Effect of the chemical structure of a tetradentate equatorial ligand on the spin‐crossover properties of the Fe (III) complexes chain structures: Electron paramagnetic resonance study
作者:Olga A. Turanova、Elena N. Frolova、Linar G. Gafiyatullin、Leah V. Bazan、Alexander N. Turanov、Igor V. Ovchinnikov
DOI:10.1002/mrc.5223
日期:2022.2
(benzoylacetylacetone)2,2′-imine (bzacen) 3, and tvp = 1,2-di(4-pyridyl)ethylene, was studied by ultraviolet–visible (UV–vis) and electron paramagnetic resonance (EPR) methods. The values of exchange interactions, thermodynamic parameters of spin-crossover, and electronic structure features of the Fe (III) complexes were estimated from the EPR data. The substitution of a fragment of the equatorial ligand L in the series
赤道配体的化学结构对通式[Fe(L)(tvp)]BPh 4 ·nCH 3 OH的一系列一维链配合物中Fe(III)离子自旋态的影响,其中 L = 含有不同数量芳族基团的席夫碱的双阴离子:N , N '-亚乙基双(水杨醛亚胺) (salen) 1 , N , N '-亚乙基双 (乙酰丙酮)2,2'-亚胺 (acen) 2 , N , N'-亚乙基双(苯甲酰基乙酰丙酮)2,2'-亚胺(bzacen) 3, 和 tvp = 1,2-二(4-吡啶基)乙烯,通过紫外-可见 (UV-vis) 和电子顺磁共振 (EPR) 方法进行了研究。从 EPR 数据估计交换相互作用的值、自旋交叉的热力学参数和 Fe (III) 配合物的电子结构特征。在系列 salen-acen-bzacen 中赤道配体 L 的一个片段的取代改变了一维链中配合物的局部对称性,从而影响自旋变量性质。