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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Synthetic, structural, spectroscopic and theoretical study of a Mn(iii)-Cu(ii) dimer containing a Jahn-Teller compressed Mn ion
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Synthetic, structural, spectroscopic and theoretical study of a Mn(iii)-Cu(ii) dimer containing a Jahn-Teller compressed Mn ion

机译:包含Jahn-Teller压缩Mn离子的Mn(iii)-Cu(ii)二聚体的合成,结构,光谱和理论研究

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摘要

The heterobimetallic complex [Cu(ii)Mn(iii)(L)_2(py) _4](ClO_4)·EtOH (1) built using the pro-ligand 2,2′-biphenol (LH_2), contains a rare example of a Jahn-Teller compressed Mn(iii) centre. Dc magnetic susceptibility measurements on 1 reveal a strong antiferromagnetic exchange between the Cu(ii) and Mn(iii) ions mediated through the phenolate O-atoms (J = -33.4 cm-1), with magnetisation measurements at low temperatures and high fields suggesting significant anisotropy. Simulations of high-field and high frequency powder EPR data suggest a single-ion anisotropy D_(Mn(III)) = +4.45 cm~(-1). DFT calculations also yield an antiferromagnetic exchange for 1, though the magnitude is overestimated (J_(DFT) = -71 cm~(-1)). Calculations reveal that the antiferromagnetic interaction essentially stems from the Mn(d_x ~2-y~2)-Cu(d_x ~2-y ~2) interaction. The computed single-ion anisotropy and cluster anisotropy also correlates well with experiment. A larger cluster anisotropy for the S = 3/2 state compared to the single-ion anisotropy of Mn(iii) is rationalised on the basis of orbital mixing and various contributions that arise due to the spin-orbit interaction.
机译:使用原配体2,2'-双酚(LH_2)构建的杂双金属配合物[Cu(ii)Mn(iii)(L)_2(py)_4](ClO_4)·EtOH(1)包含Jahn-Teller压缩的Mn(iii)中心。 1的Dc磁化率测量表明,通过酚盐O原子(J = -33.4 cm-1)介导的Cu(ii)和Mn(iii)离子之间存在强反铁磁交换,在低温和高磁场下的磁化强度表明显着的各向异性。高场和高频粉末EPR数据的模拟表明,单离子各向异性D_(Mn(III))= +4.45 cm〜(-1)。 DFT计算也会产生1的反铁磁交换,尽管幅度被高估了(J_(DFT)= -71 cm〜(-1))。计算表明,反铁磁相互作用主要源于Mn(d_x〜2-y〜2)-Cu(d_x〜2-y〜2)相互作用。计算的单离子各向异性和簇各向异性也与实验很好地相关。与Mn(iii)的单离子各向异性相比,S = 3/2态的较大簇各向异性是合理的,这是基于轨道混合和由于自旋轨道相互作用而产生的各种贡献。

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