Prabhu Sugosh R, Dutt G B
J Phys Chem B. 2015 May 21;119(20):6311-6. doi: 10.1021/acs.jpcb.5b02853. Epub 2015 May 7.
Rotational diffusion of two structurally similar nondipolar solutes, 2,5-dimethyl-1,4-dioxo-3,6-diphenylpyrrolo[3,4-c]pyrrole (DMDPP) and 1,4-dioxo-3,6-diphenylpyrrolo[3,4-c]pyrrole (DPP), has been examined in ethylammonium nitrate-lithium nitrate (EAN-LiNO3) mixtures to understand the influence of added electrolyte on the local environment experienced by the solute molecules. The measured reorientation times of both DMDPP and DPP in EAN-LiNO3 mixtures fall within the broad limits set by the hydrodynamic slip and stick boundary conditions. The hydrogen bond accepting DMDPP and the hydrogen bond donating DPP experience specific interactions with the cation and anion of the ionic liquid, respectively. Addition of LiNO3 (0.1 and 0.2 mole fraction) to EAN induces only viscosity related effects on the rotational diffusion of the two nondipolar solutes. These observations suggest that the local environment experienced by DMDPP and DPP in EAN is not altered upon the addition of LiNO3. Our results are consistent with the structural details available in the literature for EAN-LiNO3 mixtures.
为了了解添加电解质对溶质分子所处局部环境的影响，研究了两种结构相似的非偶极溶质2,5 - 二甲基 - 1,4 - 二氧代 - 3,6 - 二苯基吡咯并[3,4 - c]吡咯（DMDPP）和1,4 - 二氧代 - 3,6 - 二苯基吡咯并[3,4 - c]吡咯（DPP）在硝酸乙铵 - 硝酸锂（EAN - LiNO₃）混合物中的旋转扩散。在EAN - LiNO₃混合物中测得的DMDPP和DPP的重取向时间落在由流体动力学滑移和黏附边界条件设定的宽泛范围内。氢键接受体DMDPP和氢键供体DPP分别与离子液体的阳离子和阴离子发生特定相互作用。向EAN中添加LiNO₃（0.1和0.2摩尔分数）仅对两种非偶极溶质的旋转扩散产生与粘度相关的影响。这些观察结果表明，添加LiNO₃后，EAN中DMDPP和DPP所处的局部环境没有改变。我们的结果与文献中关于EAN - LiNO₃混合物的结构细节一致。
