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A single-chain magnet based on {Co(II)₄} complexes and azido/picolinate ligands
Jiang Liu1, Mei Qu, Mathieu Rouzières
1School of Chemistry & Material Science, Shanxi Normal University , Linfen, 041004, People's Republic of China.
Abstract:
A new homonuclear single-chain magnet self-assembles as a one-dimensional coordination network of defective dicubane {Co(II)4} complexes linked by single Co(II) ions with the assistance of azido and picolinate ligands. Dominating intrachain ferromagnetic interactions, intrinsic Ising-like Co(II) anisotropy, and negligible interchain magnetic interactions lead to a thermally activated relaxation time of the magnetization below 8 K. Two thermally activated regimes above and below 3.5 K are observed with the following energy barriers: Δ(τ1)/k(B) = 66 K (τ0 = 3.7 × 10(-11) s) and Δ(τ2)/k(B) = 51 K (τ0 = 2.3 × 10(-9) s), respectively. The difference between the two energy barriers of the relaxation time, 15 K, agrees well with the experimental energy, Δ(ξ), to create a domain wall along the chain.
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