Crystal structure of an organic–inorganic supramolecular salt based on a 4,4′-methylenebis(3,5-dimethyl-1<i>H</i>-pyrazol-2-ium) cation and a β-octamolybdate anion

Organic–inorganic hybrids consisting of organic cations and polyanions are promising functional materials due to their various compositions and structures. An important aspect of these materials is the interactions between the organic and inorganic components, which not only produce the final structures, but also influence the properties. Here, we investigated the interactions between organic cations and polyanions using protonated 2‐aminopyridinium (Hap) as the cation, and successfully obtained two polyoxometalate‐based hybrids, namely (C5H7N2)4[Mo8O26], (I), and (C5H7N2)2[NiMo6O16(OH)2{CH3C(CH2O)3}2]·4H2O, (II). In the crystal structure of (I), every Hap cation links with two polyanions by donating one or two N—H…O hydrogen bonds, and every polyanion is surrounded by eight Hap cations via terminal or bridging O atoms. Conversely, in compound (II), every Hap cation only links with one polyanion decorated by a triol ligand; this organic–inorganic component further assembles via uncoordinated water molecules. In the extended structures, Hap plays a key role, not only providing a counter charge, but also acting as `glue' linking polyanions in the role of hydrogen‐bond donors. In both compounds, as the nodes of the supramolecular network, the polyanions exhibit an ordered two‐dimensional arrangement due to strong hydrogen bonds and electrostatic interactions between the organic and inorganic parts. The electrochemistry of compound (I) shows that redox sourcing from polyanions is a surface‐controlled process. Conversely, the magnetic behaviour of compound (II) indicates dominant antiferromagnetic properties.

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Supramolecular interaction-induced assemblies of polyanions and 2-aminopyridinium in two polyoxometalate-based hybrids

Duan

Liu

et al. 2018

Acta Crystallogr C

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Crystal structure of an organic–inorganic supramolecular salt based on a 4,4′-methylenebis(3,5-dimethyl-1H-pyrazol-2-ium) cation and a β-octamolybdate anion

Abstract: The crystal structure of the title novel organic–inorganic supramolecular salt is based in the in situ formation of 4,4′-methylenebis(3,5-dimethyl-1H-pyrazol-2-ium) cations, which are engaged in N—H⋯O hydrogen bonds with β-octamolybdate anions.

Cited by 1 publication

References 15 publications

Supramolecular interaction-induced assemblies of polyanions and 2-aminopyridinium in two polyoxometalate-based hybrids

Supramolecular interaction-induced assemblies of polyanions and 2-aminopyridinium in two polyoxometalate-based hybrids

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Crystal structure of an organic–inorganic supramolecular salt based on a 4,4′-methylenebis(3,5-dimethyl-1H-pyrazol-2-ium) cation and a β-octamolybdate anion

Abstract: The crystal structure of the title novel organic–inorganic supra­molecular salt is based in the in situ formation of 4,4′-methyl­enebis(3,5-dimethyl-1H-pyrazol-2-ium) cations, which are engaged in N—H⋯O hydrogen bonds with β-octa­molybdate anions.

Cited by 1 publication

References 15 publications

Supramolecular interaction-induced assemblies of polyanions and 2-aminopyridinium in two polyoxometalate-based hybrids

Supramolecular interaction-induced assemblies of polyanions and 2-aminopyridinium in two polyoxometalate-based hybrids

Contact Info

Product

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About

Abstract: The crystal structure of the title novel organic–inorganic supramolecular salt is based in the in situ formation of 4,4′-methylenebis(3,5-dimethyl-1H-pyrazol-2-ium) cations, which are engaged in N—H⋯O hydrogen bonds with β-octamolybdate anions.