高等学校化学学报

高等学校化学学报

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单分子磁体[Mn4(CF3COO)4(hmp)6]的合成、晶体结构及磁学性质

那立艳1,2, 宁桂玲1, 张凤杰2, 王冰2   

    1. 大连理工大学化工学院, 大连 116022;
    2. 大连民族学院生命科学学院, 大连 116600
  • 收稿日期:2006-06-24 修回日期:1900-01-01 出版日期:2007-03-10 发布日期:2007-03-10
  • 通讯作者: 宁桂玲

Synthesis, Crystal Structure and Magnetic Properties of a Single-molecule Magnet [Mn4(CF3COO)4(hmp)6]

NA Li-Yan1,2, NING Gui-Ling1, ZHANG Feng-Jie2, WANG Bing2   

    1. School of Chemical Engineering, Dalian University of Technology, Dalian 116022, China;
    2. College of Life Science, Dalian Nationalities University, Dalian 116600, China
  • Received:2006-06-24 Revised:1900-01-01 Online:2007-03-10 Published:2007-03-10
  • Contact: NING Gui-Ling

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摘要： 以[Mn12O12(CF3COO)16(H2O)4]·2CF3COOH·4H2O和2-羟甲基吡啶(hmpH)为起始物, 在四氢呋喃溶液中合成了一种新的四核锰配合物[Mn4(CF3COO)4(hmp)6]. X射线单晶衍射结果表明, 该配合物属于单斜晶系, P21/c空间群, 晶胞参数a=1.3663(3) nm, b=1.4705(3) nm, c=1.4734(3) nm, β=98.51(3) °, V=2.9276 nm3, Z=2. 配合物中有两个CF3COO-基团与七配位Mn2中心相连, 其中一个为单齿配体, 另一个是双齿配体. 直流磁化率研究结果表明, 该配合物具有较高的自旋基态, 而交流磁化率依赖于外场频率变化极值的出现表明该配合物是一种单分子磁体.

关键词: 单分子磁体, 锰配合物, 合成, 晶体结构, 磁学性质

Abstract: The preparation, X-ray structure characterization and magnetic properties are presented for a new mixed-valence tetranuclear manganese complex that functions as a single-molecule magnet(SMM), [Mn4(CF3COO)4(hmp)6], where hmp- is the anion of 2-(hydroxymethyl) pyridine and is a N,O bidentate chelate. The compound crystallizes in the monoclinic system, space group P21/c(No.14) with unit cell parameters a=1.3663(3) nm, b=1.4705(3) nm, c=1.4734(3) nm, β=98.51(3)°, V=2.9276 nm3 and Z=2. The structure of the complex shows a novel coordination of the trifluoroacetate(TFA) anions, with one anion acting as a monodentate ligand while the second one coordinating through both oxygens to the same Mn centre. Direct current magnetic susceptibility measurement in the 2—300 K temperature range supports a high-spin ground state. The presence of a frequencey-dependent alternating current susceptibility signal indicates that the individual molecule is acting as the magnet.

Key words: Single-molecule magnet, Manganese complex, Synthesis, Crystal structure, Magnetic property

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