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Crystal structure of a new variety of lead dodecaborate Pb 6 (Li 0.65 Na 0.19 )[B 12 O 24 ]I 0.84 · 0.168H 2 O and its comparison with beryl and cordierite

Crystal structure of a new variety of lead dodecaborate Pb 6 (Li 0.65 Na 0.19 )[B 12 O 24 ]I 0.84... Abstract Crystals of a new representative of ring-radical dodecaborates Pb6(Li0.65Na0.19)[B12O24]I0.84 · 0.168H2O, space group \(R\bar 3m\), are obtained under hydrothermal conditions. The structure is determined with-out preliminary knowledge of the chemical formula. It is close to that of the Pb6[B12O24] · H2O dodecaborate studied earlier, but unlike the latter structure it contains admixtures of iodide anion, lithium cation, and water molecule, which incompletely populate positions in channels. The formation of the second variety, which brings to light ion-exchange properties of the crystals, is due to mineralizing ions available in the concen-trated solution in the course of crystallization. The new compound is compared with beryl and cordierite, which have close structures with channels capable of capturing various groups. Structures of synthetic Na and Ag dodecaborates with analogous but distorted ring dodecaborate radicals are discussed. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Crystallography Reports Springer Journals

Crystal structure of a new variety of lead dodecaborate Pb 6 (Li 0.65 Na 0.19 )[B 12 O 24 ]I 0.84 · 0.168H 2 O and its comparison with beryl and cordierite

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References (5)

Publisher
Springer Journals
Copyright
2013 Pleiades Publishing, Ltd.
ISSN
1063-7745
eISSN
1562-689X
DOI
10.1134/s1063774513030048
Publisher site
See Article on Publisher Site

Abstract

Abstract Crystals of a new representative of ring-radical dodecaborates Pb6(Li0.65Na0.19)[B12O24]I0.84 · 0.168H2O, space group \(R\bar 3m\), are obtained under hydrothermal conditions. The structure is determined with-out preliminary knowledge of the chemical formula. It is close to that of the Pb6[B12O24] · H2O dodecaborate studied earlier, but unlike the latter structure it contains admixtures of iodide anion, lithium cation, and water molecule, which incompletely populate positions in channels. The formation of the second variety, which brings to light ion-exchange properties of the crystals, is due to mineralizing ions available in the concen-trated solution in the course of crystallization. The new compound is compared with beryl and cordierite, which have close structures with channels capable of capturing various groups. Structures of synthetic Na and Ag dodecaborates with analogous but distorted ring dodecaborate radicals are discussed.

Journal

Crystallography Reports – Springer Journals

Published: May 1, 2013

Keywords: Crystallography and Scattering Methods

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