dihydrobis(dimethylpyrazolyl)borate

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 唑类
• 英文名称: dihydrobis(dimethylpyrazolyl)borate
• 化学式: C₁₀H₁₆BN₄
• 分子量: 203.075
• InChiKey: RSEKGWMQEGHWPG-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  0.28
• 重原子数：
  15
• 可旋转键数：
  2
• 环数：
  2.0
• sp3杂化的碳原子比例：
  0.4
• 拓扑面积：
  23.8
• 氢给体数：
  0
• 氢受体数：
  2

反应信息

• 作为反应物：
  描述：

  氯化镝(III) 、 dihydrobis(dimethylpyrazolyl)borate 以 四氢呋喃 为溶剂， 以46%的产率得到Dy[H(μ-H)(dimethylpyrazolyl)2]3
  参考文献：
  名称：

  Dilution-Induced Slow Magnetic Relaxation and Anomalous Hysteresis in Trigonal Prismatic Dysprosium(III) and Uranium(III) Complexes

  摘要：

  Magnetically dilute samples of complexes Dy(H(2)BPz(2)(Me2))(3) (1) and U(H(2)BPz(2))(3) (3) were drepared through cocrystallization with diamagnetic Y(H(2)BPz(2)(Me2))(3) (2) and Y(H(2)BPz(2))(3). Alternating current (ac) susceptibility measurements performed on these samples reveal magnetic relaxation behavior drastically different from their concentrated counterparts. For concentrated 1, slow magnetic relaxation is not observed under zero or applied dc fields of several hundred Oersteds. However, a 1:65 (Dy:Y) molar dilution results in a nonzero out-of-phase component to the magnetic susceptibility under zero applied dc field, characteristic of a single-molecule magnet. The highest dilution of 3 (1:90, U:Y) yields a relaxation barrier U-eff = 16 cm(-1), double that of the concentrated sample. These combined results highlight the impact of intermolecular interactions in mononuclear single-molecule magnets possessing a highly anisotropic metal center. Finally, dilution elucidates the previously observed secondary relaxation process for concentrated 3. This process is slowed down drastically upon a 1:1 molar dilution, leading to butterfly magnetic hysteresis at temperatures as high as 3 K. The disappearance of this process for higher dilutions reveals it to be relaxation dictated by short-range intermolecular interactions, and it stands as the first direct example of an intermolecular relaxation process competing with single-molecule-based slow magnetic relaxation.

  DOI：

  10.1021/ic201078r