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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Field-induced slow relaxation of magnetization in a tetrahedral Co(ii) complex with easy plane anisotropy
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Field-induced slow relaxation of magnetization in a tetrahedral Co(ii) complex with easy plane anisotropy

机译：四面体Co（ii）配合物具有平面各向异性的磁场诱导的磁化慢弛豫

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摘要

The mononuclear Co(ii) complex dmphCoBr (dmph = 2,9-dimethyl-1,10- phenanthroline) was obtained and X-ray structurally characterized as a distorted tetrahedron environment that is responsible for the moderately strong positive anisotropy of high spin Co(ii). In combination with variable-field magnetic susceptibility data at low temperature, high-field electron paramagnetic resonance (HF-EPR) spectroscopy reveals the presence of easy-plane anisotropy (D > 0) in complex dmphCoBr. Slow magnetic relaxation effects were observed for dmphCoBr in the presence of a dc magnetic field. At very low temperatures, ac magnetic susceptibility data show the magnetic relaxation time, τ, to be temperature-independent, while above 2.4 K thermally activated Arrhenius behavior is dominated with U_(eff) = 22.8(8) cm~(-1) and τ_0 = 3.7(5) × 10~(-10) s. Upon dilution of the complex within a matrix of the isomorphous compound dmphZnBr, ac susceptibility data reveal the individual molecular nature of the slow magnetic relaxation and indicate that the quantum tunneling pathway observed at low temperatures is likely mediated by intermolecular dipolar interactions.
机译：获得了单核Co（ii）复合物dmphCoBr（dmph = 2,9-二甲基-1,10-菲咯啉），并且X射线的结构特征是扭曲的四面体环境，该环境导致了高自旋Co（）具有中等强的正各向异性ii）。结合低温下的可变场磁化率数据，高场电子顺磁共振（HF-EPR）光谱显示复杂dmphCoBr中存在易平面各向异性（D> 0）。在直流磁场的存在下，dmphCoBr的磁弛豫效果很慢。在非常低的温度下，交流磁化率数据显示磁弛豫时间τ与温度无关，而在2.4 K以上，热激活的Arrhenius行为主要受U_（eff）= 22.8（8）cm〜（-1）和τ_0= 3.7（5）×10〜（-10）秒在同构化合物dmphZnBr的基质中稀释复合物后，ac磁化率数据揭示了缓慢磁弛豫的单个分子性质，并表明在低温下观察到的量子隧穿途径可能由分子间偶极相互作用介导。

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