| 研究実績の概要 |
First, the control of the zeolitic layer stacking with different crystal symmetry elements was focused in this research. Under controlled conditions, the “dimer” and “monomer” organics of 1-ethyl-3-methylimidazolium selectively direct different, but related, germanosilicates, the ECNU-16 with a new topology and the existing IM-16 with the UOS topology, respectively. The comprehensive computational study based on the molecular mechanic simulations revealed that the zeolite phase selectivity was determined by the unique space-filling behavior of the “dimer” and “monomer” organics, which was closely correlated with their rotation freedom, as well as the included volume of host zeolite channels.
On the other hand, a Ge-recycling strategy that realized the topotatic transformation between different lamellar zeolitic precursors (fer-type and pcr-type) through three-dimensional (3D) germanosilicate UTL was discovered in this research. The discovery of this Ge-recycling process enabled to switch the lamellar zeolitic precursor from one structure to the other, both of which could be further derived of diverse zeolites. This study established new relationships not only between structurally distinct lamellar zeolites but also two families of zeolitic materials.
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