Three tetracoordinate Co(II) complexes [Co(biq)X.sub.2./sub.] (X = Cl, Br, I) with easy-plane magnetic anisotropy as field-induced single-molecule magnets

0456411 - FZÚ 2016 RIV GB eng J - Journal Article
Smolko, I. - Černák, J. - Dušek, Michal - Miklovič, C. - Titiš, J. - Boča, R.
Three tetracoordinate Co(II) complexes [Co(biq)X₂] (X = Cl, Br, I) with easy-plane magnetic anisotropy as field-induced single-molecule magnets.
Dalton Transactions. Roč. 44, č. 40 (2015), s. 17565-17571. ISSN 1477-9226. E-ISSN 1477-9234
Institutional support: RVO:68378271
Keywords : crystal structure * cobalt * superparamagnetism * magnetic properties * biquinoline
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 4.177, year: 2015

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.
Permanent Link: http://hdl.handle.net/11104/0256943