Europium (III) complexes derived from carboxylic-substituted polychlorotriphenylmethyl radicals

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• 作者：Nans Roques ; S ; rine Perruchas ; Daniel Maspoch ; Angela Datcu ; Klaus Wurst ; Jean-Pascal Sutter ; Concepció ; Rovira ; Jaume Veciana
• 关键词：PTM radicals ; Carboxylates ; Europium (III) ; Molecular magnetism ; Separated ion pairs
• 刊名：Inorganica Chimica Acta
• 出版年：2007
• 出版时间：1 October 2007
• 年：2007
• 卷：360
• 期：13
• 页码：3861-3869
• 全文大小：1293 K

文摘

Two europium (III) complexes (3 and 4) have been obtained reacting europium (III) nitrate and two polychlorotriphenylmethyl radicals properly functionalized with one (PTMMC⁻, 1) and six (PTMHC⁶⁻, 2) carboxylate groups, respectively. While complex 3 reveals a lamellar polar–apolar separated ion pair structure alternating PTM-based bilayers with nonaaquaeuropium cations ([Eu(H₂O)₉](PTMMC)₃(PTMMCH)₃ · 7H₂O · 6EtOH), complex 4 shows a one-dimensional chain-like structure with formula [Eu₂(PTMHC)(H₂O)₁₃] · 16H₂O · EtOH. Magnetic properties of both complexes were studied in the 2–300 K range, and show the presence of weak inter-radical antiferromagnetic interactions below 5 K.