Polinski, Matthew J., Wang, Shuao, Alekseev, Evgeny V., Cross, Justin N., Depmeier, Wulf and Albrecht-Schmitt, Thomas E. (2012) Effect of pH and Reaction Time on the Structures of Early Lanthanide(III) Borate Perchlorates. Inorganic Chemistry, 51 (21). pp. 11541-11548. DOI 10.1021/ic301421e.

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Abstract

Reactions of LnCl3·6H2O (Ln = La–Nd, Sm, Eu), concentrated (11 M) perchloric acid, and molten boric acid result in the formation of four different compounds. These compounds are Ln[B8O10(OH)6(H2O)(ClO4)]·0.5H2O (Ln = La–Nd, Sm), Pr[B8O11(OH)4(H2O)(ClO4)], Ln[B7O11(OH)(H2O)2(ClO4)] (Ln = Pr, Nd, Sm, and Eu), and Ce[B8O11(OH)4(H2O)(ClO4)]. All Ln(III) cations are ten-coordinate with a capped triangular cupola geometry and contain an inner-sphere, monodentate perchlorate moiety. This geometry is obtained because of the coordination of the oxygen donors within the polyborate sheet which create triangular holes and provide residence for the lanthanide metal centers. Aside from Ln[B8O10(OH)6(H2O)(ClO4)]·0.5H2O (Ln = La–Nd, Sm), which are two-dimensional sheet structures, all other compounds are three-dimensional frameworks in which the layers are tethered together by BO3 units found roughly perpendicular to the sheets. Furthermore, a change in product is observed depending on the reaction duration while holding all other synthetic variables constant. This report also demonstrates that lanthanide borates can be prepared in extreme acidic conditions.

Document Type:	Article
Research affiliation:	OceanRep > The Future Ocean - Cluster of Excellence Kiel University
Refereed:	Yes
Open Access Journal?:	No
Publisher:	American Chemical Society
Projects:	Future Ocean
Date Deposited:	14 May 2014 09:42
Last Modified:	31 Jul 2019 05:21
URI:	https://oceanrep.geomar.de/id/eprint/24210

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