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Hydrogen bonding in lead uranyl oxide mineral sayrite

  • Jakub Plášil EMAIL logo
Published/Copyright: September 19, 2019

Abstract

The hydrogen bonding in the structure of the lead uranyl-oxide mineral sayrite has been refined and described directly from XRD data for the first time. Sayrite is monoclinic, a = 10.6925(4), b = 6.9593(2), c = 13.6035(5) Å, β = 107.680(3), with V = 964.46(6) Å3, and Z = 2, space group P 21/n. The structure has been refined to an R = 2.34% based on 2252 unique [I > 3σI] reflections. Sayrite possesses a layered structure with the uranyl-hydroxo-oxide sheets of the topology characterized by the topology symbol P4(UD)8R5. Between adjacent sheets, there are Pb2+ cations and molecular H2O. All H2O groups in sayrite belong to non-transformer groups, which distribute bond-valence from equally from all the cationic parts of the structure to anions. The structural formula of sayrite is Pb2(H2[4]O)4[(UO2)5O6(OH)2].

Acknowledgements

Dr. Florias Mees (The Royal Museum for Central Africa, Tervuren, Belgium) is acknowledged for providing access to sayrite stored in the museum’s collections. Eddy Van Der Meersche (Gent, Belgium) is thanked for mineral microphotography. Anthony Kampf and an anonymous reviewer, as well as the handling editor, are thanked for their constructive comments. This research was supported by project No. LO1603 under the Ministry of Education, Youth and Sports National sustainability program I of the Czech Republic.

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Received: 2019-06-18
Accepted: 2019-08-12
Published Online: 2019-09-19
Published in Print: 2019-12-18

©2019 Walter de Gruyter GmbH, Berlin/Boston

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