Lead Oxychloride Borates Obtained under Extreme Conditions

Siidra, O. I., Kabbour, H., Mentre, O., Nazarchuk, E. V., Kegler, P., Zinyakhina, D. O., Colmont, M. and Depmeier, Wulf (2016) Lead Oxychloride Borates Obtained under Extreme Conditions Inorganic Chemistry, 55 (17). pp. 9077-9084. DOI 10.1021/acs.inorgchem.6b01587.

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Abstract

[Pb10O4]Pb-2(B2O5)Cl-12 (1) and [Pb18O12]Pb(BO2OH)(2)Cl-10 (2) were obtained via high-temperature high-pressure experiments. [O12Pb18](12+) and [O4Pb10](12)+ oxocentered structural units of different dimensionality are excised from the ideal [OPb] layer in tetragonal alpha-PbO. 2 is formed with an excess of lead oxide component, and 1 is formed with an excess of borate and halide reagents. The structure of 2 can be visualized as the incorporation of {Pb(10)Cl-4(BO2OH)(2)} clusters into alternating PbO and chloride layers, with the existence of square vacancies in both. However, the structure of 1 is described as the intrusion of [O4Pb10](12+) tetramers linked by disordered Pb(B2O5) groups into a halogen three-dimensional matrix. The structure of 2 contains 10 symmetrically independent Pb positions. The 6s(2) lone electron pair is stereochemically active on Pb(1)Pb(9) atoms, whereas it is inert on Pb(10). All of the Pb coordinations in the structure of 2, in accordance with ECCv (volume eccentricity) parameters and the density of states (DOS), can be subdivided into three groups. The current study is the first attempt to analyze this unusual behavior in structurally complex oxyhalide material with the rare case of Pb2+ cations, demonstrating both stereochemically active and inactive behavior of the lone pair via charge and first-principle calculations.

Document Type: Article
Additional Information: Times Cited: 0 Siidra, Oleg I. Kabbour, Houria Mentre, Olivier Nazarchuk, Evgeny V. Kegler, Philip Zinyakhina, Diana O. Colmont, Marie Depmeier, Wulf
Research affiliation: OceanRep > The Future Ocean - Cluster of Excellence
Kiel University
Refereed: Yes
DOI etc.: 10.1021/acs.inorgchem.6b01587
ISSN: 0020-1669
Projects: Future Ocean
Date Deposited: 12 Mar 2017 09:27
Last Modified: 19 Dec 2017 12:43
URI: http://eprints.uni-kiel.de/id/eprint/36321

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