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Issue 36, 2017
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Towards ionic liquids with tailored magnetic properties: bmim+ salts of ferro- and antiferromagnetic CuII3 triangles

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Abstract

Complexes (bmim)2[Cu33-Cl)2(μ-pz)3Cl3] (1), (bmim)[Cu33-OH)(μ-pz)3Cl3] (2) and (bmim)2[Cu33-OH)(μ-Cl)(μ-pz)3Cl3] (3) were synthesized (bmim+ = 1-butyl-3-methylimidazolium, pz = pyrazolato anion). Dianionic complexes 1 and 3 were obtained as crystalline solids, whereas the monoanionic complex 2 was obtained as a viscous paste. Magnetic susceptibility and X-band EPR studies revealed intramolecular ferromagnetic interactions for 1 with small magnetoanisotropy in its ground state (D3/2 ∼ 10−3 cm−1) and intramolecular antiferromagnetic interactions for 2 and 3 (−285 and −98 cm−1 average J, respectively) with important magnetic anisotropy in their ground states stemming from a combination of low magnetic symmetry and antisymmetric exchange interactions. Thermal studies revealed a clear melting point of 140 °C for 1, which is lower than that of its PPN+ and Bu4N+ analogues (1PPN and 1Bu4N, respectively, PPN+ = bis(triphenylphosphine)iminium). Upon cooling, 1 remains molten down to 70 °C. Mixtures of the salts 1, 1PPN and 1Bu4N, exhibited modified melting behaviours, with the mixtures exhibiting lower melting points than those of either of their pure components.

Graphical abstract: Towards ionic liquids with tailored magnetic properties: bmim+ salts of ferro- and antiferromagnetic CuII3 triangles

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Publication details

The article was received on 07 Jul 2017, accepted on 30 Aug 2017 and first published on 31 Aug 2017


Article type: Paper
DOI: 10.1039/C7DT02472J
Citation: Dalton Trans., 2017,46, 12263-12273
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    Towards ionic liquids with tailored magnetic properties: bmim+ salts of ferro- and antiferromagnetic CuII3 triangles

    A. K. Boudalis, G. Rogez, B. Heinrich, R. G. Raptis and P. Turek, Dalton Trans., 2017, 46, 12263
    DOI: 10.1039/C7DT02472J

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