(2,2,2-trifluoroethoxy)bis(triisopropyl-l5-phosphaneyl)osmium(VI) hydride | 196714-84-8

• 分子结构分类: 有机化合物 - 苯类化合物 - 苯和取代衍生物
• 英文名称: (2,2,2-trifluoroethoxy)bis(triisopropyl-l5-phosphaneyl)osmium(VI) hydride
• CAS: 196714-84-8
• 化学式: C₂₀H₄₇F₃OOsP₂
• 分子量: 612.735
• InChiKey: NUSKEEUERKDVQR-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  7.61
• 重原子数：
  27.0
• 可旋转键数：
  10.0
• 环数：
  0.0
• sp3杂化的碳原子比例：
  1.0
• 拓扑面积：
  9.23
• 氢给体数：
  0.0
• 氢受体数：
  1.0

反应信息

• 作为产物：
  描述：

  bis(triisopropylphosphane)(dihydrido)dichloroosmium(IV) 在 (C₂H₅)3N 作用下， 生成 (2,2,2-trifluoroethoxy)bis(triisopropyl-l5-phosphaneyl)osmium(VI) hydride
  参考文献：
  名称：

  Quantum Exchange Coupling:  A Hypersensitive Indicator of Weak Interactions

  摘要：

  Os(H)(3)ClL2 (L = (PPr3)-Pr-i) forms a 1:1 adduct with L' = PEt3, NH3, MeCN, acetone, methanol, and THF. The case L' = PEt3 permits the dearest identification of adduct structure as pentagonal bipyramidal. For NH3 and MeCN, the respective kinetics of L' loss are measured as Delta H-double dagger = 20.7(3) and 17.6(3) kcal/mol and Delta S-double dagger = 16(1) and 14.7(9) cal/(mol K). For acetone, methanol, and THF, the following respective Delta H degrees and Delta S degrees values for L' binding are measured: Delta H degrees = -10.4(1), -6.66(8), and -5.8(2) kcal/mol; Delta S degrees = -41.8(5), -25.5(3), and -33(1) cal/(mol K). Decoalesced H-1 NMR spectra are reported for several of these Os(H)(3)ClL2L' species, and they show a variety of examples of quantum exchange coupling among the hydride ligands. The values of J(e)x are higher when L' is a more weakly-binding ligand. The quantum exchange coupling constants of Os(H)(3)XL2 (X = Cl, Br, I, OCH2CF3, OCH(CF3)(2)) in CD2Cl2, in toluene, and in methylcyclohexane show an unprecedented decrease of J with increasing temperature, which is attributed to weak formation of Os(H)(3)Cl(solvent)L-2 adducts at low temperature. For L' = CO, adduct formation leads to liberation of coordinated H-2. Excess L' = MeCN or NH3 slowly leads to formation of [Os(H)(3)L'L-2(2)]Cl; the X-ray structure for L' = NH3 is reported. Crystal data (-171 degrees C): a = 11.561(4) Angstrom, b = 14.215(5) Angstrom, c = 8.851(3) Angstrom, alpha = 97.51(2)degrees, beta = 107.73(2)degrees, gamma = 104.47(2)degrees, with Z = 2 in space group . The potential energy was calculated for exchange of 2H of OsH3X(PH3)(2)L (X = Cl with L = no ligand and PH3, X = I with L = no ligand) using effective core potential ab initio methods at the MP2 level. The site exchange is found to be energetically easier for Cl than for I, in agreement with experiment. The hydride site exchange in the seven-coordinate species OsH3Cl(PH3)(3) (a model for coordination of either ligand or solvent to Os) is found to be easier than that in the 16-electron species. No dihydrogen ligand is located on the reaction path for site exchange. The current theory which relates quantum exchange to a tunneling effect was used for calculating J(ex) as a function of temperature. The dynamic study was done using several sets of coordinates, in particular the rotation angle phi and the internuclear distance r between the exchanging H. The vibrational levels have been calculated and the symmetry of each level assigned within the permutation group in order to determine the nature of the nuclear spin function associated with each level. It is found that the rotation, phi, gives rise to the largest tunneling effect but that r cannot be neglected. The influence of the temperature, J(ex)(T), was included by a Boltzmann distribution. The results are in qualitative agreement with experiment in that quantum exchange coupling is larger in the case of Cl than in the case of I. Additional ligand L increases the value of the quantum exchange coupling mostly by lowering the activation energy for pairwise exchange.

  DOI：

  10.1021/ja970603j