| 双核镍(Ⅱ)配合物的合成、晶体结构和磁性质 |
| Synthesis, Crystal Structure and Magnetic Properties of Dinuclear Nickel(Ⅱ) Complex |
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| 摘要: 合成了通过N-N键桥联的不对称的N2O3席夫碱配体(H3L)的镍(Ⅱ)配合物[Ni2(HL)2]2(DMF)8(H2O)2 (1)。配合物晶体属于三斜晶系，空间群为P1，a=1.273 5(2) nm，b=1.360 4(3) nm，c=1.427 6(3) nm，α=85.358(4)°，β=63.513(3)°，γ=79.545(4)°，V=2.176 8(7) nm3，Z=1，F(000)=980，R1=0.073 6。配合物1的不对称单元中含有两个双核结构Ni2(HL)2(DMF)2(H2O)2 (Ⅰ)和Ni2(HL)2(DMF)4 (Ⅱ)以及两个DMF溶剂分子。通过酚基氧原子桥联的镍-镍距离分别为：Ni(1)-Ni(1A)，0.308 4 nm；Ni(2)-Ni(2B)，0.310 3 nm(对称操作：A：1-x，2-y，-z；B：1-x，1-y，1-z)。金属镍(Ⅱ)离子采取扭曲的八面体配位构型，一个配体的NO2三齿配位单元和另一个配体的酚基氧原子位于赤道面位置，两个溶剂分子占据轴向位置。晶体中存在着分子内以及分子与溶剂分子间的两种氢键作用。配合物1的变温磁化率测定表明，Ni(Ⅱ)离子之间的反铁磁耦合作用在它的磁性质中起主导作用。 |
| 关键词: 席夫碱 镍(Ⅱ)配合物 晶体结构 磁性质 |
| 基金项目: |
| Abstract: Asymmetrical pentadentate Schiff-base ligand H3L with two coordination compartments linked by a single N-N bridge and its nickel(Ⅱ) complex [Ni2(HL)2]2(DMF)8(H2O)2 (1) have been synthesized. Crystal data: triclinic, space group P1, a=1.273 5(2) nm, b=1.360 4(3) nm, c=1.427 6(3) nm, α=85.358(4)°, β=63.513(3)°, γ=79.545(4)°, V=2.176 8(7) nm3, Z=1, F(000)=980, R1=0.073 6 for 5 475 observed reflections [I≥2σ(I)]. An asymmetric unit of complex 1 comprises two binuclear structures Ni2(HL)2(DMF)2(H2O)2 (Ⅰ) and Ni2(HL)2(DMF)4 (Ⅱ) and two DMF solvent molecules. The separations of phenol oxygen bridged nickel(Ⅱ) centers Ni(1)-Ni(1A) and Ni(2)-Ni(2B) are 0.308 4 and 0.310 3 nm, respectively (symmetry code: A: 1-x, 2-y, -z; B: 1-x, 1-y, 1-z). The metal centers in the distorted octahedral geometries were coordinated by a NO2 tridentate moiety from one ligand, a phenyl oxygen atom from another ligand and two oxygen atoms of different solvent molecules. There are two type hydrogen bonds in the crystal. The magnetic behavior of complex 1 indicates that the antiferromagnetic exchange coupling between Ni(Ⅱ) ions dominates the magnetic properties of the complex. CCDC: 273546. |
| Keywords: Schiff-base nickel(Ⅱ) complex crystal structure magnetic properties |
| 投稿时间：2005-04-01 修订日期：2005-06-16 |
| 摘要点击次数: 1237 |
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| 柏,党东宾,段春迎.双核镍(Ⅱ)配合物的合成、晶体结构和磁性质[J].无机化学学报,2005,21(8):1155-1159. |
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