| 141018-08-8

• 分子结构分类: 有机化合物 - 有机氧化合物
• CAS: 141018-08-8
• 化学式: C₆H₂₄Cr₂O₁₂
• 分子量: 392.241
• InChiKey: JDBIXEBLXKBYOZ-UHFFFAOYSA-L

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

• 作为反应物：
  描述：

  在 铬 作用下， 以 not given 为溶剂， 生成
  参考文献：
  名称：

  Preparation and reactivity of a cationic dichromium-semiquinone complex

  摘要：

  The complex described in the literature as the mu-oxo complex (H2O)5CrOCr(H2O)54+ is shown to be a dichromium(III)-semiquinone complex, (H2O)5CrOC6H4OCr(H2O)55+. It is prepared by the reaction of 1,4-benzoquinone with Cr2+ in acidic, aqueous solution. The reaction also yields Cr(H2O)63+ and a dichromium(III)-hydroquinone complex of 4+ charge. The semiquinone complex is reversibly reduced by outer-sphere electron transfer to the dichromium(III)-hydroquinone complex, (H2O)5CrOC6H4OCr(H2O)54+. This reduction is accomplished by any of Cr2+, Ru(NH3)62+, or V2+. The hydroquinone complex is reoxidized by Fe3+, 1,4-benzoquinone, Br2, or Ce(IV) to the semiquinone complex. Cyclic voltammograms obtained with either the hydroquinone complex or the semiquinone complex are identical and correspond to a reversible, one-electron process. The standard reduction potential of the semiquinone complex is +0.61 V (NHE). The semiquinone complex decomposes, over a period of hours, by aquation of Cr(III) followed by disproportionation of the organic ligand, yielding hydroquinone, benzoquinone, and Cr(H2O)63+. A literature report of the quinone oxidation of ethanol catalyzed by Cr3+ is reinterpreted as the reversible formation of a dichromium(III)-semiquinone radical complex.

  DOI：

  10.1021/ja00038a024
• 作为产物：
  描述：

  在 铁粉 作用下， 以 not given 为溶剂， 生成
  参考文献：
  名称：

  Preparation and reactivity of a cationic dichromium-semiquinone complex

  摘要：

  The complex described in the literature as the mu-oxo complex (H2O)5CrOCr(H2O)54+ is shown to be a dichromium(III)-semiquinone complex, (H2O)5CrOC6H4OCr(H2O)55+. It is prepared by the reaction of 1,4-benzoquinone with Cr2+ in acidic, aqueous solution. The reaction also yields Cr(H2O)63+ and a dichromium(III)-hydroquinone complex of 4+ charge. The semiquinone complex is reversibly reduced by outer-sphere electron transfer to the dichromium(III)-hydroquinone complex, (H2O)5CrOC6H4OCr(H2O)54+. This reduction is accomplished by any of Cr2+, Ru(NH3)62+, or V2+. The hydroquinone complex is reoxidized by Fe3+, 1,4-benzoquinone, Br2, or Ce(IV) to the semiquinone complex. Cyclic voltammograms obtained with either the hydroquinone complex or the semiquinone complex are identical and correspond to a reversible, one-electron process. The standard reduction potential of the semiquinone complex is +0.61 V (NHE). The semiquinone complex decomposes, over a period of hours, by aquation of Cr(III) followed by disproportionation of the organic ligand, yielding hydroquinone, benzoquinone, and Cr(H2O)63+. A literature report of the quinone oxidation of ethanol catalyzed by Cr3+ is reinterpreted as the reversible formation of a dichromium(III)-semiquinone radical complex.

  DOI：

  10.1021/ja00038a024