [2];  [3];  [2];  [4]
  1. California Institute of Technology (CalTech), Pasadena, CA (United States); Seoul National University (Korea, Republic of); Rice University
  2. ETH Zurich (Switzerland)
  3. Rice University, Houston, TX (United States)
  4. California Institute of Technology (CalTech), Pasadena, CA (United States)
Large single crystals of pure-silica STW-type molecular sieves are prepared using 1,2,3,4,5-pentamethylimidazolium (12345PMI) and 2-ethyl-1,3,4-trimethylimidazolium (2E134TMI) as organic structure-directing agents (OSDAs) and α-amino acid additives. The effects of the amount and type of amino acid on the crystallization of pure-silica STW materials are investigated. Room-temperature single-crystal X-ray diffractometry shows that 12345PMI better fits the STW cage than 2E134TMI and is fully consistent with computed simulations. The synthesis of an enantioenriched R-STW-type molecular sieve having a Si/Ge ratio of 2.2 is achieved using a chiral, dicationic OSDA that contains two stereocenters. Furthermore, the conformation of the chiral OSDA in the chiral framework has been obtained from a Rietveld refinement using synchrotron powder diffraction data and is the first structure refinement of an enantioenriched, inorganic molecular sieve prepared from a pure, asymmetric OSDA.
Research Organization:
Rice Univ., Houston, TX (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
SC0019324
OSTI ID:
1846400
Journal Information:
Chemistry of Materials, Journal Name: Chemistry of Materials Journal Issue: 5 Vol. 33; ISSN 0897-4756
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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