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Issue 48, 2019
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Synthesis of a germanosilicate zeolite HPM-12 using a short imidazolium-based dication: structure-direction by charge-to-charge distance matching

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Abstract

A short imidazolium based dication, with only three methylene units in the spacer linker, selectively directs the crystallization of zeolite HPM-12 (*UOE) as long as there is enough germanium present in the synthesis gel. The integrity of the dication is proved by dissolution of the zeolite and 1H and 13C NMR spectroscopy, where significant effects of organic dication concentration and the presence and concentration of HF need to be taken into account. For the as-made HPM-12 zeolite, a large shift of 9 ppm of one resonance in the 13C MAS NMR spectrum is due to the particular conformation of the dication imposed by confinement in the zeolite framework, as found by DFT calculations. The structure-directing ability of this kind of dication with varying length of the linker suggests that matching of the distance between positive charges (imidazolium moieties) and negative charges (double four rings in which fluoride resides) plays a crucial role during crystallization.

Graphical abstract: Synthesis of a germanosilicate zeolite HPM-12 using a short imidazolium-based dication: structure-direction by charge-to-charge distance matching

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Publication details

The article was received on 21 Oct 2019, accepted on 17 Nov 2019 and first published on 18 Nov 2019


Article type: Paper
DOI: 10.1039/C9DT04089G
Dalton Trans., 2019,48, 17752-17762
  • Open access: Creative Commons BY-NC license
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    Synthesis of a germanosilicate zeolite HPM-12 using a short imidazolium-based dication: structure-direction by charge-to-charge distance matching

    P. Lu, L. Gómez-Hortigüela, Z. Gao and M. A. Camblor, Dalton Trans., 2019, 48, 17752
    DOI: 10.1039/C9DT04089G

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