Spin State in Homoleptic Iron(II) Terpyridine Complexes Influences Mixed Valency and Electrocatalytic CO<sub>2</sub> Reduction
作者:Simon Suhr、Nicolai Schröter、Merlin Kleoff、Nicolas Neuman、David Hunger、Robert Walter、Clemens Lücke、Felix Stein、Serhiy Demeshko、Hang Liu、Hans-Ulrich Reissig、Joris van Slageren、Biprajit Sarkar
DOI:10.1021/acs.inorgchem.3c00253
日期:2023.4.24
Two homoleptic Fe(II) complexes in different spin states bearing superbasic terpyridine derivatives as ligands are investigated to determine the relationship between spin state and electrochemical/spectroscopic behavior. Antiferromagnetic coupling between a ligand-centered radical and the high-spin metal center leads to an anodic shift of the first reduction potential and results in a species that
研究了两种以超碱性三联吡啶衍生物作为配体的不同自旋态的均配 Fe(II) 配合物,以确定自旋态与电化学/光谱行为之间的关系。以配体为中心的自由基与高自旋金属中心之间的反铁磁耦合导致第一还原电位的阳极偏移,并导致一种物质显示出具有中等强度间隔电荷转移带的混合价态。不同自旋态提供的差异扩展到配合物的电化学反应性:而低自旋物种是电催化 CO 2的预催化剂还原并导致以 37% 的法拉第效率优先形成 CO,高自旋物种仅以大约 20% 的适度法拉第效率催化质子还原。