Two mononuclear square-planar Cr(II) complexes are reported, exhibiting field-induced slow magnetic relaxation. The axial zero-field splitting parameter was unambiguously determined by both a high-frequency/field electron paramagnetic resonance (HF-EPR) technique and magnetic measurements. This result represents the first observed single-molecule-magnet behavior in the square planar coordination geometry of any metal ions.
A new tripodal hexadentate ligand of tris[6-(1H-pyrazol-1-yl)pyridin-2-yl]methanol (tppm) was synthesized and explored for constructing the trigonal-prismatic cobalt(II) complex [Co(tppm)]- 1). Magnetic study showed that 1 exhibited large uniaxial magnetic anisotropy with a zerofield-splitting parameter of −80.7 cm −1 and typical singlemolecule-magnet behavior.
A trigonal-planar Fe(iii) complex Fe[N(SiMe3)2]3 with a high spin state (S = 5/2) was investigated by magnetic and HF-EPR measurements, exhibiting distinct dynamic magnetic behaviour.
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