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Issue 61, 2018, Issue in Progress
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Does the compound hexaaqua-zinc(II)bis(hydrogensulfate)dihydrate, [Zn(H2O)6](HSO4·H2O)2, really exist?

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Abstract

A careful examination of the crystal structure of the hydrogensulfate compound [Zn(H2O)6](HSO4·H2O)2 reported in this journal shows that the sample used for X-ray diffraction was almost certainly the Tutton salt [Zn(H2O)6](SO4·NH4)2, isoelectronic with the former elusive compound (F000 = 416, P21/c space group). Indeed, any chemistry involving ammonium and sulfate moieties in an aqueous medium containing a transition metal cation should afford the corresponding Tutton salt as a by-product. We redetermined the structure of [Zn(H2O)6](SO4·NH4)2, on the basis of high-resolution X-ray data (d = 0.47 Å), with the purpose of illustrating that at such resolution, difference Fourier maps may be used to unambiguously differentiate between a sulfate and a hydrogensulfate ion. On the other hand, regardless of the data resolution, geometrical considerations may be enough to avoid misassignment of such small ions in crystal structures, providing that some knowledge about the average shape of these ions is available from curated crystallographic databases.

Graphical abstract: Does the compound hexaaqua-zinc(ii)bis(hydrogensulfate)dihydrate, [Zn(H2O)6](HSO4·H2O)2, really exist?

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Publication details

The article was received on 15 Jun 2018, accepted on 02 Oct 2018 and first published on 12 Oct 2018


Article type: Paper
DOI: 10.1039/C8RA05162C
Citation: RSC Adv., 2018,8, 34921-34925
  • Open access: Creative Commons BY-NC license
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    Does the compound hexaaqua-zinc(II)bis(hydrogensulfate)dihydrate, [Zn(H2O)6](HSO4·H2O)2, really exist?

    A. Pérez-Benítez and S. Bernès, RSC Adv., 2018, 8, 34921
    DOI: 10.1039/C8RA05162C

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