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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >A family of lanthanide complexes with a bis-tridentate nitronyl nitroxide radical: syntheses, structures and magnetic properties
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A family of lanthanide complexes with a bis-tridentate nitronyl nitroxide radical: syntheses, structures and magnetic properties

机译:具有双三乙腈硝基氧化物的一系列镧系元素复合物:合成,结构和磁性

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摘要

Eleven new lanthanide complexes based on a bis-tridentate nitronyl nitroxide radical NIT-Pm2Py (2-(4,6-di(pyridin-2-yl)pyrimidin-2-yl)-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazol-1-oxy-3-oxide), namely (NIT-Pm2Py)Ln(hfac)(3) (Ln = Gd (1(Gd)), Tb (2(Tb)), Dy (3(Dy)), Ho (4(Ho)), Er (5(Er)), Yb (6(Yb))), [(NIT-Pm2Py)Ln(2)(hfac)(6)]xH(2)O (Ln = Gd (7(Gd)), Tb (8(Tb)), Ho (10(Ho)), x = 0.5 for 7(Gd) and 1 for 8(Tb) and 10(Ho)) and (NIT-Pm2Py)Ln(2)(hfac)(6) (Ln = Dy (9(Dy)), Er (11(Er))) were prepared and characterized. These complexes can be selectively prepared by controlling the reaction ratio of Ln(hfac)(3)2H(2)O to the radical ligand NIT-Pm2Py. Single crystal X-ray crystallographic analyses confirmed that 1(Gd)-6(Yb) are isostructural 2p-4f Ln(III)-radical complexes, in which the NIT-Pm2Py radical acts as a terminal tridentate ligand chelating to one Ln(III) ion. On the other hand, 7(Gd)-11(Er) are isostructural 4f-2p-4f Ln(III)-radical-Ln(III) complexes with the NIT-Pm2Py acting as a bridging ligand between two Ln(III) ions. 7(Gd)-11(Er) represent a rare family of complexes showing the NIT bridged 4f-2p-4f three-spin motif. Alternating-current (ac) magnetic susceptibility investigations revealed that complex 6(Yb) exhibits field-induced frequency dependence, suggesting a possible field-induced single-molecule magnet behavior. Ab initio calculations were performed on all these complexes. The fitting of the magnetic susceptibilities of these complexes indicates weak antiferromagnetic coupling between the Ln(III) and NIT radical.
机译:11新的镧系元络合物基于双三乙腈硝基氧化氮基硝基镍氢镍氢镍氢化合物(2-(4,6-二(吡啶-2-基)嘧啶-2-基)-4,4,5,5-四甲基-4 ,5-二氢-1H-咪唑-1-氧-3-氧化物),即(NIT-PM2PY)LN(HFAC)(3)(LN = GD(1(GD)),TB(2(TB)), (3(Dy)),HO(4(HO)),ER(5(ER)),Yb(6(YB))),[(NIT-PM2PY)LN(2)(HFAC)(6)] XH(2)O(LN = Gd(7(GD)),TB(8(TB)),HO(10(HO)),x = 0.5,7(GD)和8(TB)和10( HO))和(NIT-PM2PY)LN(2)(HFAC)(6)(LN = Dy(9(Dy)),制备和表征ER(11(ER))。通过将LN(HFAC)(3)2H(2)O至自由基配体NIT-PM2PY的反应比控制,可以选择性地制备这些配合物。单晶X射线结晶分析证实,1(GD)-6(YB)是isostrontucture 2P-4F LN(III)的络合物,其中NIT-PM2PY自由基作为末端三齿配体螯合到一个LN(III) ) 离子。另一方面,7(GD)-11(ER)是具有镍氢滴水剂的ISOStrontucture 4F-2P-4F LN(III)络合物作为两个LN(III)离子之间的桥接配体。 。 7(GD)-11(ER)代表罕见的复合物系列,呈现NIT桥接的4F-2P-4F三旋基图案。交替电流(AC)磁性敏感性研究表明,复合物6(YB)表现出现场诱导的频率依赖性,表明可能的场诱导的单分子磁体行为。对所有这些复合物进行AB初始计算。这些配合物的磁性敏感性的拟合表明LN(III)和NIT基团之间的弱反铁磁性耦合。

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    Nanjing Univ Sch Chem &

    Chem Engn Collaborat Innovat Ctr Adv Microstruct State Key Lab Coordinat Chem Nanjing 210023 Jiangsu Peoples R China;

    Nanjing Univ Sch Chem &

    Chem Engn Collaborat Innovat Ctr Adv Microstruct State Key Lab Coordinat Chem Nanjing 210023 Jiangsu Peoples R China;

    Nanjing Univ Sch Chem &

    Chem Engn Collaborat Innovat Ctr Adv Microstruct State Key Lab Coordinat Chem Nanjing 210023 Jiangsu Peoples R China;

    Nanjing Normal Univ Sch Chem &

    Mat Sci Jiangsu Key Lab Biofunct Mat Nanjing 210023 Jiangsu Peoples R China;

    Nanjing Normal Univ Sch Phys Sci &

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

    Nanjing Univ Sch Chem &

    Chem Engn Collaborat Innovat Ctr Adv Microstruct State Key Lab Coordinat Chem Nanjing 210023 Jiangsu 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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