Photoassistance in Reactions of the <i>cis</i>- (Bis(2,2‘-bipyridyl))(carbonyl)(formyl)ruthenium(II) Cation with Protic Reagents
作者:Dorothy H. Gibson、Yan Ding、Bradley A. Sleadd、Jaime O. Franco、John F. Richardson、Mark S. Mashuta
DOI:10.1021/ja962168j
日期:1996.1.1
the recent report of the synthesis of cis-Ru(bpy)sub 2} (CO)(CHO)sup +}PFsub 6}sup-} (1; bpy = 2,2`-bipyridyl) by Tanaka et al., we had also synthesized the compound and begun a study of its reactions. We now describe our observations on the unusual reactions of 1 and suggest explanations for these reactions. Our results with 1 suggest that the photoactivity of Csub 1} complexes in this series
Stabilization of [Ru(bpy)2(CO)(η1-CO2)] and unprecedented reversible oxide transfer reactions from CO32− to [Ru(bpy)2(CO)2]2+ and from [Ru(bpy)2(CO)(η1-CO2)] to CO2
作者:H Nakajima
DOI:10.1016/s0022-328x(98)00774-8
日期:1998.10.30
Unusual thermal stability of [Ru(bpy)(2)(CO)(eta(1)-CO2)] (1) as a metal-eta(1)-CO2 complex was examined both in solid state and in solution. Compound 1 dissolves in CH3CN containing LICF3SO3. Interaction between Li+ and the eta(1)-CO2 group enhances an electron flow from Ru to the CO2 ligand and greatly contributes to the stabilization of the Ru-eta(1)-CO2 bond. The reaction of [Ru(bpy)(2)(CO)(2)](PF6)(2) with [Crown.K](2)CO3 in dry CH3CN selectively produced 1 through the 1:1 adduct with the RuC(O)-OCO2 moiety. Stoichimetric formation of 1 from the 1:1 adduct is also assisted by [Crown.K](+) as a Lewis acid. Similarly, the reaction of [Ru(bpy)(2)(CO)(2)](PF6)(2) with (Me4N)(2)CO3 in DMSO gave the 1:1 adduct in the initial stage, which gradually changed to a metalloanhydride complex, [Ru(bpy),(CO)((CO)(2)O)] due to the absence of Lewis acids to stabilize 1, since an addition of LiCF3SO3 to the solution gave [Ru(bpy)(2)(CO)(eta(1)-CO2)] quantitatively. (C) 1998 Elsevier Science S.A. All rights reserved.
作者:Tanaka, Hiroaki、Tzeng, Biing-Chiau、Nagao, Hirotaka、Peng, Shie-Ming、Tanaka, Koji
DOI:——
日期:——
Reduction of CO<sub>2</sub>Directed toward Carbon–Carbon Bond Formation
作者:Koji Tanaka
DOI:10.1246/bcsj.71.17
日期:1998.1
electrochemical reduction of CO2 directed toward carbon–carbonbondformation via metal–CO2 adducts. An electrophilic attack of CO2 to penta-coordinated low valent polypyridyl Ru complexes affords a Ru–η1-CO2 adduct, which is easily converted to Ru–CO species either by an acid-base equilibrium in protic media and oxide transfer to CO2 under aprotic conditions. Two-electron reduction of resultant Ru–CO
本文描述了通过金属-CO2 加合物直接形成碳-碳键的 CO2 电化学还原。CO2对五配位低价多吡啶Ru配合物的亲电攻击提供了Ru-η1-CO2加合物,通过质子介质中的酸碱平衡和在非质子条件下氧化物转移到CO2,它很容易转化为Ru-CO物种. 质子溶液中所得 Ru-CO 的双电子还原竞争性地导致 Ru-CO 键断裂(CO 析出)并形成热不稳定的 Ru-CHO 键。除了将后者进一步还原为 Ru-CH2OH 作为 CH3OH 和 HOOCCH2OH 的前体之外,Ru-CHO 与 CO2 反应生成 HCOOH,并再生 Ru-CO 作为 CO 的前体。因此,在质子溶液中多电子还原 CO2 的困难归因于 Ru-CHO 的热不稳定性和强氢化物供体特性。另一方面,在 (CH3)4N+ 或 CH3I 的非质子条件下,Ru-CO 的双电子还原会产生...