| 448958-95-0

• CAS: 448958-95-0
• 化学式: C₂₁H₃₀OSm
• 分子量: 448.829
• InChiKey: WDUQVUBGMSEKFE-UHFFFAOYSA-N

反应信息

• 作为产物：
  描述：

  samarocene 、 一氧化碳 以 甲基环己烷 为溶剂， 生成
  参考文献：
  名称：

  Solution Infrared Spectroscopic Studies on Equilibrium Reactions of CO with the Decamethylmetallocenes Cp*₂M^II, Where M^II = Mg, Ca, Sr, Ba, Sm, Eu, Yb

  摘要：

  The reaction of CO with the alkaline-earth decamethylmetallocenes CP*M-2(II), where M-II is Mg, Ca, Sr, or Ba, and the bivalent lanthanide decamethylmetallocenes, where M-II is Sm, Eu, or Yb, have been studied in toluene or methylcyclohexane solution in a high-pressure infrared cell. In all cases, except for Mg and Ba, the monocarbonyl complex Cp*2MCO is observed to form under CO pressure. The CO stretching frequencies for CP*2CaCO (2158 cm(-1)), CP*2SrCO (2159 cm(-1)), CP*2SmCO (2153 cm(-1)), and CP*2EuCO (2150 cm(-1)) are greater than that of free CO (2134 cm(-1) in toluene or methylcyclohexane). In contrast, CP*2YbCO has nu(CO) 2114 cm(-1), below that of free CO. This 1:1 complex is formed at low CO pressure (<2 bar); at higher CO pressures the 1:2 adduct Cp*Yb-2(CO)2 with an even lower nu(CO) value of 2072 cm(-1) predominates. Equilibrium constants were determined as a function of pressure and temperature for the equilibria Cp*M-2(II)(solv) + nCO(gas or solv) reversible arrow Cp*M-2(II)(CO)(n)(solv), with M-II = Ca, Eu, Yb. The thermodynamic constants Delta H degrees, Delta S degrees, and Delta G degrees for the formation of each species, extracted from the changes in the intensity of the corresponding IR absorption bands, indicate weak M-II-CO binding. Models to account for the bonding in these metallocene CO adducts are discussed.

  DOI：

  10.1021/om011045r