Cargando…

Revealing hydrogen atoms in a highly-absorbing material: an X-ray diffraction study and Torque method calculations for lead-uranyl-oxide mineral curite

The crystal structure of lead uranyl-oxide hydroxy-hydrate mineral curite, ideally Pb(3)(H(2)O)(2)[(UO(2))(4)O(4)(OH)(3)](2), was studied by means of single-crystal X-ray diffraction and theoretical calculations in order to localize positions of hydrogen atoms in the structure. This study has demons...

Descripción completa

Detalles Bibliográficos
Autores principales: Ghazisaeed, Seyedayat, Kiefer, Boris, Plášil, Jakub
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society of Chemistry 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9062394/
https://www.ncbi.nlm.nih.gov/pubmed/35520917
http://dx.doi.org/10.1039/c8ra09557d
_version_ 1784698931597279232
author Ghazisaeed, Seyedayat
Kiefer, Boris
Plášil, Jakub
author_facet Ghazisaeed, Seyedayat
Kiefer, Boris
Plášil, Jakub
author_sort Ghazisaeed, Seyedayat
collection PubMed
description The crystal structure of lead uranyl-oxide hydroxy-hydrate mineral curite, ideally Pb(3)(H(2)O)(2)[(UO(2))(4)O(4)(OH)(3)](2), was studied by means of single-crystal X-ray diffraction and theoretical calculations in order to localize positions of hydrogen atoms in the structure. This study has demonstrated that hydrogen atoms can be localized successfully also in materials for which the conventional approach of structure analysis failed, here due to very high absorption of X-rays by the mineral matrix. The theoretical calculations, based on the Torque method, provide a robust, fast real-space method for determining H(2)O orientations from their rotational equilibrium condition. In line with previous results we found that curite is orthorhombic, with space group Pnma, unit-cell parameters a = 12.5510(10), b = 8.3760(4), c = 13.0107(9) Å, V = 1367.78(16) Å(3), and two formula units per unit cell. The structure (R(1) = 3.58% for 1374 reflections with I > 3σI) contains uranyl-hydroxo-oxide sheets of the unique topology among uranyl oxide minerals and compounds and an interlayer space with Pb(2+) cations and a single H(2)O molecule, which is coordinated to the Pb-site. Current results show that curite is slightly non-stoichiometric in Pb content (∼3.02 Pb per unit cell, Z = 2); the charge-balance mechanism is via (OH) ↔ O(2) substitution within the sheets of uranyl polyhedra. Disproving earlier predictions, the current study shows that curite contains only one H(2)O group, with [4]-coordinated oxygen. The hydrogen bonding network maintains the bonding between the sheets in addition to Pb–O bonds; among them, a H-bond is crucial between the OH group on an apical O(Uranyl) atom of an adjacent sheet that stabilizes the entire structure. The results show that the combination of experimental X-ray data and the Torque method can successfully reveal hydrogen bonding especially for complex crystal structures and materials where X-rays fail to provide unambiguous hydrogen positions.
format Online
Article
Text
id pubmed-9062394
institution National Center for Biotechnology Information
language English
publishDate 2019
publisher The Royal Society of Chemistry
record_format MEDLINE/PubMed
spelling pubmed-90623942022-05-04 Revealing hydrogen atoms in a highly-absorbing material: an X-ray diffraction study and Torque method calculations for lead-uranyl-oxide mineral curite Ghazisaeed, Seyedayat Kiefer, Boris Plášil, Jakub RSC Adv Chemistry The crystal structure of lead uranyl-oxide hydroxy-hydrate mineral curite, ideally Pb(3)(H(2)O)(2)[(UO(2))(4)O(4)(OH)(3)](2), was studied by means of single-crystal X-ray diffraction and theoretical calculations in order to localize positions of hydrogen atoms in the structure. This study has demonstrated that hydrogen atoms can be localized successfully also in materials for which the conventional approach of structure analysis failed, here due to very high absorption of X-rays by the mineral matrix. The theoretical calculations, based on the Torque method, provide a robust, fast real-space method for determining H(2)O orientations from their rotational equilibrium condition. In line with previous results we found that curite is orthorhombic, with space group Pnma, unit-cell parameters a = 12.5510(10), b = 8.3760(4), c = 13.0107(9) Å, V = 1367.78(16) Å(3), and two formula units per unit cell. The structure (R(1) = 3.58% for 1374 reflections with I > 3σI) contains uranyl-hydroxo-oxide sheets of the unique topology among uranyl oxide minerals and compounds and an interlayer space with Pb(2+) cations and a single H(2)O molecule, which is coordinated to the Pb-site. Current results show that curite is slightly non-stoichiometric in Pb content (∼3.02 Pb per unit cell, Z = 2); the charge-balance mechanism is via (OH) ↔ O(2) substitution within the sheets of uranyl polyhedra. Disproving earlier predictions, the current study shows that curite contains only one H(2)O group, with [4]-coordinated oxygen. The hydrogen bonding network maintains the bonding between the sheets in addition to Pb–O bonds; among them, a H-bond is crucial between the OH group on an apical O(Uranyl) atom of an adjacent sheet that stabilizes the entire structure. The results show that the combination of experimental X-ray data and the Torque method can successfully reveal hydrogen bonding especially for complex crystal structures and materials where X-rays fail to provide unambiguous hydrogen positions. The Royal Society of Chemistry 2019-03-29 /pmc/articles/PMC9062394/ /pubmed/35520917 http://dx.doi.org/10.1039/c8ra09557d Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by-nc/3.0/
spellingShingle Chemistry
Ghazisaeed, Seyedayat
Kiefer, Boris
Plášil, Jakub
Revealing hydrogen atoms in a highly-absorbing material: an X-ray diffraction study and Torque method calculations for lead-uranyl-oxide mineral curite
title Revealing hydrogen atoms in a highly-absorbing material: an X-ray diffraction study and Torque method calculations for lead-uranyl-oxide mineral curite
title_full Revealing hydrogen atoms in a highly-absorbing material: an X-ray diffraction study and Torque method calculations for lead-uranyl-oxide mineral curite
title_fullStr Revealing hydrogen atoms in a highly-absorbing material: an X-ray diffraction study and Torque method calculations for lead-uranyl-oxide mineral curite
title_full_unstemmed Revealing hydrogen atoms in a highly-absorbing material: an X-ray diffraction study and Torque method calculations for lead-uranyl-oxide mineral curite
title_short Revealing hydrogen atoms in a highly-absorbing material: an X-ray diffraction study and Torque method calculations for lead-uranyl-oxide mineral curite
title_sort revealing hydrogen atoms in a highly-absorbing material: an x-ray diffraction study and torque method calculations for lead-uranyl-oxide mineral curite
topic Chemistry
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9062394/
https://www.ncbi.nlm.nih.gov/pubmed/35520917
http://dx.doi.org/10.1039/c8ra09557d
work_keys_str_mv AT ghazisaeedseyedayat revealinghydrogenatomsinahighlyabsorbingmaterialanxraydiffractionstudyandtorquemethodcalculationsforleaduranyloxidemineralcurite
AT kieferboris revealinghydrogenatomsinahighlyabsorbingmaterialanxraydiffractionstudyandtorquemethodcalculationsforleaduranyloxidemineralcurite
AT plasiljakub revealinghydrogenatomsinahighlyabsorbingmaterialanxraydiffractionstudyandtorquemethodcalculationsforleaduranyloxidemineralcurite