离子液体热分解机理的原位变温多核核磁共振研究
发布时间:2018-12-07 16:51
【摘要】:利用原位变温核磁共振氢谱(~1H NMR)、核磁共振氟谱(~(19)F NMR)和核磁共振磷谱(~(31)P NMR)等NMR技术研究特定温度下离子液体的热分解机理.在温度低至80℃时,1-丁基-3-甲基咪唑阳离子(C4mim~+)和六氟磷酸根阴离子(PF6~—)组成的离子液体[C4mim][PF_6]呈现1个缓慢但明显的分解过程.无水[C_4mim][PF_6]在温度高于80℃时开始分解,生成少量的五氟化磷(PF_5)和氟化氢(HF),氟化氢中的氢原子来自于1-丁基-3-甲基咪唑环2位上的氢原子.在丢掉这个氢原子后,阳离子成环形成一个卡宾,并与PF5形成卡宾/PF5复合物.定量NMR分析显示在分解反应达到平衡状态时,自由态PF5和卡宾/PF5复合物的比例为7∶3.
[Abstract]:The thermal decomposition mechanism of ionic liquids at specific temperature was studied by in situ nuclear magnetic resonance (1H NMR),) fluorine (19) F NMR) and phosphorus NMR (31) P NMR) NMR techniques. When the temperature is as low as 80 鈩,
本文编号:2367492
[Abstract]:The thermal decomposition mechanism of ionic liquids at specific temperature was studied by in situ nuclear magnetic resonance (1H NMR),) fluorine (19) F NMR) and phosphorus NMR (31) P NMR) NMR techniques. When the temperature is as low as 80 鈩,
本文编号:2367492
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