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New Low-Melting Triply Charged Homoleptic Cr(III)-Based Ionic Liquids in Comparison to Their Singly Charged Heteroleptic Analogues

机译:新的低熔点与其单电荷的异常类似物相比基于离子液体的基于离子液体

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摘要

A series of new low-melting triply charged homoleptic Cr(III)-based ionic liquids of the general formula (RMIm)3[Cr(NCS)6] (R = methyl, ethyl, n-butyl, benzyl) is reported. Their syntheses and properties are described in comparison to their singly charged heteroleptic analogues of the general formula (RMIm)[Cr(NCS)4L2] (R = methyl, ethyl, n-butyl, benzyl; L = pyridine, γ-picoline). In total, sixteen new Reineckate related salts with large imidazolium cations are described. Out of these, five compounds were crystallized, and their structures determined by single-crystal X-ray structure analyses. They all consisted of discrete anions and cations with octahedrally coordinated Cr(III) ions. In the structures, various hydrogen contacts interconnect the entities to build up hydrogen bonded networks. Thermal investigations showed relatively low melting points for the homoleptic complexes. The compounds with the [Cr(NCS)6]3− anion melt without decomposition and are stable up to 200 K above their melting points. The complex salts with the [Cr(NCS)4L2]− anion, in contrast, start to decompose and lose L molecules (Pyr or Pic) already at the melting point.
机译:报道了一系列新的低熔点电荷的聚类Cr(III)的通式(RMIM)3 [Cr(NCS)6](R =甲基,乙基,正丁基,正丁基,苄基)的基于离子液体。与它们的通式(RMIM)[Cr(NCS)4L2](R =甲基,乙基,正丁基,苄基; L =吡啶,γ-吡啶)相比描述它们的合成和性质。总共有16个新的Regeckate相关盐,具有大型咪唑鎓阳离子。除此之外,五种化合物被结晶,并通过单晶X射线结构分析确定它们的结构。它们都是由八面积协调的Cr(III)离子的离散阴离子和阳离子组成。在结构中,各种氢触点将实体互连以构建氢键网络。热调查显示出杂交复合物的熔点相对较低。具有[Cr(NCS)6] 3-阴离子熔体的化合物而无需分解,稳定在其熔点上至200k。与[Cr(NCS)4L2] - 阴离子相比,复合物盐开始分解并丢失已经在熔点处的L分子(Pyr或Pic)。

著录项

  • 期刊名称 Materials
  • 作者

    Tim Peppel; Martin Köckerling;

  • 作者单位
  • 年(卷),期 2021(14),10
  • 年度 2021
  • 页码 2676
  • 总页数 14
  • 原文格式 PDF
  • 正文语种
  • 中图分类 外科学;
  • 关键词

    机译:铬;离子液体;晶体结构;物理性质;熔点;

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