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Issue 29, 2013
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Formation of zeolite-like zinc 1,3,5-benzenetriphosphonate open-frameworks by topotactic pillaring of anionic layers

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Abstract

An ab initio powder X-ray crystal structure analysis revealed that layered zinc 1,3,5-benzenetriphosphonates containing interlayer tetramethylammonium (ZBP–TMA) or 4,4′-bipyridinium cations (ZBP–bpy) are transformed to novel isomorphous 3D open-framework compounds ZBP–M (M: K, Rb, and Cs) by treatment in aqueous alkali metal chloride solutions. ZBP–Ms have a pillared layer-type of anionic framework containing 2D zigzag channels connected with cage-like spaces. The potassium atoms in ZBP–K are located near 8MR windows in the 2D zigzag channels, and the potassium cations are successfully exchanged with ammonium cations retaining the open-framework structure. The ammonium form (ZBP–NH4) showed remarkable cation exchange selectivity for Rb+ and Cs+ in a mixture of alkali metal cations. It is assumed that zinc ions partially dissolved from the starting layered ZBP precursors are intercalated in ZBP layers to form pillared layered 3D open-frameworks. These results clearly show that topotactic pillared layer approaches are applicable not only to zeolite-related materials but also to novel open-framework metal organophosphonates.

Graphical abstract: Formation of zeolite-like zinc 1,3,5-benzenetriphosphonate open-frameworks by topotactic pillaring of anionic layers

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Publication details

The article was received on 19 Dec 2012, accepted on 22 Feb 2013 and first published on 22 Feb 2013


Article type: Paper
DOI: 10.1039/C3DT33037K
Dalton Trans., 2013,42, 10424-10432

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    Formation of zeolite-like zinc 1,3,5-benzenetriphosphonate open-frameworks by topotactic pillaring of anionic layers

    K. Maeda, R. Takamatsu, M. Mochizuki, K. Kawawa and A. Kondo, Dalton Trans., 2013, 42, 10424
    DOI: 10.1039/C3DT33037K

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