Structures and Spin States of Iron(II) Complexes of Isomeric 2,6-Di(1,2,3-triazolyl)pyridine Ligands
作者:Izar Capel Berdiell、Daniel J. Davies、Jack Woodworth、Rafal Kulmaczewski、Oscar Cespedes、Malcolm A. Halcrow
DOI:10.1021/acs.inorgchem.1c02404
日期:2021.10.4
[Fe(L3)2][ClO4]2 are low-spin and diamagnetic in the solid state and in solution, while [Fe(L2)2][ClO4]2 and [Co(L3)2][BF4]2 are fully high-spin. Treatment of L3 with methyl iodide affords 2,6-di(2-methyl-1,2,3-triazol-4-yl)pyridine (L4) and 2-(1-methyl-1,2,3-triazol-4-yl)-6-(2-methyl-1,2,3-triazol-4-yl)pyridine (L5). While salts of [Fe(L5)2]2+ are low-spin in the solid state, [Fe(L4)2][ClO4]2·H2O is high-spin
2,6-二(1,2,3-三唑-1-基)吡啶(L 1 )的铁(II)络盐在未干燥溶剂中出乎意料地不稳定。这是通过[Fe(L 1 ) 4 (H 2 O) 2 ][ClO 4 ] 2和[Fe(NCS) 2 (L 1 ) 2 (H 2 O) 2 ]·L 1 的分离来解释的,其中含有L 1作为单齿配体而不是以预期的三齿方式结合。这些配合物通过O-H···N氢键结合成4 4网格结构;相关4 4协调框架的溶剂化物,还提供了catena -[Cu(μ-L 1 ) 2 (H 2 O) 2 ][BF 4 ] 2。异构配体 2,6-二(1,2,3-三唑-2-基)吡啶 (L 2 ) 和 2,6-二(1 H -1,2,3-三唑-4-基)吡啶 ( L 3 ) 以更典型的三齿方式与铁(II) 结合。[Fe(L 3 ) 2 ][ClO 4 ] 2 的溶剂化物在固态和溶液中是低自旋和抗磁性的,而 [Fe(L 2 ) 2 ][ClO