A family of mesothermal ionic liquids comprised of tetraarylphosphonium cations and the bis(trifluoromethanesulfonyl)amidate anion are shown to be materials of exceptional thermal stability, enduring (without decomposition) heating in air at 300 °C for three months. It is further established that three specific structural elements – phenoxy, phenacyl, and phenyl sulfonyl – can be present in the cation structures without compromising their thermal stability, and that their incorporation has specific impacts on the melting points of the salts. Most importantly, it is shown that the ability of such a structural component to lower a salt melting point is tied to its ability to lower cation–cation repulsions in the material.

中文翻译：

---

结构改性对一系列基于四芳基-的中温离子液体的热稳定性，熔点和离子相互作用的影响

由四芳基phosph阳离子和双（三氟甲磺酰基）酰胺酸根阴离子组成的中等热离子液体被证明是具有出色的热稳定性的材料，可在空气中于300°C的温度下承受（不分解）加热三个月。进一步确定的是，阳离子结构中可以存在三种特定的结构元素-苯氧基，苯甲酰基和苯基磺酰基-而不损害其热稳定性，并且它们的掺入对盐的熔点有特定的影响。最重要的是，表明这种结构组分降低盐熔点的能力与其降低材料中阳离子-阳离子排斥力的能力有关。