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A series of planar tetranuclear lanthanide complexes: axial ligand modulated magnetic dynamics in Dy-4 species

机译:一系列平面四核镧系元素:DY-4种中的轴向配体调制磁动力学

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摘要

Ten new lanthanide compounds were successfully obtained based on an 8-hydroxyquinoline Schiff base derivative and b-diketonates with different substituent groups, namely, [Ln(4)(mu(3)-OH)(2)L-6(acac)(4)]center dot 2.5CH(3)CN (Ln = Gd (1), Tb (2), Dy (3), Ho (4) and Yb (5); HL = 5-(4-methoxybenzylidene)-8-hydroxylquinoline; Hacac = acetylacetone), [Ln(4)(mu(3)-OH)(2)L-6(tmhd)(4)]center dot xCH(3)CN center dot yCH(3)CH(2)OH (Ln = Eu (6), Gd (7), and Tb (8), x = 1, y =1; Ln = y (9), x = 2, y = 0; Htmhd = 2,2,6,6-tetramethyl-3,5-heptanedione) and [Dy-4(mu 3OH)(2)L-6(beac)(4)]center dot CH3CN (10) (Hbeac = 1-benzoylacetone). Single crystal X-ray diffraction revealed that compounds 1-10 all contain planar tetranuclear lanthanide centers with a similar butterfly-shape arrangement, and each lanthanide ion is located in a distorted bicapped trigonal prism coordination sphere. 1.Gd and 7.Gd exhibit magnetic refrigeration behavior with the maximum values of -Delta S-m being 19.39(2) and 16.21(3) J K-1 kg(-1), respectively. Additionally, the effects of steric-hindrance on the magnetic anisotropy of the Dy3+ centers in 3.Dy, 9.Dy and 10.Dy were observed through comparative studies on their magnetic behaviors, which showed different SMM behaviors with energy barriers of 99.29(3) K for 3.Dy, 64.56(4) K for 9.Dy and 61.05(0) K for 10.Dy.
机译:成功获得基于具有不同的取代基,即,[LN(4)(亩(3)-OH)(2)L-6(ACAC)(8-羟基喹啉的席夫碱衍生物和b二酮十个新镧系元素化合物4)]中心点2.5CH(3)CN(Ln为钆(1),TB(2),镝(3),浩(4)和Yb(5); HL = 5-(4-甲氧基亚苄基)-8- -hydroxylquinoline; Hacac =乙酰丙酮),[LN(4)(亩(3)-OH)(2)L-6(TMHD)(4)]中心点XCH(3)CN中心点YCH(3)CH(2 )OH(Ln为铕(6),钆(7)和Tb(8)中,x = 1,Y = 1; Ln为Y(9)中,x = 2,y = 0时; Htmhd = 2,2, 6,6-四甲基-3,5-庚二酮)和[镝-4(亩3OH)(2)L-6(中非)(4)]中心点CH 3 CN(10)(Hbeac = 1-苯甲酰丙酮)。单晶X射线衍射分析表明,化合物1-10全都包含平面四核镧系元素具有类似的蝴蝶形排列中心,并且每个镧系元素离子位于扭曲双帽三棱柱配位球。 1.Gd和7.Gd分别表现出磁制冷行为与-Delta S-m为19.39(2)和16.21(3).J K-1公斤(-1)的最大值。另外,是通过比较研究中观察到关于它们的磁性行为,这表明具有99.29能量壁垒不同SMM行为位阻对3.Dy,9.Dy和10.Dy的Dy3 +的中心的磁各向异性的影响(3 )K为3.Dy,64.56(4)K为9.Dy和61.05(0)K为10.Dy.

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  • 来源
    《RSC Advances》 |2017年第87期|共13页
  • 作者单位

    Hebei Univ Coll Chem &

    Environm Sci Baoding 071002 Peoples R China;

    Hebei Univ Coll Chem &

    Environm Sci Baoding 071002 Peoples R China;

    Hebei Univ Coll Chem &

    Environm Sci Baoding 071002 Peoples R China;

    Hebei Univ Coll Chem &

    Environm Sci Baoding 071002 Peoples R China;

    Hebei Univ Coll Chem &

    Environm Sci Baoding 071002 Peoples R China;

    Tianjin Univ Dept Chem Tianjin 300072 Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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