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Crystals 2018, 8(2), 17; https://doi.org/10.3390/cryst8020017

Two Supramolecular Inorganic–Organic Hybrid Crystals Based on Keggin Polyoxometalates and Crown Ethers

1
College of Chemistry and Chemical Engineering, Wuhan Textile University, Wuhan 430200, China
2
Graduate School of Environmental Science, Hokkaido University, Sapporo 060-0812, Japan
3
Research Institute for Electronic Science, Hokkaido University, Sapporo 001-0020, Japan
*
Authors to whom correspondence should be addressed.
Received: 13 December 2017 / Revised: 18 January 2018 / Accepted: 19 January 2018 / Published: 23 January 2018
(This article belongs to the Special Issue Crystal Structure Analysis of Supramolecular and Porous Solids)
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Abstract

New supramolecular structures were designed in this work using large-sized polyoxometalates (POMs) and crown-ether-based supramolecular cations selected as building blocks. Two novel supramolecular inorganic–organic hybrids [(3-F-4-MeAnis)([18]crown-6)]2[SMo12O40]•CH3CN (1) and [(4-IAnis)([18]crown-6)]3[PMo12O40]•4CH3CN (2) (3-F-4-MeAnis = 3-fluoro-4-methylanilinium and 4-IAnis = 4-iodoanilinium) were synthesized. Crystals 1 and 2 have been characterized by infrared spectroscopy (IR) and elemental analysis (EA). Based on X-ray diffraction analysis, Crystals 1 and 2 were constructed through noncovalent bonding interactions and belong to different space groups due to the difference of the building blocks used. Supramolecular cations formed due to strong N–H···O hydrogen bonding interactions between the six oxygen atoms of [18]crown-6 molecules and nitrogen atoms of anilinium derivatives. Crystal 1 has two different supramolecular cations with an anti-paralleled arrangement that forms a dimer through weak hydrogen bonding interactions between adjacent [18]crown-6 molecules. Crystal 2 has three independent supramolecular cations that fill large spaces between the [PMo12O40] polyoxoanions forming a rhombus-shape packing arrangement in the ac plane. Crystals 1 and 2 are unstable at room temperature. View Full-Text
Keywords: supramolecular chemistry; inorganic–organic hybrids; polyoxometalates; crown ethers supramolecular chemistry; inorganic–organic hybrids; polyoxometalates; crown ethers
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Xiong, J.; Luo, T.; Zhang, J.; Li, X.-X.; Lv, S.-F.; Peng, J.-J.; Li, M.; Li, W.; Nakamura, T. Two Supramolecular Inorganic–Organic Hybrid Crystals Based on Keggin Polyoxometalates and Crown Ethers. Crystals 2018, 8, 17.

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