| 1426854-40-1

• CAS: 1426854-40-1
• 化学式: C₂₂H₄₆As₂Cr₂Si₄
• 分子量: 676.784
• InChiKey: LMOJUFAZOQHILQ-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  None
• 重原子数：
  None
• 可旋转键数：
  None
• 环数：
  None
• sp3杂化的碳原子比例：
  None
• 拓扑面积：
  None
• 氢给体数：
  None
• 氢受体数：
  None

反应信息

• 作为产物：
  描述：

  双(环戊二烯)铬 、 lithium bis(trimethylsilyl)arsenide 以 甲苯 为溶剂， 以43%的产率得到
  参考文献：
  名称：

  Transmetalation of Chromocene by Lithium-Amide, -Phosphide, and -Arsenide Nucleophiles

  摘要：

  The pnictogen-centered nucleophiles LIE(SiMe3)(2) (E = N, P, or As) substitute a cyclopentadienide ligand of chromocene (Cp2Cr), with elimination of lithium cyclopentadienide, to give the series of pnictogen-bridged compounds [(mu:eta(2):eta(5)-Cp)Cr{mu-N(SiMe3)(2)}(2)Li] (1) and [(eta(5)-Cp)Cr{mu-E(SiMe3)(2)}](2), with E = P (2) or E = As (3). Whereas 1 is a heterobimetallic coordination polymer, 2 and 3 are homometallic dimers, with the differences being due to a structure-directing influence of the hard or soft character of the bridging group 15 atoms. For compound 1, the experimental magnetic susceptibility data were accurately reproduced by a single-ion model based on high-spin chromium(II) (S = 2), which gave a g-value of 1.93 and an axial zero-field splitting parameter of D = 1.83 cm(-1). Determinations of phosphorus- and arsenic-mediated magnetic exchange coupling constants, J, are rare: in the dimers 2 and 3, variable-temperature magnetic susceptibility measurements identified strong antiferromagnetic exchange between the chromium(II) centers, which was modeled using the spin Hamiltonian H = -2J (S-Cra.S-CrB), and produced large coupling constants of J = -166 cm(-1) for 2 and -77.5 cm(-1) for 3.

  DOI：

  10.1021/ic3025815