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The task\u2010specific ionic liquid betainium bis(trifluoromethylsulfonyl)imide ([Hbet][Tf<jats:sub>2<\/jats:sub>N]) is able to dissolve stoichiometric amounts of the oxides of the rare\u2010earth elements. The crystal structures of the compounds [Eu<jats:sub>2<\/jats:sub>(bet)<jats:sub>8<\/jats:sub>(H<jats:sub>2<\/jats:sub>O)<jats:sub>4<\/jats:sub>][Tf<jats:sub>2<\/jats:sub>N]<jats:sub>6<\/jats:sub>, [Eu<jats:sub>2<\/jats:sub>(bet)<jats:sub>8<\/jats:sub>(H<jats:sub>2<\/jats:sub>O)<jats:sub>2<\/jats:sub>][Tf<jats:sub>2<\/jats:sub>N]<jats:sub>6<\/jats:sub>\u22c52H<jats:sub>2<\/jats:sub>O, and [Y<jats:sub>2<\/jats:sub>(bet)<jats:sub>6<\/jats:sub>(H<jats:sub>2<\/jats:sub>O)<jats:sub>4<\/jats:sub>][Tf<jats:sub>2<\/jats:sub>N]<jats:sub>6<\/jats:sub> were found to consist of dimers. These rare\u2010earth complexes are well soluble in the ionic liquids [Hbet][Tf<jats:sub>2<\/jats:sub>N] and [C<jats:sub>4<\/jats:sub>mim][Tf<jats:sub>2<\/jats:sub>N] (C<jats:sub>4<\/jats:sub>mim=1\u2010butyl\u20103\u2010methylimidazolium). The speciation of the metal complexes after dissolution in these ionic liquids was investigated by luminescence spectroscopy, <jats:sup>1<\/jats:sup>H, <jats:sup>13<\/jats:sup>C, and <jats:sup>89<\/jats:sup>Y\u2005NMR spectroscopy, and by the synchrotron techniques EXAFS (extended X\u2010ray absorption fine structure) and HEXS (high\u2010energy X\u2010ray scattering). The combination of these complementary analytical techniques reveals that the cationic dimers decompose into monomers after dissolution of the complexes in the ionic liquids. Deeper insight into the solution processes of metal compounds is desirable for applications of ionic liquids in the field of electrochemistry, catalysis, and materials chemistry.<\/jats:p>","DOI":"10.1002\/chem.200801418","type":"journal-article","created":{"date-parts":[[2009,1,2]],"date-time":"2009-01-02T20:16:16Z","timestamp":1230927376000},"page":"1449-1461","source":"Crossref","is-referenced-by-count":96,"title":["Speciation of Rare\u2010Earth Metal Complexes in Ionic Liquids: A Multiple\u2010Technique Approach"],"prefix":"10.1002","volume":"15","author":[{"given":"Peter","family":"Nockemann","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ben","family":"Thijs","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kyra","family":"Lunstroot","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tatjana\u2005N.","family":"Parac\u2010Vogt","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Christiane","family":"G\u00f6rller\u2010Walrand","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Koen","family":"Binnemans","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kristof","family":"Van\u2005Hecke","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Luc","family":"Van\u2005Meervelt","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sergey","family":"Nikitenko","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"John","family":"Daniels","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Christoph","family":"Hennig","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rik","family":"Van\u2005Deun","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2009,1,20]]},"reference":[{"key":"e_1_2_6_1_2","doi-asserted-by":"publisher","DOI":"10.1021\/cr980032t"},{"key":"e_1_2_6_2_2","doi-asserted-by":"publisher","DOI":"10.1002\/1521-3757(20001103)112:21<3926::AID-ANGE3926>3.0.CO;2-U"},{"key":"e_1_2_6_2_3","doi-asserted-by":"publisher","DOI":"10.1002\/1521-3773(20001103)39:21<3772::AID-ANIE3772>3.0.CO;2-5"},{"key":"e_1_2_6_3_2","doi-asserted-by":"publisher","DOI":"10.1002\/(SICI)1097-4660(199704)68:4<351::AID-JCTB613>3.0.CO;2-4"},{"key":"e_1_2_6_4_2","doi-asserted-by":"publisher","DOI":"10.1021\/ic951325x"},{"key":"e_1_2_6_5_2","doi-asserted-by":"publisher","DOI":"10.1016\/S1381-1169(01)00465-4"},{"key":"e_1_2_6_6_2","doi-asserted-by":"publisher","DOI":"10.1021\/ol9907771"},{"key":"e_1_2_6_7_2","doi-asserted-by":"publisher","DOI":"10.1021\/cr010338r"},{"key":"e_1_2_6_8_2","doi-asserted-by":"publisher","DOI":"10.1021\/es0158004"},{"key":"e_1_2_6_9_2","doi-asserted-by":"publisher","DOI":"10.1002\/chem.200500741"},{"key":"e_1_2_6_10_2","doi-asserted-by":"publisher","DOI":"10.1002\/chem.200500559"},{"key":"e_1_2_6_11_2","doi-asserted-by":"publisher","DOI":"10.1002\/ange.200350912"},{"key":"e_1_2_6_11_3","doi-asserted-by":"publisher","DOI":"10.1002\/anie.200350912"},{"key":"e_1_2_6_12_2","doi-asserted-by":"publisher","DOI":"10.1179\/002029605X17657"},{"key":"e_1_2_6_13_2","doi-asserted-by":"publisher","DOI":"10.1149\/1.2760185"},{"key":"e_1_2_6_14_2","doi-asserted-by":"publisher","DOI":"10.1149\/1.1837171"},{"key":"e_1_2_6_15_2","doi-asserted-by":"publisher","DOI":"10.1021\/jp0355399"},{"key":"e_1_2_6_16_2","doi-asserted-by":"publisher","DOI":"10.1021\/cm061704w"},{"key":"e_1_2_6_17_2","first-page":"183","volume":"52","author":"Taubert A.","year":"2005","journal-title":"Acta Chim. 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