ITQB NOVA, Instituto de Tecnologia Química e Biológica António Xavier, Av. da República, 2780-157 Oeiras, Portugal.
LAQV-REQUIMTE, Department of Chemistry, Campus de Caparica, NOVA School of Science and Technology, NOVA University Lisbon, 2829-516 Caparica, Portugal.
Molecules. 2021 Oct 20;26(21):6325. doi: 10.3390/molecules26216325.
A series of new -[Mn(L)(CO)Br] complexes where L is a bidentate chelating ligand containing mixed mesoionic triazolylidene-pyridine (MIC^py, ), triazolylidene-triazole (MIC^trz, ), and triazole-pyridine (trz^py, ) ligands have been prepared and fully characterized, including the single crystal X-ray diffraction studies of and . The abilities of - and complex -[Mn(MIC^MIC)(CO)Br] () to catalyze the electroreduction of CO has been assessed for the first time. It was found that all complexes displayed a current increase under CO atmosphere, being and the most active complexes. Complex , bearing a N^N-based ligand exhibited a good efficiency and an excellent selectivity for reducing CO to CO in the presence of 1.0 M of water, at low overpotential. Interestingly, complex containing the strongly electron donating di-imidazolylidene ligand exhibited comparable activity to , when the experiments were performed in neat acetonitrile at slightly higher overpotential (-1.86 vs. -2.14 V).
一系列新型的[Mn(L)(CO)Br]配合物已经被制备并进行了全面的表征，其中 L 是一种双齿螯合配体，含有混合的介孔三唑并吡啶（MIC^py）、三唑并三唑（MIC^trz）和三唑吡啶（trz^py）配体。其中和的单晶 X 射线衍射研究也已经完成。首次评估了 -和复合物 -[Mn(MIC^MIC)(CO)Br]（）对 CO 电还原的催化能力。结果发现，所有配合物在 CO 气氛下都显示出电流增加，其中和是最活跃的配合物。而含有 N^N 配体的配合物 ，在 1.0 M 水存在下，表现出良好的效率和对 CO 还原为 CO 的优异选择性，在低过电势下。有趣的是，当在纯乙腈中、在略高的过电势（-1.86 对 -2.14 V）下进行实验时，含有强给电子二咪唑啉配体的配合物 表现出与 相当的活性。
