Dramatic influence of an anionic donor on the oxygen-atom transfer reactivity of a Mn(V) -oxo complex.
Dramatic influence of an anionic donor on the oxygen-atom transfer reactivity of a Mn(V) -oxo complex.
复制标题
DOI:
10.1002/chem.201404349
复制
发表时间:
2014-11-03
影响因子:
4.3
通讯作者:
Goldberg, David P.
中科院分区:
文献类型:
--
作者:
Neu, Heather M.;Quesne, Matthew G.;Yang, Tzuhsiung;Prokop-Prigge, Katharine A.;Lancaster, Kyle M.;Donohoe, James;DeBeer, Serena;de Visser, Sam P.;Goldberg, David P.
Addition of an anionic donor to an MnV(O) porphyrinoid complex causes a dramatic increase in 2-electron oxygen-atom-transfer (OAT) chemistry. The 6-coordinate [MnV(O)(TBP8Cz)(CN)]− was generated from addition of Bu4N+CN− to the 5-coordinate MnV(O) precursor. The cyanide-ligated complex was characterized for the first time by Mn K-edge X-ray absorption spectroscopy (XAS) and gives Mn–O=1.53 Å, Mn–CN=2.21 Å. In combination with computational studies these distances were shown to correlate with a singlet ground state. Reaction of the CN− complex with thioethers results in OAT to give the corresponding sulfoxide and a 2e−-reduced MnIII(CN)− complex. Kinetic measurements reveal a dramatic rate enhancement for OAT of approximately 24 000-fold versus the same reaction for the parent 5-coordinate complex. An Eyring analysis gives ΔH≠=14 kcal mol−1, ΔS≠=−10 cal mol−1 K−1. Computational studies fully support the structures, spin states, and relative reactivity of the 5- and 6-coordinate MnV(O) complexes.
登录
查看更多内容
影响因子:
4.3
作者:
Bewley, Kathryn D.;Ellis, Katie E.;Firer-Sherwood, Mackenzie A.;Elliott, Sean J.
通讯作者:
Elliott, Sean J.
影响因子:
15
作者:
Leeladee, Pannee;Baglia, Regina A.;Goldberg, David P.
通讯作者:
Goldberg, David P.
影响因子:
4.3
作者:
Crestoni, Maria Elisa;Fornarini, Simonetta;Lanucara, Francesco
通讯作者:
Lanucara, Francesco
影响因子:
4.6
作者:
Jin, Ning;Lahaye, Dorothee E.;Groves, John T.
通讯作者:
Groves, John T.
影响因子:
15
作者:
Jin, Ning;Ibrahim, Mohammed;Groves, John T.
通讯作者:
Groves, John T.