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Issue 40, 2012
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Co-templating ionothermal synthesis and structure characterization of two new 2D layered aluminophosphates

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Abstract

For the first time, the co-templating ionothermal methodology was used in the preparation of layered aluminophosphate materials. With the addition of either 1,2-ethylenediamine or 1,6-hexanediamine to the ionic liquid 1-ethyl-3-methyl imidazolium chloride, two new 2D layered aluminophosphates RUB-A1 [Al3P4O16][NH3CH2CH2NH3]0.5[C6N2H11]2 and RUB-A2 [Al3P4O16][NH3(CH2)6NH3][NH3(CH2)6NH2]0.5[C6N2H11]0.5[H2O] have been synthesized ionothermally by co-templating. The structure of RUB-A1 has been determined from single-crystal X-ray diffraction data using direct methods, while the structure of RUB-A2 has been solved ab initio from powder X-ray diffraction data with limited resolution using direct-space methods. Both of these two compounds have a 2D layered structure consisting of macroanionic sheets of composition [Al3P4O16]3− stacked in an AAAA sequence. The inorganic layers are built up from alternatively vertex-sharing [AlO4]- and [PO3([double bond, length as m-dash]O)]-tetrahedral units forming a 4.6.8 and a 4.6.12 network for RUB-A1 and RUB-A2, respectively. The layer topology of RUB-A1 is closely related to the previously known 4.6.8-layer topology but with a different sequence of phosphoryl group orientation. Combining the results of structure analysis with the NMR, chemical analysis and TG-DTA experiments, we show that both the ionic liquid cation and the protonated diamines are located in the interlayer space and together direct the formation of these two structures.

Graphical abstract: Co-templating ionothermal synthesis and structure characterization of two new 2D layered aluminophosphates

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Publication details

The article was received on 28 May 2012, accepted on 12 Aug 2012 and first published on 14 Aug 2012


Article type: Paper
DOI: 10.1039/C2DT31150J
Citation: Dalton Trans., 2012,41, 12408-12415
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    Co-templating ionothermal synthesis and structure characterization of two new 2D layered aluminophosphates

    Y. Wei, B. Marler, L. Zhang, Z. Tian, H. Graetsch and H. Gies, Dalton Trans., 2012, 41, 12408
    DOI: 10.1039/C2DT31150J

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