首页> 外文期刊>Chemistry: A European journal >Li-7, P-31, and H-1 pulsed gradient spin-echo (PGSE) diffusion NMR spectroscopy and ion pairing: On the temperature dependence of the ion pairing in Li(CPh3), fluorenyllithium, and Li[N(SiMe3)(2)] amongst other salts
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Li-7, P-31, and H-1 pulsed gradient spin-echo (PGSE) diffusion NMR spectroscopy and ion pairing: On the temperature dependence of the ion pairing in Li(CPh3), fluorenyllithium, and Li[N(SiMe3)(2)] amongst other salts

机译:Li-7,P-31和H-1脉冲梯度自旋回波(PGSE)扩散NMR光谱学和离子对:关于Li(CPh3),芴基锂和Li [N(SiMe3)中离子对的温度依赖性(2)]和其他盐

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Li-7, P-31, and H-1 variable-temperature pulsed gradient spin-echo (PGSE) diffusion methods have been used to study ion pairing and aggregation states for a range of lithium salts such as lithium halides, lithium carbanions, and a lithium amide in THF solutions. For trityllithium (2) and fluorenyllithium, (9), it is shown that ion pairing is favored at 299 K but the ions are well separated at 155 K. For 2-lithio-1,3-dithiane (13) and lithium hexamethyldisilazane (LiHMDS 16), low-temperature data show that the ions remain together. For the dithio anion 13, a mononuclear species has been established, whereas for the lithium amide 16, the PGSE results allow two different aggregation states to be readily recognized. For the lithium halides LiX (X = Br, Cl, I) in THF, the Li-7 PGSE data show that all three salts can be described as well-separated ions at ambient temperature. The solid state structure of trityllithium (2) is described and reveals a solvent-separated ion pair formed by a [Li(thf)(4)](+) ion and a bare triphenylmethide anion.
机译:Li-7,P-31和H-1可变温度脉冲梯度自旋回波(PGSE)扩散方法已用于研究一系列锂盐(如卤化锂,锂碳负离子和THF溶液中的氨基酰胺锂。对于三苯甲基锂(2)和芴基锂(9),表明在299 K时有利于离子配对,但在155 K时离子分离良好。对于2-lithio-1,3-dithiane(13)和六甲基二硅氮烷锂( LiHMDS 16)的低温数据显示离子保持在一起。对于二硫阴离子13,已经建立了单核物质,而对于酰胺16锂,PGSE结果使得可以容易地识别出两种不同的聚集状态。对于THF中的卤化锂LiX(X = Br,Cl,I),Li-7 PGSE数据表明,在环境温度下,所有这三种盐都可以描述为分离良好的离子。描述了三苯甲基锂(2)的固态结构,揭示了由[Li(thf)(4)](+)离子和裸露的三苯甲基负离子形成的溶剂分离离子对。

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