Journal
INORGANICA CHIMICA ACTA
Volume 360, Issue 13, Pages 3861-3869Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.ica.2007.03.021
Keywords
PTM radicals; carboxylates; europium (III); molecular magnetism; separated ion pairs
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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) center dot 7H(2)O center dot 6EtOH), complex 4 shows a one-dimensional chain-like structure with formula [EU2(PTMHC)(H2O)(13)] center dot 16H(2)O center dot 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. (c) 2007 Elsevier B.V. All rights reserved.
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