Iron(II) Complexes of Tridentate Indazolylpyridine Ligands: Enhanced Spin-Crossover Hysteresis and Ligand-Based Fluorescence
作者:Amedeo Santoro、Laurence J. Kershaw Cook、Rafal Kulmaczewski、Simon A. Barrett、Oscar Cespedes、Malcolm A. Halcrow
DOI:10.1021/ic502726q
日期:2015.1.20
complexes. Iron(II) complexes [Fe(1-bip)2]2+, [Fe(1,2-bip)2]2+, and [Fe(1-ipp)2]2+ are low-spin at room temperature, reflecting sterically imposed conformational rigidity of the 1-indazolyl ligands. In contrast, the 2-indazolyl complexes [Fe(2-bip)2]2+ and [Fe(2-ipp)2]2+ are high-spin in solution at room temperature, whereas salts of [Fe(2-bip)2]2+ exhibit thermal spin transitions in the solid state. Notably
2,6-二氟吡啶与2当量的吲唑和NaH在室温下反应,得到2,6-双(吲哚-1-基)吡啶(1-bip),2-(吲哚-1-基)-吡啶的混合物6-(吲哚-2-基)吡啶(1,2-bip)和2,6-双(吲哚-2-基)吡啶(2-bip),可通过溶剂萃取将其分离。在相同条件下进行两步操作,也可以得到2-(吲唑-1-基)-6-(吡唑-1-基)吡啶(1-ipp)和2-(吲唑-2-基)-6- (吡唑-1-基)吡啶(2-ipp)。这些都是2,6-二(吡唑-1-基)吡啶的退火类似物,2,6-二(吡唑-1-基)吡啶是自旋交联复合物的重要配体。铁(II)络合物[Fe(1-bip)2 ] 2 +,[Fe(1,2-bip)2 ] 2+和[Fe(1-ipp)2 ] 2+在室温下是低自旋的,反映了1-吲唑基配体的空间施加的构象刚度。相反,在室温下,2-吲唑基络合物[Fe(2-bip)2 ] 2+和[Fe(2-ipp)2 ]