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Highly Luminescent Salts Containing Well-Shielded Lanthanide-Centered Complex Anions and Bulky Imidazolium Countercations

TitleHighly Luminescent Salts Containing Well-Shielded Lanthanide-Centered Complex Anions and Bulky Imidazolium Countercations
Publication TypeJournal Article
Year of Publication2014
AuthorsTang, SF, Lorbeer, C, Wang, XJ, Ghosh, P, Mudring, AV
JournalInorganic Chemistry
Volume53
Pagination9027-9035
Date Published09
Type of ArticleArticle
ISBN Number0020-1669
Accession NumberWOS:000341229600025
Keywordsbeta-diketonate complexes, catalysis, crystal-structure, eu3+, Europium, photoluminescence, polarity, quantum yield, solvents, temperature ionic liquids
Abstract

Four salts containing imidazolium cations and europium(III)- or terbium(III)-centered complex anions have been successfully synthesized from an ethanol/H2O solution. The single-crystal X-ray diffraction analyses reveal that these compounds have a common formula of [R] [Ln(DETCAP)(4)] [R = 1-ethyl-3-methylimidazolium (C(2)mim), Ln = Eu (1) and Tb (2); R = 1-butyl-3-methylimidazolium (C(4)mim), Ln = Eu (3) and Tb (4); DETCAP = diethyl-2,2,2-trichloroacetylphosphoramidate], in which the lanthanide centers are chelated by four chelating pseudo-beta-diketonate ligands (DETCAP)(-), forming the respective complex anions. Their thermal behaviors and stabilities were also investigated to study the role of the length of the side chain in the cations. Fluorescence measurements at both room temperature and liquid-nitrogen temperature show that these materials show intense characteristic europium(III) or terbium(III) emissions and have long decay times. Their overall quantum yields were determined to be in the range of 30-49%.

DOI10.1021/ic500979p
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