Crystal structure of hexa-kis-(di-methyl-formamide-κO)manganese(II) deca-kis-(di-methyl-formamide)-1κ(5) O,2κ(5) O-[μ-octa-deca-tungstodiphosphato(V)-κO:κO']dimanganate(II) di-methyl-formamide disolvate.

Fatma Dhifallah,Mohamed Salah Belkhiria

doi:10.1107/s2056989016007842

Fatma Dhifallah, Mohamed Salah Belkhiria

Open Access

https://doi.org/10.1107/s2056989016007842

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Abstract

The crystal structure of the title compound, [Mn(C3H7NO)6][{Mn(C3H7NO)5}2(μ-P2W18O62)]·2C3H7NO, reveals that the Wells-Dawson-type polyanion [P2W18O62](6-), through terminal O atoms from the belts, bridges two Mn(II) octa-hedral complexes. In the complex anion [{Mn(dmf)5}2(μ-P2W18O62)](2-), located around a twofold rotation axis, the Mn(II) ions are coordinated by five O atoms from di-methyl-formamide (dmf) ligands and to a terminal O atom from the [P2W18O62](6-) polyanion. Another Mn(II) ion, located on an inversion centre, is coordinated by six O atoms from the dmf ligands and forms the [Mn(dmf)6](2+) cation. The crystal components are connected through numerous weak C-H⋯O hydrogen bonds to construct a three-dimensional network.

Highlights

The crystal structure of the title compound, [Mn(C3H7NO)6][{Mn(C3H7NO)5}2(-P2W18O62)]2C3H7NO, reveals that the Wells–Dawson-type polyanion [P2W18O62]6, through terminal O atoms from the belts, bridges two MnII octahedral complexes
Wells–Dawson-type polyanion [P2W18O62]6 acting as a bridging ligand between the two MnII atoms, is located about a twofold symmetry axis (Fig. 1)
The Mn1 ion within this anion is coordinated by five dmf molecules through O atoms and by a terminal O atom from the belt of the Wells–Dawson-type polyanion

Summary

Chemical context

Over the past few decades, polyoxidometalates (POMs) have been considered to be interesting building blocks for the construction of organic–inorganic hybrid materials because of their nanosize, abundant topologies, controllable shapes and high negative charges (Dolbecq et al, 2010). As a result of their unique redox, catalytic, photochemical and magnetic properties, organic–inorganic hybrid POM–based materials have captured considerable attention and are applied widely in many fields such as material science, catalysis and medicine (Niu et al, 2004; Ben Khelifa et al, 2015). We report the synthesis, crystal structure and supramolecular architecture of the title compound, (1). The molecular structure of the anion [{Mn(DMF)5}2(-P2W18O62)]2 in (1). Displacement ellipsoids are drawn at the 30% probability level. H atoms have been omitted for clarity. H atoms have been omitted for clarity. [Symmetry code (i) x + 1, y, z + 12.]

Structural commentary

Synthesis and crystallization

FT–IR Spectroscopy

Refinement