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Issue 40, 2015
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Three tetracoordinate Co(ii) complexes [Co(biq)X2] (X = Cl, Br, I) with easy-plane magnetic anisotropy as field-induced single-molecule magnets

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Abstract

Three mononuclear complexes [Co(biq)X2] (biq = 2,2′-biquinoline; X = Cl, Br, I) were prepared by a solvothermal method and characterized by single-crystal X-ray diffraction. In all three complexes the Co(II) atom is tetrahedrally coordinated by one biq ligand bonded in a chelate manner and two halogenido ligands. Hydrogen bonding interactions (C–H⋯X) along with the π–π interactions contribute to the stability of the formed packing. Magnetic measurements as well as ab initio calculations revealed that the complexes possess a sizable easy-plane magnetic anisotropy (D > 0). They display a superparamagnetic behaviour in an applied external field that culminates between BDC = 0.2–0.3 T. Two relaxation processes are observed; the faster can be analysed in terms of the direct and Orbach processes yielding U/kB = 42.6 K and τ0 = 1.9 × 10−10 s for X = Cl, U/kB = 39.6 K and τ0 = 1.2 × 10−10 s for X = Br and U/kB = 57.0 K and τ0 = 3.2 × 10−13 s for X = I at BDC = 0.2 T.

Graphical abstract: Three tetracoordinate Co(ii) complexes [Co(biq)X2] (X = Cl, Br, I) with easy-plane magnetic anisotropy as field-induced single-molecule magnets

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Supplementary files

Article information


Submitted
24 Jul 2015
Accepted
08 Sep 2015
First published
09 Sep 2015

Dalton Trans., 2015,44, 17565-17571
Article type
Paper

Three tetracoordinate Co(II) complexes [Co(biq)X2] (X = Cl, Br, I) with easy-plane magnetic anisotropy as field-induced single-molecule magnets

L. Smolko, J. Černák, M. Dušek, J. Miklovič, J. Titiš and R. Boča, Dalton Trans., 2015, 44, 17565
DOI: 10.1039/C5DT02827B

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