Barbero Alice, Rotundo Laura, Reviglio Chiara, Gobetto Roberto, Sokolova Romana, Fiedler Jan, Nervi Carlo
Department of Chemistry, University of Torino, Via P. Giuria 7, 10125 Torino, Italy.
CIRCC (Interuniversitary Consortium of Chemical Reactivity and Catalysis), Via Celso Ulpiani 27, 70126 Bari, Italy.
Molecules. 2023 Nov 10;28(22):7535. doi: 10.3390/molecules28227535.
This study aimed to demonstrate the behavior of different complexes using IR spectroelectrochemistry (SEC), a technique that combines IR spectroscopy with electrochemistry. Four different Mn and Re catalysts for electrochemical CO reduction were studied in dry acetonitrile. In the case of Mn(apbpy)(CO)Br (apbpy = 4(4-aminophenyl)-2,2'-bipyridine), SEC suggested that a very slow catalytic reduction of CO also occurs in acetonitrile in the absence of proton donors, but at rather negative potentials. In contrast, the corresponding Re(apbpy)(CO)Br clearly demonstrated slow catalytic conversion at the first reduction potential. Switching to saturated CO solutions in a mixture of acetonitrile and 5% water as a proton donor, the SEC of Mn(apbpy)(CO)Br displayed a faster catalytic behavior.
本研究旨在利用红外光谱电化学（SEC）这一将红外光谱与电化学相结合的技术，来展示不同配合物的行为。在干燥乙腈中研究了四种用于电化学CO还原的不同锰和铼催化剂。对于Mn(apbpy)(CO)Br（apbpy = 4(4-氨基苯基)-2,2'-联吡啶），红外光谱电化学表明，在没有质子供体的情况下，乙腈中也会发生非常缓慢的CO催化还原反应，但电位相当负。相比之下，相应的Re(apbpy)(CO)Br在首次还原电位时明显表现出缓慢的催化转化。切换到以乙腈和5%水的混合物作为质子供体的饱和CO溶液中，Mn(apbpy)(CO)Br的红外光谱电化学显示出更快的催化行为。
