A nickel dithiolene complex substituted with crown ether cyclic moieties incorporating four O atoms, abbreviated as [Ni(S2O4)2]1−,0, is isolated in its radical anionic (as Na+ salt) and neutral forms. The Na+ cation is six-coordinated with short Na⋯O distances (2.46–2.52 Å), involving two crown ether moieties of two different complexes. The oxidized neutral complex [Ni(S2O4)2]0 was also isolated and structurally characterized. In the absence of alkaline cations during the synthesis, a mixed salt associating [Ni(S2O4)2]1− with Ni2+ was isolated, and formulated as (Ni,H2O)[Ni(S2O4)2]2, with the Ni2+ cation weakly bonded to two crown ether moieties. The salt exhibits an unprecedented solid state association with extremely short S⋯S intermolecular contacts [3.332(2) Å], leading to a pairing of the radical [Ni(S2O4)2]− into antiferromagnetic uniform spin chains.
一种由包含四个 O 原子的
冠醚环分子取代的二
硫代二亚
硫基
镍络合物(简称为 [Ni(S2O4)2]1-,0)以其根阴离子(作为 Na+ 盐)和中性形式被分离出来。Na+ 阳离子为六配位,Na⋯O 间距较短(2.46-2.52 Å),涉及两个不同络合物的两个
冠醚分子。此外,还分离出了氧化中性络合物 [Ni(S2O4)2]0,并确定了其结构特征。在合成过程中没有碱性阳离子的情况下,分离出了[Ni(S2O4)2]1- 与 Ni2+ 结合的混合盐,并配制成 (Ni,
H2O)[Ni(S2O4)2]2,其中 Ni2+ 阳离子与两个
冠醚分子呈弱结合。这种盐呈现出前所未有的固态关联,分子间的 S⋯S 接触[3.332(2) Å]极短,导致基团[Ni(S2O4)2]-配对成反
铁磁性的均匀自旋链。