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Complexes (bmim) 2 [Cu 3 (μ 3 -Cl) 2 (μ-pz) 3 Cl 3 ] (1), (bmim)[Cu 3 (μ 3 -OH)(μ-pz) 3 Cl 3 ] (2) and (bmim) 2 [Cu 3 (μ 3 -OH)(μ-Cl)(μ-pz) 3 Cl 3 ] (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 (D 3/2 ∼ 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 Bu 4 N + analogues (1PPN and 1Bu 4 N, respectively, PPN + = bis(triphenylphosphine)iminium). Upon cooling, 1 remains molten down to 70 °C. Mixtures of the salts 1, 1PPN and 1Bu 4 N, exhibited modified melting behaviours, with the mixtures exhibiting lower melting points than those of either of their pure components.

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

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