首页> 外文期刊>Chemistry: A European journal >~7Li,~(31)P,and ~1H Pulsed Gradient Spin-Echo (PGSE) Diffusion NMR Spectroscopy and Ion Pairing:On the Temperature Dependence of the Ion Pairing in Li(CPh_3),Fluorenyllithium,and Li[N(SiMe_3)_2] amongst Other Salts
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~7Li,~(31)P,and ~1H Pulsed Gradient Spin-Echo (PGSE) Diffusion NMR Spectroscopy and Ion Pairing:On the Temperature Dependence of the Ion Pairing in Li(CPh_3),Fluorenyllithium,and Li[N(SiMe_3)_2] amongst Other Salts

机译:〜7Li,〜(31)P和〜1H脉冲梯度自旋回波(PGSE)扩散NMR光谱和离子对:Li(CPh_3),氟​​锂和Li [N(SiMe_3)中离子对的温度依赖性_2]等盐

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~7Li,~(31)P,and ~1H 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 carb-anions,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-l,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 lithimum 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 ~7Li 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:〜7Li,〜(31)P和〜1H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(例如卤化锂,碳负离子)的离子配对和聚集状态对于三苯甲基锂(2)和芴基锂(9),表明在299 K时有利于离子配对,但在155 K时离子被很好地分离。对于2-lithio-l,3-双硫杂环丁烷(13)和六甲基二硅氮烷锂(LiHMDS 16)的低温数据表明离子仍然存在。对于二硫阴离子13,已经建立了单核物种,而对于锂him酰胺16,PGSE结果允许两种不同的聚集对于THF中的卤化锂LiX(X = Br,Cl,I),〜7Li PGSE数据表明,这三种盐在环境温度下都可以描述为分离良好的离子。描述了三苯甲基锂(2),揭示了由[Li(thf)_4]〜+离子形成的溶剂分离离子对和裸露的三苯甲基阴离子。

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