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Crystal structure of potassium sodium hepta-hydrogen hexa-molybdocobaltate(III) octa-hydrate: an extra-protonated B-series Anderson-type heteropolyoxidometalate.

Park KM, Joo HC, Lee U - Acta Crystallogr E Crystallogr Commun (2015)

Bottom Line: The title compound, KNa[Co(III)(OH)7{Mo6O17}]·8H2O, was obtained by the ion-exchange technique from K3[Co(μ3-OH)6Mo6O18]·7H2O.Six μ3-O atoms and one O atom of the bridging μ2-O atom are protonated.This novel polyanion protonated by an extra H atom is an unexpected polyanion species among the B-series Anderson-type polyoxidometalates (POMs), [X(n) (+)(μ3-OH)6Mo6O18]((6-n)-)] (X = heteroatom).

View Article: PubMed Central - HTML - PubMed

Affiliation: Research Institute of Natural Science, Gyeongsang National University, 501 Jinju-daero, Jinju, 660-701, Republic of Korea.

ABSTRACT
The title compound, KNa[Co(III)(OH)7{Mo6O17}]·8H2O, was obtained by the ion-exchange technique from K3[Co(μ3-OH)6Mo6O18]·7H2O. Six μ3-O atoms and one O atom of the bridging μ2-O atom are protonated. This novel polyanion protonated by an extra H atom is an unexpected polyanion species among the B-series Anderson-type polyoxidometalates (POMs), [X(n) (+)(μ3-OH)6Mo6O18]((6-n)-)] (X = heteroatom). The extra H atom (seventh H atom) in the polyanion does not lie on a crystallographic centre of symmetry, but is located at the mid-point between two μ2-O atoms of adjacent polyanions, and forms a very short hydrogen bond [2.430 (5) Å]. The present structure is considered as particularly significant in understanding noncentrosymmetric strong hydrogen bonding.

No MeSH data available.


The polyanion structure and the cations as well as the lattice water molecules in the title compound. Displacement ellipsoids are drawn at the 50% probability level for non-H atoms. H atoms are drawn as small spheres of arbitrary radius.
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fig1: The polyanion structure and the cations as well as the lattice water molecules in the title compound. Displacement ellipsoids are drawn at the 50% probability level for non-H atoms. H atoms are drawn as small spheres of arbitrary radius.

Mentions: Fig. 1 ▸ shows the the components of the crystal structure of the title compound. The O atoms of the heteropolyanion have been designated as OT (terminal Mo=O atom), OB (bridging μ2-OB atom; Mo—O—Mo), and OC (centred μ3-O atom; Mo2—OC—Co). The protonated O atoms in the polyanion were confirmed by the BVSs, the charge balance, the bond-length elongation and the inter­polyanion hydrogen bonds (Fig. 3 ▸ and Table 1 ▸).


Crystal structure of potassium sodium hepta-hydrogen hexa-molybdocobaltate(III) octa-hydrate: an extra-protonated B-series Anderson-type heteropolyoxidometalate.

Park KM, Joo HC, Lee U - Acta Crystallogr E Crystallogr Commun (2015)

The polyanion structure and the cations as well as the lattice water molecules in the title compound. Displacement ellipsoids are drawn at the 50% probability level for non-H atoms. H atoms are drawn as small spheres of arbitrary radius.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4555401&req=5

fig1: The polyanion structure and the cations as well as the lattice water molecules in the title compound. Displacement ellipsoids are drawn at the 50% probability level for non-H atoms. H atoms are drawn as small spheres of arbitrary radius.
Mentions: Fig. 1 ▸ shows the the components of the crystal structure of the title compound. The O atoms of the heteropolyanion have been designated as OT (terminal Mo=O atom), OB (bridging μ2-OB atom; Mo—O—Mo), and OC (centred μ3-O atom; Mo2—OC—Co). The protonated O atoms in the polyanion were confirmed by the BVSs, the charge balance, the bond-length elongation and the inter­polyanion hydrogen bonds (Fig. 3 ▸ and Table 1 ▸).

Bottom Line: The title compound, KNa[Co(III)(OH)7{Mo6O17}]·8H2O, was obtained by the ion-exchange technique from K3[Co(μ3-OH)6Mo6O18]·7H2O.Six μ3-O atoms and one O atom of the bridging μ2-O atom are protonated.This novel polyanion protonated by an extra H atom is an unexpected polyanion species among the B-series Anderson-type polyoxidometalates (POMs), [X(n) (+)(μ3-OH)6Mo6O18]((6-n)-)] (X = heteroatom).

View Article: PubMed Central - HTML - PubMed

Affiliation: Research Institute of Natural Science, Gyeongsang National University, 501 Jinju-daero, Jinju, 660-701, Republic of Korea.

ABSTRACT
The title compound, KNa[Co(III)(OH)7{Mo6O17}]·8H2O, was obtained by the ion-exchange technique from K3[Co(μ3-OH)6Mo6O18]·7H2O. Six μ3-O atoms and one O atom of the bridging μ2-O atom are protonated. This novel polyanion protonated by an extra H atom is an unexpected polyanion species among the B-series Anderson-type polyoxidometalates (POMs), [X(n) (+)(μ3-OH)6Mo6O18]((6-n)-)] (X = heteroatom). The extra H atom (seventh H atom) in the polyanion does not lie on a crystallographic centre of symmetry, but is located at the mid-point between two μ2-O atoms of adjacent polyanions, and forms a very short hydrogen bond [2.430 (5) Å]. The present structure is considered as particularly significant in understanding noncentrosymmetric strong hydrogen bonding.

No MeSH data available.