Details

Autor(en) / Beteiligte

• Pohako-Esko, Kaija
• Wehner, Tobias
• Schulz, Peter S.
• Heinemann, Frank W.
• Müller-Buschbaum, Klaus
• Wasserscheid, Peter

Titel

Synthesis and Properties of Organic Hexahalocerate(III) Salts

Ist Teil von

• European journal of inorganic chemistry, 2016-03, Vol.2016 (9), p.1333-1339

Ort / Verlag

Weinheim: WILEY-VCH Verlag

Erscheinungsjahr

2016

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• A series of hexahalocerate(III) salts with the general formula [cation]3[CeHal6] have been prepared by dissolving anhydrous cerium trihalides in imidazolium halide ionic liquids. Complexes with different anions, [CeCl6]3–, [CeBr6]3– and [CeBr3Cl3]3–, were synthesized and their cationic alkyl chains were varied. To confirm the structures of the prepared salts, X‐ray crystallography was used to characterize [BMIM]3[CeCl6]. Two different crystal structures were found: [BMIM]3[CeCl6] and the linear coordination polymer [BMIM]x[Ce(µ‐Cl)2Cl2(EtOH)2]x containing coordinated solvent. All the synthesized compounds were characterized by DSC and TGA. The influence of the cationic and anionic structures on the melting points and decomposition temperatures is discussed. Furthermore, the Ce‐containing salts [BMIM]3[CeHal6] show interesting photoluminescence properties: intense Ce3+‐based 5d–4f‐centred emission from the soft UV‐B region to the border of visible light is observed that is driven both by direct excitation of Ce3+ as well as by a sensitizer effect of the [BMIM]+ cation. Hexahalocerate(III) salts with the general formula [cation]3[CeHal6] have been prepared by dissolving anhydrous cerium halides in 1‐alkyl‐3‐methylimidazolium halide ionic liquids. The structure of [BMIM]3[CeCl6] as a prototypical representative was confirmed by X‐ray crystallographic analysis. The thermal and photoluminescence properties of the hexahalocerates(III) are discussed.