State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People's Republic of China.
Inorg Chem. 2012 Dec 17;51(24):13264-70. doi: 10.1021/ic301785v. Epub 2012 Dec 6.
The self-assembly of dysprosium(III) with the tailored chemical modification of the vanillin group affords two decorated Dy(3) compounds, namely, [Dy(3)(μ(3)-OH)(2)(Hpovh(-))(3)(NO(3))(3)(CH(3)OH)(2)H(2)O]·NO(3)·3CH(3)OH·2H(2)O (2) and [Dy(3)(μ(3)-OH)(2)(H(2)vovh(-))(3)Cl(2)(CH(3)OH)(H(2)O)(3)][Dy(3)(μ(3)-OH)(2)(H(2)vovh(-))(3)Cl(2)(H(2)O)(4)]·Cl(4)·2CH(3)OH·2CH(3)CN·7H(2)O (3), where H(2)povh = N-(pyridylmethylene)-o-vanilloylhydrazone and H(3)vovh = N-vanillidene-o-vanilloylhydrazone. Of particular interest is that those two title Dy(3) compounds maintain the peculiar vortex-spin structure of the ground nonmagnetic doublet. Complex 2 displays frequency-dependent slow magnetic relaxation, while 3 still inherits the single-molecule-magnet behavior as the parent Dy(3) prototype. The dissimilar dynamic magnetic behavior originates from the structural differences in light of the coordination environment of Dy(III) ions, which influence the local tensor of anisotropy and crystal-field splitting on each Dy site.
具有香草醛基团化学修饰的镝(III)的自组装提供了两种装饰的 Dy(3)化合物，即[Dy(3)(μ(3)-OH)(2)(Hpovh(-))(3)(NO(3))(3)(CH(3)OH)(2)H(2)O]·NO(3)·3CH(3)OH·2H(2)O(2)和[Dy(3)(μ(3)-OH)(2)(H(2)vovh(-))(3)Cl(2)(CH(3)OH)(H(2)O)(3)][Dy(3)(μ(3)-OH)(2)(H(2)vovh(-))(3)Cl(2)(H(2)O)(4)]·Cl(4)·2CH(3)OH·2CH(3)CN·7H(2)O(3)，其中 H(2)povh = N-(吡啶基亚甲基)-邻香草酰腙和 H(3)vovh = N-香草亚基邻香草酰腙。特别有趣的是，这两种标题 Dy(3)化合物保持了基态非磁性二重态的奇特涡旋自旋结构。配合物 2 显示出频率依赖性的缓慢磁弛豫，而 3 仍然继承了作为母体 Dy(3)原型的单分子磁体行为。不同的动态磁行为源于结构差异，这是考虑到 Dy(III)离子的配位环境，它影响每个 Dy 位点的局部各向异性张量和晶场分裂。
