Ln12 -Containing 60-Tungstogermanates: Synthesis, Structure, Luminescence, and Magnetic Studies

Kai-Yao Wang; Bassem S Bassil; Zhengguo Lin; Isabella Römer; Stef Vanhaecht; Tatjana N Parac-Vogt; Cristina Sáenz de Pipaón; José Ramón Galán-Mascarós; Linyuan Fan; Jie Cao; Ulrich Kortz

doi:10.1002/chem.201502457

Ln12 -Containing 60-Tungstogermanates: Synthesis, Structure, Luminescence, and Magnetic Studies

Chemistry. 2015 Dec 7;21(50):18168-76. doi: 10.1002/chem.201502457. Epub 2015 Nov 6.

Authors

Affiliations

¹ Jacobs University, Department of Life Sciences and Chemistry, P.O. Box 750 561, 28725 Bremen (Germany) http://www.jacobs-university.de/ses/ukortz.
² Department of Chemistry, Faculty of Sciences, University of Balamand, P.O. Box 100, Tripoli (Lebanon).
³ Department of Chemistry, KU Leuven, Celestijnenlaan 200F, 3001 Leuven (Belgium).
⁴ Institute of Chemical Research of Catalonia (ICIQ), Av. Paisos Catalans 16, 43007 Tarragona (Spain).
⁵ Catalan Institution for Research and Advanced Studies (ICREA), Passeig Lluis Companys, 23, 08010, Barcelona (Spain).
⁶ Key Laboratory of Cluster Science, Ministry of Education of China, Beijing Key Laboratory of Photoelectronic/Electrophotonic, Conversion Materials, School of Chemistry, Beijing Institute of Technology, Beijing 100081 (P.R. China).
⁷ Jacobs University, Department of Life Sciences and Chemistry, P.O. Box 750 561, 28725 Bremen (Germany) http://www.jacobs-university.de/ses/ukortz. [email protected].

PMID: 26541771
DOI: 10.1002/chem.201502457

Abstract

A new class of hexameric Ln12 -containing 60-tungstogermanates, [Na(H2 O)6 ⊂Eu12 (OH)12 (H2 O)18 Ge2 (GeW10 O38 )6 ](39-) (Eu12 ), [Na(H2 O)6 ⊂Gd12 (OH)6 (H2 O)24 Ge(GeW10 O38 )6 ](37-) (Gd12 ), and [(H2 O)6 ⊂Dy12 (H2 O)24 (GeW10 O38 )6 ](36-) (Dy12 ), comprising six di-Ln-embedded {β(4,11)-GeW10 } subunits was prepared by reaction of [α-GeW9 O34 ](10-) with Ln(III) ions in weakly acidic (pH 5) aqueous medium. Depending on the size of the Ln(III) ion, the assemblies feature selective capture of two (for Eu12 ), one (for Gd12 ), or zero (for Dy12 ) extra Ge(IV) ions. The selective encapsulation of a cationic sodium hexaaqua complex [Na(H2 O)6 ](+) was observed for Eu12 and Gd12 , whereas Dy12 incorporates a neutral, distorted-octahedral (H2 O)6 cluster. The three compounds were characterized by single-crystal XRD, ESI-MS, photoluminescence, and magnetic studies. Dy12 was shown to be a single-molecule magnet.

Keywords: lanthanides; luminescence; magnetic properties; polyoxometalates; tungsten.

Publication types

Research Support, Non-U.S. Gov't