Mn2(μ-H)(μ-PCyMe)(CO)8 | 169697-95-4

• 英文名称: Mn2(μ-H)(μ-PCyMe)(CO)8
• CAS: 169697-95-4
• 化学式: C₁₅H₁₅Mn₂O₈P
• 分子量: 464.129
• InChiKey: DQATUXQHAQVHHY-UHFFFAOYSA-N

反应信息

• 作为产物：
  描述：

  Li[Mn2(μ-PCyH)(CO)8] 、 碘甲烷 以 四氢呋喃 为溶剂， 生成 Mn2(μ-H)(μ-PCyMe)(CO)8
  参考文献：
  名称：

  Reactivity of Deprotonated Mn2(.mu.-H)(.mu.-PCyH)(CO)8: Selective Monoauration to Mn2(.mu.-AuPR3)(.mu.-PCyH)(CO)8 and Mn2(.mu.-H)(.mu.3-PCy(AuPR3))(CO)8 (R = Cy, Ph, p-C6H4F, p-C6H4OMe) and Kinetic Studies of their Conversion

  摘要：

  In THF solution the dimanganese complex Mn-2(mu-H)(mu-PCyH)(CO)(8) (1) reacts with equimolar amounts of the non nucleophilic base DBU (1.8-diazabicyclo[5.4.0]undec-7-en) and ClAuPR(3) (R = Cy, Ph, p-C(6)H(4)OMe, p-C6H4F) at 20 degrees C within 1 h to afford the following mono- and diaurated pairs of isomers: Mn-2 mu-AuPR(3)(mu-PCyH)(CO)(8) (A) and Mn-2(mu-H)(mu(3)-PCy(AuPR(3)))(CO)(8) (B); Mn-2(mu-AuPR(3))(mu-PCy(AuPR(3)))(CO)(8) and Mn-2(AuPR(3))(2)(mu(4)-PCy)(CO)(8). Whereas we described the separated components of the last named pair in our previous publication, the monoaurated isomers are dicussed in this paper. These isomers have now been separated by a fractional crystallization procedure and identified by means of H-1 NMR, P-31 NMR, UV/vis, and v(CO) IR spectroscopic measurements. In the case of R = Ph, Mn-2(mu-AuPPh(3))(mu-PCyH)(CO)(8) (2) and Mn-2(mu-H)(mu(3)-PCY(AuPPh(3)))(CO)(8) (3) both crystallize triclinic, space group P ($) over bar 1, Z = 2: 2, a = 10.687(2) Angstrom, b = 11.605(2) Angstrom, c = 14.369(2) Angstrom, alpha = 103.91(1)degrees, beta = 99.85(1)Angstrom, gamma = 93.97(1)degrees; 3, a = 12.741(1) A, b = 16.371(1)degrees Angstrom, c = = 9.068(2)degrees Angstrom, alpha = 97.85(1)degrees, beta = 110.73(1)degrees; gamma = 74.99(1)degrees. Both molecular structures show a common edge-sharing coordination bioctahedron with an orthogonal Mn-Mn bond. Proceeding from 1, the mu-H atom is replaced by the isolobal group AuPPh(3) to obtain 2 on the one hand, and on the other hand, the phosphorus bound H atom is exchanged by the same group to get 3. The Mn-Mn bond length is 3.136(2) Angstrom in 2 and 2.927(1) Angstrom in 3. In solution, A and B form a dynamic equilibrium whose displacement depends on the R groups and on the solvent used. A mechanistic pathway for the formation of 2 and 3 is proposed. In connection with this the anion [Mn-2(mu-PCyH)(CO)(8)](-) 1a is described which was obtained as the salt Li[1a] (yield 81%) by the reaction of PhLi and 1 in THF solution. Finally, the kinetic data for the mutual conversion of the isomer pairs A and B were obtained by UV/vis measurements in different solvents (n-hexane, CH2Cl2) at selected temperatures. The influence of solvent interactions and of electronic factors of the R groups (M, I effect) on the rate constants and the steady states, respectively, is discussed.

  DOI：

  10.1021/ic00126a015