Halogen photoreductive elimination from gold(III) centers.

Halogen photoreductive elimination from gold(III) centers.
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金 (III) 中心的卤素光还原消除。

DOI:
10.1021/ja9009937
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发表时间:
2009
影响因子:
15
通讯作者:
D. Nocera
D. Nocera
中科院分区:
化学1区
文献类型:
--
作者:
Thomas S. Teets;D. Nocera

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Au(III)(PR(3))X(3) 类型的单体配合物和 Au(2)(I,III)[mu-CH(2)(R(2)P)(2)]X(4) 和 Au(2)(III,III)[mu-CH(2)(R(2)P)(2)]X(6) 类型的双金属配合物(R = Ph, Cy, X = Cl(-), Br(-))容易发生光消除卤素。在存在烯烃化学陷阱的情况下,通过 LMCT 激发 Au(III) 配合物溶液,可实现 M-X 键活化和卤素消除。与 LMCT 光化学的典型单电子氧化还原转化相反,Au(III) 中心的 LMCT 光化学允许前所未有的 (i) 来自单体中心的 X(2) 的双电子光消除和 (ii) 来自双金属中心的 X(2) 的四电子光消除。一般来说,所有物种的 X(2) 光产生的量子产率在 10% 到 20% 之间,显示出对金配体特性或络合物核的依赖性极小。在没有化学陷阱的情况下观察到有效的 X(2) 光消除,提供了从过渡金属中心真正、无陷阱消除卤素的罕见例子。
Monomeric complexes of the type Au(III)(PR(3))X(3) and bimetallic complexes of the type Au(2)(I,III)[mu-CH(2)(R(2)P)(2)]X(4) and Au(2)(III,III)[mu-CH(2)(R(2)P)(2)]X(6) (R = Ph, Cy, X = Cl(-), Br(-)) undergo facile photoelimination of halogen. M-X bond activation and halogen elimination is achieved upon LMCT excitation of solutions of Au(III) complexes in the presence of olefin chemical traps. As opposed to the typical one-electron redox transformations of LMCT photochemistry, the LMCT photochemistry of the Au(III) centers allows for the unprecedented (i) two-electron photoelimination of X(2) from a monomeric center and (ii) four-electron photoelimination of X(2) from a bimetalllic center. The quantum yields for X(2) photoproduction, in general, are between 10% and 20% for all species, showing only minimal dependence on the identity of the ligands about gold, or the nuclearity of the complex. Efficient X(2) photoelimination is observed in the absence of a chemical trap, providing a rare example of authentic, trap-free halogen elimination from a transition metal center.
DOI: 10.1126/science.1162018
发表时间: 2008-08-22
期刊: SCIENCE
影响因子: 56.9
作者:
Kanan, Matthew W.;Nocera, Daniel G.
通讯作者: Nocera, Daniel G.