(diphenylmethane){Cr(CO)2}2(μ-tetramethylphosphino) | 135107-12-9

• 英文名称: (diphenylmethane){Cr(CO)2}2(μ-tetramethylphosphino)
• CAS: 135107-12-9
• 化学式: C₂₁H₂₄Cr₂O₄P₂
• 分子量: 506.359
• InChiKey: XNVLLEDPAQZTMM-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
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• 重原子数：
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• 可旋转键数：
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• 环数：
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• sp3杂化的碳原子比例：
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• 拓扑面积：
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• 氢给体数：
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• 氢受体数：
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反应信息

• 作为产物：
  描述：

  [η(6)-PhCr(CO)3]2CH2 、 1,1,2,2-四甲基-二膦 以 苯 为溶剂， 以8%的产率得到(diphenylmethane){Cr(CO)2}2(μ-tetramethylphosphino)
  参考文献：
  名称：

  Class II mixed-valent complexes from oxidation of doubly linked (arene)chromium compounds

  摘要：

  Oxidation of bridged d6-d6 dinuclear (arene)chromium complexes having a second linkage of P2Me4 has been studied by electrochemistry and by IR and ESR spectroscopies. Cyclic voltammetry shows that both (biphenyl)[Cr(CO)2]2(mu-P2Me4) (VII) and (diphenylmethane)[Cr(CO)2]2(mu-P2Me4) (VIII) undergo two separate reversible one-electron oxidations in CH2Cl2, with E-degree's (vs SCE) of +0.32 and +0.69 V (for VII) and +0.23 and +0.52 V (for VIII). A third complex, (diphenylmethane)[Cr(CO)3]2, has a two-electron oxidation wave for which wave-shape analysis yields E-degrees values of +0.845 and +0.890 V. The monocations of VII and VIII were studied at 263 K by IR spectroscopy and shown to have separate Cr(I) and Cr(0) sites. A similar conclusion was drawn from the frozen-solution ESR spectrum of VIII+. These ion are formulated as class II mixed-valent species in the Robin-Day classification scheme. The IR spectrum of {(biphenyl)[Cr(CO)2PPh3]2}+ was reinvestigated (see ref 16) at 203 K, and a spectrum similar to those of VII+ and VIII+ was obtained. All three class II mixed-valent cations showed carbonyl IR shifts for the Cr(0) site in the range 11-20 cm-1 as compared with the neutral starting materials. The structures of VII and VIII were crystallographically determined. For VII, crystal data are as follows: C20H22Cr2O4P2, monoclinic, P2(1)/n, a = 13.489 (4) angstrom, b = 11.800 (3) angstrom, c = 13.726 (3) angstrom, beta = 107.22 (3)-degrees, V = 2086.79 (11) angstrom 3, Z = 4, R(F) = 4.09%. The biphenyl ligand is twisted 25.7-degrees to accommodate the gauche conformation of the tetramethyldiphosphine group. A large Cr-Cr separation [4.773 (1) angstrom] appears to preclude a strong metal-metal interaction. For VIII, crystal data are as follows: C21H24Cr2O4P2, monoclinic, C2/c, a = 14.580 (3) angstrom, b = 10.359 (3) angstrom, c = 14.705 (4) angstrom, beta = 108.56 (2)-degrees, V = 2165 (1) angstrom 3, Z = 4, R(F) = 2.90%.

  DOI：

  10.1021/om00053a051