mono(pentakis(methylamino)chromium(VIII)) monobromide | 75953-25-2

• 分子结构分类: 无机化合物 - 混合金属/非金属化合物
• 英文名称: mono(pentakis(methylamino)chromium(VIII)) monobromide
• CAS: 75953-25-2
• 化学式: C₅H₂₅BrCrN₅
• 分子量: 287.187
• InChiKey: ZGRPPJRVKQAFIQ-UHFFFAOYSA-M

计算性质

• 辛醇/水分配系数(LogP)：
  None
• 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：

  Cr(methylamine)6(3+) 在 HBr 、 NaBr 、 NH₂CH₃/HBr buffer 作用下， 以 水 为溶剂， 生成 mono(pentakis(methylamino)chromium(VIII)) monobromide
  参考文献：
  名称：

  Shevchenko, Yu. N.; Satok, V. V.; Davidenko, N. K., Russian Journal of Inorganic Chemistry, 1979, vol. 24, p. 1475 - 1481

  摘要：

  DOI：

文献信息

• Steric effects on the substitution of pentaamine-chromium(III) and -rhodium(III) complexes. Anation reaction rate constants as an indicative of the dissociative shift of the mechanism on crowding the [M(RNH2)5H2O]3+ (M = Rh, R = H, Me, Et, Pr; M = Cr, R = H, Me, Pr) complexes
  作者：Gabriel González、Manuel Martinez

  DOI：10.1016/0020-1693(94)04192-x

  日期：1995.3

  The kinetics of the anation reactions of [M(RNH(2))(5)H2O](3+) (M=Rh, R=H, Me, Et, Pr; M=Cr, R=H, Me, Pr) with several ligands (H3PO4/H2PO4-, H3PO3/H2PO3-, CF3COO-, Br-, Cl-, SCN-) have been studied at different temperatures and acidities at I=1.0 M (LiClO4). Results obtained for the anation rate constants and thermal activation parameters are compared with the previously published data for R=H, in order to establish the effects of the amine substituents in the reaction mechanism proposed for the substitution reactions of these complexes. The results obtained are interpreted on the basis of a mechanism where the bond formation process is more important in the substitution on M=Cr complexes than in that of the M=Rh complexes, as already pointed out for the published Delta V-not equal values for the water exchange on these systems. A simple Langford-Gray classification becomes inadequate to describe these situations where the increase of the steric demand of the amine substituents shifts the I-a-I-d classification to the I-d side, although no dramatic changes in the reaction mechanism are found. It is concluded that a More O'Ferrall 'continuous' type of approach to the mechanism classification of the substitution reactions is much more useful in this case.