Crystal structure of K0.75[FeII3.75FeIII1.25(HPO3)6]·0.5H2O, an open-framework iron phosphite with mixed-valent FeII/FeIII ions
| Autor: | Edurne S. Larrea, José Luis Mesa, Estibaliz Legarra, Andrés Tomás Aguayo, Maria Isabel Arriortua |
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| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: | |
| Zdroj: | Acta Crystallographica Section E: Crystallographic Communications, Vol 72, Iss 1, Pp 63-65 (2016) |
| Druh dokumentu: | article |
| ISSN: | 2056-9890 20569890 |
| DOI: | 10.1107/S2056989015024007 |
| Popis: | Single crystals of the title compound, potassium hexaphosphitopentaferrate(II,III) hemihydrate, K0.75[FeII3.75FeIII1.25(HPO3)6]·0.5H2O, were grown under mild hydrothermal conditions. The crystal structure is isotypic with Li1.43[FeII4.43FeIII0.57(HPO3)6]·1.5H2O and (NH4)2[FeII5(HPO3)6] and exhibits a [FeII3.75FeIII1.25(HPO3)6]0.75− open framework with disordered K+ (occupancy 3/4) as counter-cations. The anionic framework is based on (001) sheets of two [FeO6] octahedra (one with point group symmetry 3.. and one with point group symmetry .2.) linked along [001] through [HPO3]2− oxoanions. Each sheet is constructed from 12-membered rings of edge-sharing [FeO6] octahedra, giving rise to channels with a radius of ca 3.1 Å where the K+ cations and likewise disordered water molecules (occupancy 1/4) are located. O...O contacts between the water molecule and framework O atoms of 2.864 (5) Å indicate hydrogen-bonding interactions of medium strength. The infrared spectrum of the compound shows vibrational bands typical for phosphite and water groups. The Mössbauer spectrum is in accordance with the presence of FeII and FeIII ions. |
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