Albert-Ludwigs-Universität Freiburg, Institut für Anorganische und Allgemeine Chemie, Freiburg Institute of Advanced Studies (FRIAS), Albertstr., 21, D-79104, Freiburg, Germany.
Dalton Trans. 2011 Aug 28;40(32):8114-24. doi: 10.1039/c1dt10722d. Epub 2011 Jul 18.
The fast, high yield synthesis and full characterization of Na[B(hfip)(4)] (hfip: OC(H)(CF(3))(2)) from NaBH(4) and hexafluoroisopropanol (hfipH) is presented. By anion metathesis, five B(hfip)(4) salts with classical/functionalized ionic liquid (IL) cations with melting points between 0 (C(6)MIMB(hfip)(4)) and 113 °C (C(4)MMorphB(hfip)(4)) were prepared. Four of these qualify as ILs and one as room temperature IL (RTIL). The properties of the borate anion B(hfip)(4) and its aluminum analogue Al(hfip)(4) were compared based on the available structural information from XRD. Viscosities (10.3 (90 °C) to 855 (0 °C) mPa s(-1)) and conductivities (0.603 (30 °C) to 4.844 (90 °C) mS cm(-1)) were measured between 0 and 90 °C, and described by the Vogel-Fulcher-Tammann (VFT) equations. The properties of the B(hfip)(4) ILs were analyzed in the context of the anion-dependent molecular volume V(m)-viscosity-/conductivity-correlations, also in comparison to ILs with BF(4)/PF(6), N(CN)(2), Tf(2)N and Al(hfip)(4) counterions. The viscosities and conductivities of B(hfip)(4) ILs are slightly inferior to Al(hfip)(4) ILs, similar to/better than all other anions given above. According to the Walden plots, the ionicity of the B(hfip)(4) ILs may at least be classified as "good". By sharp contrast to the Al(hfip)(4) ILs, the B(hfip)(4) ILs have good stability against humidity/water. Thus, handling of B(hfip)(4) ILs in an open laboratory atmosphere over hours and days is allowed and further facilitates the use of this new IL class.
从 NaBH4 和六氟异丙醇（hfipH）快速、高产合成并全谱表征了 Na[B(hfip)(4)]（hfip：OC(H)(CF3)(2)）。通过阴离子交换反应，制备了五个具有熔点在 0（C6MIMB(hfip)(4)）至 113°C(C4MMorphB(hfip)(4)）之间的经典/功能化离子液体（IL）阳离子的B(hfip)(4)盐。其中四种为离子液体，一种为室温离子液体（RTIL）。基于 XRD 提供的可用结构信息，比较了硼酸盐阴离子B(hfip)(4)及其铝类似物Al(hfip)(4)的性质。在 0 至 90°C 之间测量了粘度（10.3（90°C）至 855（0°C）mPa s(-1)）和电导率（0.603（30°C）至 4.844（90°C）mS cm(-1)），并通过 Vogel-Fulcher-Tammann（VFT）方程进行了描述。在阴离子依赖性分子体积 V(m)-粘度/电导率相关的背景下分析了B(hfip)(4)离子液体的性质，也与具有BF4、PF6、N(CN)2、Tf2N和Al(hfip)(4)抗衡离子的离子液体进行了比较。B(hfip)(4)离子液体的粘度和电导率略低于Al(hfip)(4)离子液体，与上述所有其他阴离子相似/更好。根据 Walden 图，B(hfip)(4)离子液体的离子性至少可归类为“良好”。与Al(hfip)(4)离子液体形成鲜明对比的是，B(hfip)(4)离子液体对湿度/水具有良好的稳定性。因此，允许在开放的实验室环境中处理B(hfip)(4)离子液体数小时和数天，这进一步促进了这种新型离子液体的使用。
