Bulk nanostructure of the prototypical ‘good’ and ‘poor’ solvate ionic liquids [Li(G4)][TFSI] and [Li(G4)][NO<sub>3</sub>]
作者:Thomas Murphy、Sam K. Callear、Nageshwar Yepuri、Karina Shimizu、Masayoshi Watanabe、José N. Canongia Lopes、Tamim Darwish、Gregory G. Warr、Rob Atkin
DOI:10.1039/c6cp00176a
日期:——
mixture of lithium bis(trifluoromethylsulfonyl)imide (Li[TFSI]) in tetraglyme (G4), denoted [Li(G4)][TFSI], and the poor SIL formed from a 1 : 1 mixture of lithium nitrate (Li[NO3]) in G4, denoted [Li(G4)][NO3], have been studied. In both SILs there are strong Lewis acid–base interactions between Li+ and ligating O atoms. However, the O atoms coordinated to Li+ depend strongly on the counter anion present
使用中子衍射和经验电势结构优化(EPSR)模拟拟合,对原型的“良好”溶剂化物离子液体(SIL)和“不良” SIL的整体纳米结构进行了检查。良好的SIL由双(三氟甲基磺酰基)酰亚胺锂(Li [TFSI])在四甘醇二甲醚(G4)中的1:1混合物形成,表示为[Li(G4)] [TFSI],而较差的SIL由1:1形成研究了硝酸锂(Li [NO 3 ])在G4中的混合物,表示为[Li(G4)] [NO 3 ]。在两种SIL中,Li +和连接的O原子之间都有很强的路易斯酸碱相互作用。但是,与Li +配位的O原子强烈依赖于存在的抗衡阴离子。[Li(G4)] [TFSI]与G4的LiGO配位数比[Li(G4)] [NO]高2-3倍3 ],相反,[⋯(G4)] [NO 3 ]的Li⋯O阴离子配位数高2-3倍。在这两个溶剂化物中,Li围绕G4 O原子的局部堆积是相同的,但是这些相互作用在[Li(G4)] [NO