...
首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Electrocatalytic proton reduction catalysed by the low-valent tetrairon-oxo cluster [Fe-4(CO)(10)(kappa(2)-dppn)(mu(4)-O)](2-) [dppn=1,1 '- bis(diphenylphosphino)naphthalene]
【24h】

Electrocatalytic proton reduction catalysed by the low-valent tetrairon-oxo cluster [Fe-4(CO)(10)(kappa(2)-dppn)(mu(4)-O)](2-) [dppn=1,1 '- bis(diphenylphosphino)naphthalene]

机译:低价四铁-氧簇[Fe-4(CO)(10)(kappa(2)-dppn)(mu(4)-O)](2-)催化的电催化质子还原[dppn = 1,1 '-双(二苯基膦基)萘]

获取原文
获取原文并翻译 | 示例
           

摘要

The 62-electron oxo-capped tetrairon butterfly cluster, Fe-4(CO)(10)(kappa(2)-dppn)(mu(4)-O) (1) {dppn = 1,8-bis-(diphenylphosphino)naphthalene}, undergoes reversible one-electron oxidation and reduction events to generate the 61- and 63-electron radicals [Fe-4(CO)(10)(kappa(2)-dppn)(mu(4)-O)](+) (1(+)) and [Fe-4(CO)(10)(kappa(2)-dppn)(mu(4)-O)](-) (1(-)) respectively. Addition of a second electron affords the 64-electron cluster [Fe-4(CO)(10)(kappa(2)-dppn)(mu(4)-O)](2-) (1(2-)) which has more limited stability but is stable within the time frame of the electrochemical experiment. While 1 and 1(-) are inactive as proton reduction catalysts, dianionic 1(2-) is active for the formation of hydrogen from both CHCl2CO2H and CF3CO2H. This occurs via two separate mechanistic cycles branching at the mono-protonated species [Fe-4(CO)(10)(kappa(2)-dppn)(mu(4)-O)H](-) (1H(-)) resulting from the rapid protonation of 1(2-). This intermediate then undergoes competing protonation and reduction events leading to EECC and ECEC catalytic cycles respectively with 1(-) being pivotal to both. In order to understand the nature of [Fe-4(CO)(10)(kappa(2)-dppn)(mu(4)-O)](2-) (1(2-)) and its protonated products density functional theory (DFT) calculations have been employed. Theoretical calculations reveal that the cluster core remains intact in 1(2-), but the two consecutive one-electron reductions lead to an expansion of one of the trigonal-pyramids of this trigonal-bipyramidal cluster. The two-electron reduced cluster 1(2-) protonates at dppn-bound iron, accompanied by a wingtip-hinge iron-iron bond scission, and then reacts with a second proton to evolve hydrogen.
机译:62电子含氧封端的四铁蝴蝶簇Fe-4(CO)(10)(kappa(2)-dppn)(mu(4)-O)(1){dppn = 1,8-双-(二苯基膦基) }},经历可逆的单电子氧化和还原事件,以产生61和63电子自由基[Fe-4(CO)(10)(kappa(2)-dppn)(mu(4)-O)] (+)(1(+))和[Fe-4(CO)(10)(kappa(2)-dppn)(mu(4)-O)](-)(1(-))。添加第二个电子可得到64电子簇[Fe-4(CO)(10)(kappa(2)-dppn)(mu(4)-O)](2-)(1(2-))具有有限的稳定性,但是在电化学实验的时间内是稳定的。尽管1和1(-)不能作为质子还原催化剂,但双阴离子1(2-)对于从CHCl2CO2H和CF3CO2H生成氢具有活性。这是通过在单质子化物种[Fe-4(CO)(10)(kappa(2)-dppn)(mu(4)-O)H](-)(1H(-) )源自1(2-)的快速质子化。然后,该中间体经历竞争质子化和还原事件,分别导致EECC和ECEC催化循环,而1(-)则是两者的关键。为了了解[Fe-4(CO)(10)(kappa(2)-dppn)(mu(4)-O)](2-)(1(2-))的性质及其质子化产物密度功能理论(DFT)计算已被采用。理论计算表明,簇核在1(2-)中保持完好无损,但是连续两次单电子还原导致该三角-双锥体簇的三角锥体之一扩展。两电子还原簇1(2-)在与dppn结合的铁上质子化,并伴随翼尖-铰链铁-铁键断裂,然后与第二个质子反应生成氢。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号