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Hydroxylammonium fluorometalate: synthesis and characterisation of a new fluorozincate

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Abstract

A new coordination compound of zinc fluoride and hydroxylammonium, (NH3OH)2ZnF4, was obtained after dissolving zinc powder in hydrofluoric acid (40%) and adding solid hydroxylammonium fluoride. The colourless crystals were characterised chemically, magnetically, structurally by single-crystal X-ray diffraction analysis, and thermogravimetrically by TGA and DSC analysis. The structure consists of NH3OH+ cations and ZnF6 octahedra in which the metal ion lies on the inversion centre. Each of the ZnF6 octahedra shares four of its vertices in a way that each vertex is shared between two octahedra. Oxygen and nitrogen atoms of hydroxylammonium cations are donors of hydrogen bonds. Hydroxylamonium fluorozincate crystallizes monoclinic, P21/c, with cell parameters a = 8.1604(4) Å, b = 5.8406(3) Å, c = 5.6586(2) Å and β = 94.745(3)°. The compound decomposes above 373 K in four steps, obtaining ZnO as the final residue. Magnetic properties of the compound were studied between 2 and 300 K, giving the prevailing diamagnetic behaviour with room temperature susceptibility of −9 × 10−5 emu mol−1.

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Acknowledgments

The authors thank the Ministry of Higher Education, Science and Technology of the Republic of Slovenia for their support.

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Correspondence to Brina Dojer.

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Dojer, B., Golobič, A., Jagličić, Z. et al. Hydroxylammonium fluorometalate: synthesis and characterisation of a new fluorozincate. Monatsh Chem 143, 175–180 (2012). https://doi.org/10.1007/s00706-011-0667-3

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  • DOI: https://doi.org/10.1007/s00706-011-0667-3

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