Further Investigations of Racemic and Chiral Molecular Sieves of the STW Topology
Journal Article
·
· Chemistry of Materials
- California Institute of Technology (CalTech), Pasadena, CA (United States); Seoul National University (Korea, Republic of); Rice University
- ETH Zurich (Switzerland)
- Rice University, Houston, TX (United States)
- 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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