Magnetization relaxation dynamics of a rare coordinatively unsaturated Co(II) complex: experimental and theoretical insights

A robust and unusual three coordinate Co(II) complex [Li(DME)₃][Co(L)₃] (1, where L = Lithium (2,6-diisopropylphenyl) amide and DME = Dimethoxyethane) shows easy plane magnetic anisotropy (D) which is validated by variable temperature X-band EPR studies. 1 also registered with the largest anisotropic barrier (51.1 K, τ₀ = 1.98 × 10⁻⁸ s; H_dc ≠ 0) to the magnetization reversal among the three coordinate Co(II) complexes. The role of its geometry on the SH parameters and the experimental observations are rationalized by theoretical calculations including the origin of magnetic anisotropy.