Two bis(dithiolato)nickel salts with different flexible ammonium counterions, [Et₃MeN][Ni(dmit)₂] (1) and [(i-Bu)Et₃N][Ni(dmit)₂] (2) (dmit²⁻ = 2-thioxo-1,3-dithiole-4,5-dithiolate, Et₃MeN⁺ = triethylmethylammonium, (i-Bu)Et₃N⁺ = triethylisobutylammonium), are prepared and identified by powder X-ray diffraction (PXRD) patterns and single-crystal X-ray diffraction. Salt 1 crystallizes in the triclinic space group P − 1 at 293 K. The anions and cations in 1 form alternating layered arrangements along the a-axis direction. Salt 2 belongs to the monoclinic crystal system and space group P2₁/n. The anions and cations in 2 form separate columnar stacks along bc-plane direction. The neighboring anions are stacked as dimers in the anion columnar stacks of 2. The magnetic features of salts 1 and 2 show 1D alternating spin chain magnetic exchange behavior, and the magnetic experimental data are well fitted through a spin chain magnetic model. The difference in the crystal structures and magnetic properties between the two new salts 1 and 2 fully demonstrates that the magnetic properties are dependent on the alignment of the [Ni(dmit)₂]⁻ anions, which are related to the flexible organic cations.

Graphical abstract

中文翻译：

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两种具有柔性有机阳离子的双（二硫代乳酸）镍盐的晶体结构和磁性特征的研究

两种具有不同柔性铵抗衡离子的双（二硫代巯基）镍盐[Et ₃ MeN] [Ni（dmit）₂ ]（1）和[（i-Bu）Et ₃ N] [Ni（dmit）₂ ]（2）（ DMIT ^2-  = 2-硫代-1,3-二硫-4,5-二硫醇，等_3周的MeN ⁺  =三乙基甲基，（I-卜）的Et ₃ ñ ⁺  = triethylisobutylammonium），制备并通过粉末X射线衍射鉴定（PXRD）图案和单晶X射线衍射。盐1结晶在三斜晶系空间群P 在293 K. 1所述的阴离子和阳离子- 1沿a轴方向形成交替的分层排列。盐2属于单斜晶系，空间群P 2 ₁ / n。在阴离子和阳离子2沿着形式单独柱状叠层BC-面内方向。相邻的阴离子作为二聚体堆叠在2的阴离子柱状堆栈中。盐1和2的磁性特征表现出一维交替的自旋链磁性交换行为，并且通过自旋链磁性模型很好地拟合了磁性实验数据。两种新盐1和1之间的晶体结构和磁性能的差异图2充分证明了磁性质取决于与柔性有机阳离子有关的[Ni（dmit）₂ ] ^-阴离子的排列。

图形概要