Acknowledgements We thank the EPSRC National Crystallography Service (University of Southampton) for the X-ray data collection.Peer reviewedPublisher PD

Harrison, W. T. A.

Plater, M. J.

Acta Crystallographica Section E Structure Reports Online

English

PubMed

The title compound, NaK5Cl2(S2O6)2 [systematic name: sodium pentapotassium dichloride bis(dithionate)], arose as an unexpected product from an organic synthesis that used dithionite (S2O42−) ions as a reducing agent to destroy excess permanganate ions. Compared to the previous study [Stanley (1953). Acta Cryst. 6, 187–196], the present tetragonal structure exhibits a root 2a × root 2a × c super-cell due to subtle changes in the orientations of the dithionate anions. The structure can be visualized as a three-dimensional framework of [001] columns of alternating trans-NaO4Cl2 and KO4Cl2 octahedra cross-linked by the dithionate ions with the interstices occupied by KO6Cl2 polyhedra to generate a densely packed three-dimensional framework. The asymmetric unit comprises two sodium ions (site symmetries 4 and -4, four potassium ions (site symmetries = -4, 4, 1 and 1), three chloride ions (site symmetries = 4, 4 and 2) and two half-dithionate ions (all atoms on general positions). Both dithionate ions are completed by crystallographic inversion symmetry. The crystal chosen for data collection was found to be rotationally twinned by 180° about the [100] axis in reciprocal space with a 0.6298 (13):0.3702 (13) domain ratio

William T. A. Harrison

M. John Plater

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Acta Crystallographica Section E Crystallographic Communications

An unexpected oxidation: NaK5Cl2(S2O6)2 revisited

The title compound, NaK5Cl2(S2O6)2[systematic name: sodium pentapotassium dichloride bis(dithionate)], arose as an unexpected product from an organic synthesis that used dithionite (S2O42−) ions as a reducing agent to destroy excess permanganate ions. Compared to the previous study [Stanley (1953).Acta Cryst.6, 187–196], the present tetragonal structure exhibits a root 2a× root 2a×csuper-cell due to subtle changes in the orientations of the dithionate anions. The structure can be visualized as a three-dimensional framework of [001] columns of alternatingtrans-NaO4Cl2and KO4Cl2octahedra cross-linked by the dithionate ions with the interstices occupied by KO6Cl2polyhedra to generate a densely packed three-dimensional framework. The asymmetric unit comprises two sodium ions (site symmetries 4 and -4, four potassium ions (site symmetries = -4, 4, 1 and 1), three chloride ions (site symmetries = 4, 4 and 2) and two half-dithionate ions (all atoms on general positions). Both dithionate ions are completed by crystallographic inversion symmetry. The crystal chosen for data collection was found to be rotationally twinned by 180° about the [100] axis in reciprocal space with a 0.6298 (13):0.3702 (13) domain ratio.</jats:p

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An unexpected oxidation: NaK5Cl2(S2O6)2revisited

Acknowledgements We thank the EPSRC National Crystallography Service (University of Southampton) for the X-ray data collection.Peer reviewe

Aberdeen University Research

An unexpected oxidation : NaK5Cl2(S2O6)2 revisited

http://dx.doi.org/10.1107/S2056989017000494

An unexpected oxidation : NaK5Cl2(S2O6)2 revisited

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Aberdeen University Research