Design of Organic Structure Directing Agents for Chiral Zeolite Beta A

Daeyaert, Frits; Deem, Michael W.

doi:10.1002/slct.201900101

Cited by 5 publications

(6 citation statements)

References 28 publications

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“…The 1 H MAS and 1 H− 13 C CP-MAS spectra of the as-made R-STW are also provided in Figures S18 and S20. The consistency between the 1 H− 13 C CP-MAS spectrum of the as-made R-STW (Figure S20) and the solution-state 13 C spectrum of the synthesized OSDA 16 indicates that the structure of the chiral OSDA is completely preserved during crystallization.…”

Section: Resultsmentioning

confidence: 82%

“…The symmetry lowering from P6 1(5) 22 to P6 1(5) that was observed in the as-made pure-silica STW 15 is not observed in the NMR data. 13 C NMR data do not show the presence of amino acids within the as-prepared samples (Figure 3b).…”

Section: Resultsmentioning

confidence: 95%

“…Dried, as-made molecular sieve samples were charged into a 4-mm zirconia rotor for the MAS experiments. The sample-charged rotor was spun at an MAS rate of 8 kHz ( 1 H, 13 C, and 29 Si) or 13 kHz ( 19 F). Fourier-transform infrared (FT-IR) spectroscopy was performed using a Nicolet Nexus 470 spectrometer equipped with a mercury−cadmium−tellurium (MCT) detector.…”

Section: Methodsmentioning

confidence: 99%

“…11,12 They have also designed 175 OSDAs that stabilize one chiral form, 42 of which significantly stabilize beta A over beta B. 13 Efforts to synthesize pure beta A are ongoing.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2021

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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. 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.

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Section: Resultsmentioning

confidence: 82%

Section: Resultsmentioning

confidence: 95%

Section: Methodsmentioning

confidence: 99%

“…11,12 They have also designed 175 OSDAs that stabilize one chiral form, 42 of which significantly stabilize beta A over beta B. 13 Efforts to synthesize pure beta A are ongoing.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2021

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“…The design and synthesis of novel structure directing agents remains an important topic in the research field of chiral zeolites. [ 159 ]…”

Section: Versatile Chemistry Of Chiral Ceramic Nanostructuresmentioning

confidence: 99%

Chiral Nanoceramics

Fan

Kotov

2020

Advanced Materials

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Jinchen Fan received his Ph.D. degree from Shanghai Jiao Tong University in 2014. He is now an associate professor at Shanghai University of Electric Power, China. He joined Prof. Kotov's group as a visiting scholar from October 2017 to October 2019. His current research focus is on the fabrication of chiral nanoceramics and their applications in chiroptical activity and catalysis. 2.2. Chiral Assemblies and Soft Templates Most of organic amphiphiles can be assembled into chiral superstructures. [43] This series of superstructures can be used as soft templates in the preparation of helical ceramic nanomaterials including, SiO 2 , [44] Ta 2 O 5 , [45] TiO 2 , [46] ZrO 2 , [47] and poly(bi ssilsesquioxane) [48] via the sol-gel transcription approach. Similarly, bio-macromolecules, such as peptides and DNA can serve as templates for realizing chiral ZnO [49] and silica structures. [50] Chiral synthesis with sodium cholate (SC) also serves as a representative example of this method. Because of its amphiphilic character, SC self-assembles into a unique bilayer structure through the hydrogen bonding between hydroxyl groups. [51] Huang and co-workers [51b] used the SC assembled via coordination with calcium ions, well-defined helical nanoribbons for creating additional helical SiO 2 and ZnS by sol-gel process. Methods of chirality transfer from soft templates often include self-organization ceramic building blocks based on hydrogen bonding, van der Waals forces, π-π stacking, hydrophobic effect, electrostatic and Coulomb interactions, and metal coordination. [41] One of representative examples of chiral assembly is the preparation of chiral nanostructured silica that proceeds via Nicholas A. Kotov pioneered conceptual foundations and technical realizations of biomimetic nanostructures, which include chiral nanomaterials. Chiral ceramic nanostructures are being investigated in his laboratory for optical, magnetic, biological, and catalytic properties. His contribution to technology include nacremimetic nanocomposites including those from graphene oxide, 3D tissue replicas for drug-testing, chiral biosensors, and cartilage-like electrolytes for batteries. He is a founder of several start-up companies that commercialized bioinspired nanomaterials for biomedical, energy, and automotive technologies.

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De Novo Design of Organic Structure Directing Agents for the Synthesis of Zeolites

Daeyaert¹,

Deem²

2023

AI‐Guided Design and Property Prediction for Zeolites and Nanoporous Materials

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Design of Organic Structure Directing Agents for Chiral Zeolite Beta A

Cited by 5 publications

References 28 publications

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

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

Chiral Nanoceramics

De Novo Design of Organic Structure Directing Agents for the Synthesis of Zeolites

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