当前位置: X-MOL 学术Chem. Sci. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Scrutinizing formally NiIV centers through the lenses of core spectroscopy, molecular orbital theory, and valence bond theory
Chemical Science ( IF 7.6 ) Pub Date : 2023-06-09 , DOI: 10.1039/d3sc02001k
Ida M DiMucci 1 , Charles J Titus 2 , Dennis Nordlund 3 , James R Bour 4 , Eugene Chong 4 , Dylan P Grigas 1 , Chi-Herng Hu 5 , Mikhail D Kosobokov 6 , Caleb D Martin 7 , Liviu M Mirica 5 , Noel Nebra 8 , David A Vicic 6 , Lydia L Yorks 6 , Sam Yruegas 7 , Samantha N MacMillan 1 , Jason Shearer 9 , Kyle M Lancaster 1
Affiliation  

Nickel K- and L2,3-edge X-ray absorption spectra (XAS) are discussed for 16 complexes and complex ions with nickel centers spanning a range of formal oxidation states from II to IV. K-edge XAS alone is shown to be an ambiguous metric of physical oxidation state for these Ni complexes. Meanwhile, L2,3-edge XAS reveals that the physical d-counts of the formally NiIV compounds measured lie well above the d6 count implied by the oxidation state formalism. The generality of this phenomenon is explored computationally by scrutinizing 8 additional complexes. The extreme case of NiF62− is considered using high-level molecular orbital approaches as well as advanced valence bond methods. The emergent electronic structure picture reveals that even highly electronegative F-donors are incapable of supporting a physical d6 NiIV center. The reactivity of NiIV complexes is then discussed, highlighting the dominant role of the ligands in this chemistry over that of the metal centers.

中文翻译:


通过核心光谱学、分子轨道理论和价键理论的视角正式审视 NiIV 中心



讨论了镍中心跨越 II 至 IV 一系列形式氧化态的 16 种络合物和络合物离子的镍 K 和 L 2,3边 X 射线吸收光谱 (XAS)。单独的 K 边 XAS 被证明是这些 Ni 配合物物理氧化态的模糊度量。同时,L 2,3 -边XAS揭示了测量的形式Ni IV化合物的物理d计数远高于氧化态形式所暗示的d 6计数。通过仔细检查另外 8 个复合体,通过计算探索了这种现象的普遍性。 NiF 6 2−的极端情况是使用高级分子轨道方法以及先进的价键方法来考虑的。新出现的电子结构图表明,即使是高负电性的 F 供体也无法支持物理 d 6 Ni IV中心。然后讨论了 Ni IV配合物的反应性,强调了配体在该化学中相对于金属中心的主导作用。
更新日期:2023-06-09
down
wechat
bug