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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Regulation of magnetic relaxation behavior by replacing 3d transition metal ions in [M2Dy2] complexes containing two different organic chelating ligands
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Regulation of magnetic relaxation behavior by replacing 3d transition metal ions in [M2Dy2] complexes containing two different organic chelating ligands

机译：通过替换含有两种不同有机螯合配体的[M2DY2]配合物中的3D过渡金属离子来调节磁性松弛行为

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摘要

Four tetranuclear 3d-4f complexes, namely [Fe(2)Ln(2)(L)(2)(teaH)(2)(Cl)(2)](NO3)(2)4CH(3)CN (H2L = N1,N3-bis(3-methoxysalicylidene)diethylenetriamine, teaH(3) = triethanolamine, Ln = Dy for 1 and Ln = Gd for 1 ') and [Co(2)Ln(2)(L)(2)(pdm)(2)(CH3COO)(2)(CH3OH)(2)](NO3)(2)xCH(3)OHyH(2)O (pdmH(2) = 2,6-pyridinedimethanol, Ln = Dy, x = 5 and y = 2.5 for 2 and Ln = Gd, x = 6 and y = 1.5 for 2 '), have been reported. Two Fe-III and two Dy-III in 1 formed a zigzag Fe1-Dy1-Dy1a-Fe1a arrangement with a Fe1-Dy1-Dy1a angle of 105.328(3)degrees. However, in contrast to 1, two Co-III and two Dy-III ions in 2 formed a more linear Co1-Dy1-Dy1a-Co1a arrangement with a Co1-Dy1-Dy1a angle of 141.86(2)degrees. Additionally, two Dy-III ions in 1 are eight-coordinated with a triangular dodecahedron geometry, while two Dy-III ions in 2 adopt nine-coordination with a muffin geometry. Magnetic studies revealed slow magnetic relaxation behavior for 1, with an energy barrier E-a of 6.9 K. For 2, single molecule magnet behavior was presented under a zero dc field with an effective energy barrier U-eff of 64.0(9) K. Ab initio calculations for 1 and 2 indicate that compared to 2, complex 1 has a larger transversal magnetic moment of its ground Kramers doublets (KD) and a larger value of the tunnelling parameter (Delta(t)) for the exchanged coupled ground state, which may result in poor single molecule magnet behavior for 1.
机译：四种四核3D-4F复合物，即[Fe（2）LN（2）（1）（2）（2）（2）（2）（2）]（2）（2）（2）4CH（3）CN（H2L = N1，N3-BIS（3-甲醇钠）二亚乙基三胺，TeaH（3）=三乙醇胺，LN = Dy 1和Ln = Gd为1'）和[Co（2）LN（2）（1）（2）（PDM ）（2）（CH 3 CHOO）（2）（2）（2）（2）]（2）（2）Xch（3）OHYH（2）O（PDMH（2）= 2,6-吡啶二甲醇，LN = Dy，x =已经报道了5和y = 2.5对于2和ln = gd，x = 6和2'），x = 6和y = 1.5）。在1中的两个Fe-III和两个DY-III形成了Zigzag Fe1-DY1-DY1A-FE1A布置，Fe1-DY1-DY1A角度为105.328（3）度。然而，与1，2中的2个CO-III和2个DY-III离子相比，形成了更具有141.86（2）度的CO1-DY1-DY1a的CO1-DY1A-CO1A布置。另外，1中的两个Dy-III离子与三角形十二锭几何形状八个 - 配位，而2中的两个Dy-III离子用松饼几何形状采用九个配位。磁性研究揭示了1的缓慢磁性弛豫行为，其中能量屏障EA为6.9K。对于2，在零DC场下呈现单分子磁体行为，其中有效的能量屏障U-uff为64.0（9）K. AB Initio 1和2的计算表明，与2相比，复合物1具有较大的跨越克拉姆的横向磁矩（KD）和更大的隧道参数（Delta（T））的较大值，用于交换耦合的接地状态，可以导致单分子磁体行为不良1。

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    Wang Hui-Sheng; Yin Cheng-Ling; Hu Zhao-Bo; Chen Yong; Pan Zhi-Quan; Song You; Zhang Yi-Quan; Zhang Zai-Chao;

  • 作者单位

    Wuhan Inst Technol Minist Educ Key Lab Green Chem Proc Sch Chem &

    Environm Engn Wuhan 430074 Hubei Peoples R China;

    Wuhan Inst Technol Minist Educ Key Lab Green Chem Proc Sch Chem &

    Environm Engn Wuhan 430074 Hubei Peoples R China;

    Nanjing Univ Collaborat Innovat Ctr Adv Microstruct Sch Chem &

    Chem Engn State Key Lab Coordinat Chem Nanjing 210046 Jiangsu Peoples R China;

    Wuhan Inst Technol Minist Educ Key Lab Green Chem Proc Sch Chem &

    Environm Engn Wuhan 430074 Hubei Peoples R China;

    Wuhan Inst Technol Minist Educ Key Lab Green Chem Proc Sch Chem &

    Environm Engn Wuhan 430074 Hubei Peoples R China;

    Nanjing Univ Collaborat Innovat Ctr Adv Microstruct Sch Chem &

    Chem Engn State Key Lab Coordinat Chem Nanjing 210046 Jiangsu Peoples R China;

    Nanjing Normal Univ Sch Phys Sci &

    Technol Jiangsu Key Lab NSLSCS Nanjing 210023 Jiangsu Peoples R China;

    Huaiyin Normal Univ Sch Chem &

    Chem Engn Jiangsu Key Lab Chem Low Dimens Mat Huaian Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;无机化学;
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