The dynamics, orientational anisotropy, diffusivity, viscosity, and density were measured for concentrated lithium salt solutions, including lithium chloride (LiCl), lithium bromide (LiBr), lithium nitrite (LiNO₂), and lithium nitrate (LiNO₃), with methyl thiocyanate as an infrared vibrational probe molecule, using two-dimensional infrared spectroscopy (2D IR), nuclear magnetic resonance (NMR) spectroscopy, and viscometry. The 2D IR, NMR, and viscosity results show that LiNO₂ exhibits longer correlation times, lower diffusivity, and nearly 4 times greater viscosity compared to those of the other lithium salt solutions of the same concentration, suggesting that nitrite anions may strongly facilitate structure formation via strengthening water–ion network interactions, directly impacting bulk solution properties at sufficiently high concentrations. Additionally, the LiNO₂ and LiNO₃ solutions show significantly weakened chemical interactions between the lithium cations and the methyl thiocyanate when compared with those of the lithium halide salts.

中文翻译：

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阴离子对浓水锂离子动力学的影响

测量了浓锂盐溶液的动力学、取向各向异性、扩散率、粘度和密度，包括氯化锂 (LiCl)、溴化锂 (LiBr)、亚硝酸锂 (LiNO ₂ ) 和硝酸锂 (LiNO ₃ )，其中甲基使用二维红外光谱 (2D IR)、核磁共振 (NMR) 光谱和粘度测定法，将硫氰酸盐作为红外振动探针分子。 2D IR、NMR 和粘度结果表明，与相同浓度的其他锂盐溶液相比， LiNO ₂表现出更长的相关时间、更低的扩散率和近 4 倍的粘度，表明亚硝酸根阴离子可能强烈促进结构形成通过加强水-离子网络相互作用，在足够高的浓度下直接影响本体溶液的性质。此外，与卤化锂盐相比，LiNO ₂和LiNO ₃溶液显示出锂阳离子和硫氰酸甲酯之间的化学相互作用显着减弱。