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Published in

International Union of Crystallography, Acta Crystallographica Section E: Crystallographic Communications, 7(76), p. 1136-1138, 2020

DOI: 10.1107/s2056989020008099

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Crystal structure of posnjakite formed in the first crystal water-cooling line of the ANSTO Melbourne Australian Synchrotron MX1 Double Crystal Monochromator

Journal article published in 2020 by Stuart Mills, Jun Aishima, David Aragao, Tom Tudor Caradoc-Davies ORCID, Nathan Cowieson ORCID, Christine L. Gee, Daniel Ericsson ORCID, Stephen Harrop, Santosh Panjikar ORCID, Kate Mary Louise Smith, Alan Riboldi-Tunnicliffe ORCID, Rachel Williamson, Jason Roy Price ORCID
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

Exceptionally large crystals of posnjakite, Cu4SO4(OH)6(H2O), formed during corrosion of a Swagelock(tm) Snubber copper gasket within the MX1 beamline at the ANSTO-Melbourne, Australian Synchrotron. The crystal structure was solved using synchrotron radiation toR1= 0.029 and revealed a structure based upon [Cu4(OH)6(H2O)O] sheets, which contain Jahn–Teller-distorted Cu octahedra. The sulfate tetrahedra are bonded to one side of the sheetviacorner sharing and linked to successive sheetsviaextensive hydrogen bonds. The sulfate tetrahedra are split and rotated, which enables additional hydrogen bonds.