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.
Goldberg, David P.
中科院分区:
化学2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.

文献摘要

参考文献

相似文献

在MnV(O)卟啉配合物中加入阴离子供体可显著增加2电子氧原子转移(OAT)化学反应。六配位[MnV(O)(TBP 8 Cz)(CN)]−是通过将Bu 4 N +CN−添加到五配位MnV(O)前体中产生的。首次用Mn K边X射线吸收光谱(XAS)对氰化物络合物进行了表征,得到Mn-O=1.53 μ mol/L,Mn-CN=2.21 μ mol/L。  结合计算研究,这些距离被证明与单重基态相关。CN−络合物与硫醚反应生成OAT,得到相应的亚砜和2 e −还原的MnIII(CN)−络合物。动力学测量显示,与母体5-配位复合物的相同反应相比,OAT的速率显着增强约24000倍。艾林分析给出ΔH =14 kcal mol−1,ΔS =−10 cal mol−1 K−1。  计算研究完全支持的结构,自旋状态,和相对反应性的5-和6-坐标MnV(O)的配合物。
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.
DOI: 10.1016/j.bbabio.2013.03.010
发表时间: 2013-08
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.
DOI: 10.1021/ja304609n
发表时间: 2012-06-27
影响因子: 15
作者:
Leeladee, Pannee;Baglia, Regina A.;Goldberg, David P.
通讯作者: Goldberg, David P.
DOI: 10.1002/chem.200901361
发表时间: 2009-01-01
影响因子: 4.3
作者:
Crestoni, Maria Elisa;Fornarini, Simonetta;Lanucara, Francesco
通讯作者: Lanucara, Francesco
DOI: 10.1021/ic1015274
发表时间: 2010-12-20
影响因子: 4.6
作者:
Jin, Ning;Lahaye, Dorothee E.;Groves, John T.
通讯作者: Groves, John T.
DOI: 10.1021/ja0761737
发表时间: 2007-10-17
影响因子: 15
作者:
Jin, Ning;Ibrahim, Mohammed;Groves, John T.
通讯作者: Groves, John T.