Effect of Distortions on the Geometric and Electronic Structures of One-Electron Oxidized Vanadium(IV), Copper(II), and Cobalt(II)/(III) Salen Complexes
作者:Hussein Kanso、Ryan M. Clarke、Amélie Kochem、Himanshu Arora、Christian Philouze、Olivier Jarjayes、Tim Storr、Fabrice Thomas
DOI:10.1021/acs.inorgchem.0c00381
日期:2020.4.6
3-propanediamine were chelated to V(IV)═O (1, 2), Cu(II) (3, 4), Co(II) (5), and Co(III) (6). The X-ray crystal structures of 1–6 were solved. The vanadium center in 1–2 resides in square pyramidal geometry, with an axially bound oxo ligand, whereas the metal ion displays a tetrahedrally distorted square planar geometry in 3–5. The extent of distortion is correlated to the length of the diamine spacer:
配体N,N′-双(3-叔丁基-5-甲氧基水杨亚基)-1,2-乙二胺和N,N′-双(3-叔丁基-5-甲氧基水杨亚基)-1,3-丙二胺为螯合到V(IV)= O(1,2),铜(II)(3,4),钴(II)(5),和Co(III)(6)。的X射线晶体结构1 - 6就解决了。钒中心为1 – 2,呈方形金字塔形,带有轴向键合的氧代配体,而金属离子呈3 –形,呈四面形扭曲的正方形平面几何形状5。畸变的程度与二胺间隔基的长度相关:接头越长,四面体畸变越大。配合物6是八面体,带有乙酸二齿乙酸酯分子,可完成配位球的形成。所有复合物的特征在于紫外可见光谱和EPR光谱,以及DFT计算和电化学。配合物1 - 6表现出的范围内-0.11-0.26相对于Fc的可逆单电子氧化波+ / Fc的。阳离子1 +和2 +进行了结构表征,显示了一个八面体V(V)离子,其中一个氧代和一个水分子在轴向位置上协调。他们的vis-NIR光谱分别由727和815